Impact Definition and 956 Threads

An impact event is a collision between astronomical objects causing measurable effects. Impact events have physical consequences and have been found to regularly occur in planetary systems, though the most frequent involve asteroids, comets or meteoroids and have minimal effect. When large objects impact terrestrial planets such as the Earth, there can be significant physical and biospheric consequences, though atmospheres mitigate many surface impacts through atmospheric entry. Impact craters and structures are dominant landforms on many of the Solar System's solid objects and present the strongest empirical evidence for their frequency and scale.
Impact events appear to have played a significant role in the evolution of the Solar System since its formation. Major impact events have significantly shaped Earth's history, and have been implicated in the formation of the Earth–Moon system, the evolutionary history of life, the origin of water on Earth and several mass extinctions. The prehistoric Chicxulub impact, 66 million years ago, is believed to be the cause of the Cretaceous–Paleogene extinction event.Throughout recorded history, hundreds of Earth impacts (and exploding bolides) have been reported, with some occurrences causing deaths, injuries, property damage, or other significant localised consequences. One of the best-known recorded events in modern times was the Tunguska event, which occurred in Siberia, Russia, in 1908. The 2013 Chelyabinsk meteor event is the only known such incident in modern times to result in numerous injuries. Its meteor is the largest recorded object to have encountered the Earth since the Tunguska event.
The Comet Shoemaker–Levy 9 impact provided the first direct observation of an extraterrestrial collision of Solar System objects, when the comet broke apart and collided with Jupiter in July 1994. An extrasolar impact was observed in 2013, when a massive terrestrial planet impact was detected around the star ID8 in the star cluster NGC 2547 by NASA's Spitzer space telescope and confirmed by ground observations. Impact events have been a plot and background element in science fiction.
In April 2018, the B612 Foundation reported "It’s 100 percent certain we’ll be hit [by a devastating asteroid], but we’re not 100 percent certain when." Also in 2018, physicist Stephen Hawking, in his final book Brief Answers to the Big Questions, considered an asteroid collision to be the biggest threat to the planet. In June 2018, the US National Science and Technology Council warned that America is unprepared for an asteroid impact event, and has developed and released the "National Near-Earth Object Preparedness Strategy Action Plan" to better prepare. According to expert testimony in the United States Congress in 2013, NASA would require at least five years of preparation before a mission to intercept an asteroid could be launched.

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  1. T

    Velocity of a slider immediately before impact

    T1 + V1 = T2 + V2 0 + mAgh = 0.5mAV2A1 + 0 40 = (5/32.2)VA2 VA1 = 16.0499 ft/s Edit: Accidentally Used two notations for Kinetic Energy in the "Useful equations" section. Changed it to correctly notate Kinetic and Potential. This notation is used in R.C. Hibbeler Dynamics 14th Ed.
  2. J

    Replacing ATV Trail Bridges: Cat 259D Skid Steer Impact

    A local ATV (All Terrain Vehicle) trail has some bridges over wetlands. The original supplier of the wood decking did not properly pressure treat the wood, so several of the bridges are being replaced. One bridge had the decking replaced last year. The contractor replacing the other bridges...
  3. Badgun

    Impact of several variables on resulting projectile motion trajectory

    I was told to generate these variables (m, C, alpha, wind velocity) normally distributed and compare the random data with the result and then tell, which of the variables has the most impact. Here I am stuck, tried to compare variances, kurtosis and skewness of the data (the original variables...
  4. Emilyyyyyyyyy

    Calculate the impact force when falling from a height

    To find vx vx = dx/t = 3.86 m/1.5 s= 2.573 m/s To find Ek Ek = ½mvx²= ½(79.4)(2.573)²= 262.8 J W = FnetΔd Fnet = 262.8 J/ 3.86 m = 68 N He hits him with a force of 68N
  5. FEAnalyst

    Impact force in the Charpy test

    Hi, could you tell me how to calculate approximate value of impact force during Charpy test (pendulum hitting sample) ? The only formulas that can be found in literature for this test are maximum velocity ##v=\sqrt{2gh}## and work done for fracture ##K=mgR(cos \beta - cos \alpha)##. But it...
  6. Semidevilz

    I How to determine an impact based on components

    I feel this is an easy arithmetic, but I can’t figure out how to get it to work out. Let’s say I have an overall metric of sales data that can be broken down by 5 sales reps. In 2016, each rep makes a certain number of phone calls and their success rate is # of sales divided by # of calls...
  7. T

    Detrimental impact of magnetic field on PCB and battery?

    Hi there, we are developing a small consumer electronics product consisting of a small 4-layer PCB along with a few PDM microphones and BLE chip/ and antenna, as well as a LiPo battery. We are locating a small but pretty strong magnet next to these components in the enclosure. It is an N52...
  8. Mlesnita Daniel

    B Previous thoughts on destroying asteroids were wrong: Nuking them is a bad idea

    This study from Johns Hopkins University shows that even if we manage to nuke an asteroid and "destroy" it, it will have a core back, in almost 2 hours. Nuking them was a bad idea before, but now seems worse. More details here...
  9. fluidistic

    I Impact of superconductivity on mechanical properties?

    It is often said that the mechanical properties of metals are mostly due to their free electrons. I'm talking about malleability, ductility and hardness. So, when they suffer a superconductive transition, I expect a drastic change in their mechanical properties, but I haven't found anything on...
  10. G

    Stargazing What explains the Luna impact gap?

    I was reading in Sky and Telescope about the Lunar flash during the eclipse last week, and looking at the impact map (2005-2018) I was wondering why there is a 'gap' with no impacts down the middle. It seems rather unlikely that there would be no 'hits' here. Is this an artifact of the limb and...
  11. D

    Three Car Collision - Can physics help clarify twin impact?

    Hi all, need some help... I was involved in a 3 car accident, mine was the middle car. The car in front came to a hard stop and I was forced to a sudden stop. I believe I came to a complete stop very close to the 1st car. Immediately after, the 3rd car behind hit with great force shunting my car...
  12. L

    Calculating the wavelength of a surface wave after impact

    Homework Statement There's a bucket, filled about halfway with water. The water itself is completely still. A perfect sphere with mass m and volume v are given. The depth of the water, and the radius of the bucket (which may be considered perfectly cylindrical) are both given. In short, you...
  13. L

    Impact of chaos on a system's entropy

    From a heuristic standpoint it makes sense that when a system goes from being periodic to chaotic, the occupied volume of the phase space increases (while not violating liouville theorem). Since the volume of phase space is proportional if not equal to the entropy, shouldn’t entropy always...
  14. Mlesnita Daniel

    B Ideas to protect the Earth from possible asteroid impacts

    Do you have any own idea, on a way to protect the Earth from a possible asteroid impact? (You can not use technologies that are not invented yet, or imaginary. Those that can be invented in the next, let's say, 10 years, are allowed)
  15. B

    Converting energy to force at impact

    Hello This should be simple but for some reason I'm having some trouble with a test we are performing. The end goal is to determine the average force required to damage a section of steel pipe experimentally with an impact tester. We built the tester and know what energy will hit the side of...
  16. Grinkle

    B Observing a Beacon Impact a Neutron Star/Event Horizon

    If I am observing a pinging beacon free-falling into a neutron star from a distance far enough away that I am in approximately flat spacetime, I think I observe the pings redshifting as the beacon gets deeper into the gravity well, in other words I see the clock of the beacon slowing with...
  17. CRuff

    Calculating kinetic energy turned into Pressure (Pascals) during an impact

    Hello, A silly question I'm sure, if a projectile moving at 13.59 m/s with a KE = 527.47 J hits an area of 3 cm^2, what is the force transfer to that area and the resultant pressure applied expressed in Pascals? Do I divide the KE by a volume instead of area to Pa?
  18. rg0ldberg

    A Question of Impact and Damaged Components

    Let's assume this is hypothetical...and may need to be in a different forum... but I am just looking for advice, maybe I am being too critical or perhaps not critical enough to get the proper inspections and repairs. Assume my 2016 Chevrolet 1500 (2419kg) was struck by a vehicle of mass...
  19. iamvksaini

    Flow Quality Impact on airfoil pressure distribution

    I have collected velocity data for a 3-D grid of test section of a low speed wind tunnel.I have tested airfoils for pressure distribution in the same test section for similar free stream conditions. How do I calculate the impact of flow quality in the test section on the test results of pressure...
  20. D

    What is water impact velocity formula?

    Hello Everyone, I am brand new to this forum and I am currently doing "student research project task" where I need to conduct my own experiment basically. I am currently struggling to find a formula for an impact velocity. I hope there is someone in this forums that could help me. What I...
  21. e2m2a

    Impact of speed on the coefficient of rolling friction

    I have conducted an experiment that measures the velocity of an object that is moving on a flat surface. The object rolls on four fixed caster wheels. The wheels are made of some kind of rigid material. Maybe nylon, maybe hard rubber. The total mass of the object, including the wheels, is...
  22. The Bill

    B Simulation of a neutron star's impact on a supermassive black hole?

    Please forgive the awkward title. "Supermassive black hole" uses up a lot of the title character limit. Has anyone made a simulation of what would happen if a neutron star impacted a simplified (Schwarzschild) supermassive black hole? I've seen simulations of a neutron star colliding with a...
  23. F

    Experiments about impact of mass in different areas

    There's important experiments showing the equivalence of inertial mass and gravitational mass ( the Eotvos experiments), but I couldn't really find many that show the equivalence of mass (or the stress-energy tensor) in other contexts. These are some of the variants of mass I'm interested in...
  24. kyphysics

    Does Global Warming Impact Locales Causing it More?

    We know that greenhouse gases are the biggest cause of global warming and that the Earth has gotten warmer and warmer over the past few decades. Question: Since not all locales produce greenhouse gases (namely, carbon dioxide) equally, are the effects of global warming distributed more to...
  25. Q

    Impact and Detonation Calculations

    Can someone help me to calculate the approximate impact on the Earth (as in a mining explosion), of 1 ton of dynamite. And also the equivalent impact of say a 1 ton rock dropped from 10 meters. Trying to estimate this for writing purposes, I very roughly got: Impact of 1 ton of dynamite, Work...
  26. E

    I Does gravity impact the speed of light?

    As a neophyte when it comes to the relativity solutions I have been surfing the web. I came across something in Science Forums. <speculative link deleted> I have now become interested in what gravity does to light. My understanding of the post above is that the reference frame for light...
  27. isukatphysics69

    Find the direction of a blob of clay after impact?

    Homework Statement Homework Equations impulse = mv The Attempt at a Solution so i found the velocity of the blob of clay now i am trying to find the direction. i took the xcomponent initial stuff which was 0.04kg*4m/s*cos45 - 0.03kg*3m/s Then set it to the final x component stuff which i...
  28. P

    Calculating Speed and Force in Water Jet Impact | Fluid Mechanics Homework

    Homework Statement "A jet of water issues from a nozzle, of diameter h_1=0,102 m (and depth b=1 m), at a speed U_1=2,02 m/s. The jet strikes a flat plate of mass M=2,05 kg, as shown in figure, and it breaks into two jets of equal speed and diameter h_2=0,122 m and h_3=0,102 m. Determine the...
  29. L

    Impact force -- Airsoft versus paintball pellets

    Ok, here is a small back story: I love both airsoft and paintball. Airsoft, for those who may not know what it is, is a sport where you shoot 6mm plastic bbs at each other. The bbs have differnt masses to them.. .20g, .25g .28, and .32 are common masses. When i first started last year, i was...
  30. R

    Lift and screw impact velocity

    Homework Statement Consider the elevator and screw in Example 2-17. Assume the velocity of the elevator is 16 mls upward when the screw separates from the ceiling. (a) How far does the elevator rise while the screw is falling? How far does the screw fall? . I have only problem second part of...
  31. E

    Automotive Understanding the Impact of Rapid RPM Change on Torque

    Hello,I've read somewhere that during launch rapid change of RPM causes an increase in torque?What is the point of this?İs that the reason why cars tend to make tires slip when we try to launch at very high RPM?The extra torque added to engine torque?
  32. P

    What is the formula for determining the force of impact in a physics problem?

    So this is my first time posting, but I´ll do my best to be clear (be advised, I have translated the names of the variables from portuguese to inglish so sorry if it is confusing) Today I was asked to solve a physics problem in class, which I had never solved anything else like it before and I...
  33. jim mcnamara

    Google fix for Meltdown & Specter - small impact, good fix

    This is the technical article: https://support.google.com/faqs/answer/7625886 Please do not ask me for an executive summary. I fail Summary 101 repeatedly. Just ask my family. Google fixed the problems and has run extensive tests since September. They found little performance degradation...
  34. I

    Classical ellipsoidal scattering Impact parameter

    Homework Statement (x^2 + y^2)/a^2 + z^2/c^2 = 1 Homework Equations [/B] The Attempt at a Solution the answer is : b(θ) = R / (f^2 * tan^2(θ/2) + 1)^0.5 I can't understand how to calculate this. My attempt : (x^2 + y^2)/a^2 + z^2/c^2 = 1 from this. b^2 + z^2/f^2 = a^2 , f = c/a, z =...
  35. K

    Force of impact (ladder to head)

    Hi everyone! need to calculate the impact force done by the ladder to the head explained in the drawing. Can anyone help? Kyrre
  36. D

    Having Trouble Finding G-Force of an Impact -- Details in post

    Hey guys first post on here for me. Graduated with a BS in Civil Engineering and working full time. Have a problem on my desk that myself and many coworkers are trying to figure out and would like some assistance as we haven't done anything like this in years. Not sure if we even have the...
  37. C

    Impact Energy Absorbed by a Material

    Problem I am designing a force sensing system with piezoelectric force sensors to determine the impact force on an object during a collision. The sensor will be placed between an aluminum block and either a TPU or PLA 3D printed "cover". The cover will be 5cm thick...
  38. Etienne

    Other How to evaluate the impact of my work anywhere to submit it?

    Greetings all, I am an undergrad working on my first first-author paper in theoretical / computational condensed matter physics (near the computational materials science end of the spectrum) and I am looking to getting it published. My advisor has published in many journals, from mid to high...
  39. T

    How is initial acceleration accounted for in the impact of two bodies

    Imagine a moving rigid body B1 like a golf clubhead impacts with a stationary elastic body B2 like a golfball. Imagine that the initial velocity of the golfball at time T1 is zero, and the final velocity of the golf ball at time T2 is some value. Imagine that time T1 is when the clubhead first...
  40. S

    Stargazing Impact of Kepler Telescope Findings on the Drake Equation

    How much more refined are the various variables of the Drake Equation in view of the recent findings by the Kepler Telescope? I imagine fp and ne would surely be better estimates. Is there a study on this anywhere?
  41. F

    Force of impact when dropping an object on the floor

    Hello, I understand that when we drop an object from a certain height on the floor, there is a force of impact (action reaction) once the object reaches the ground. I can easily calculate the final speed of the dropped object before the impact but I need to know either the time or the...
  42. P

    What is the impact speed of the proton in a 4850V capacitor?

    Homework Statement A parallel-plate capacitor is charged to 4850 V. A proton is fired into the center of the capacitor at a speed of v0=2.81 * 10^5 m/s. The proton is deflected while inside the capacitor, and the plates are long enough that the proton will hit one of them before emerging from...
  43. C

    Choosing Proper Filters for High-Speed Accelerometer Impact Sensing

    I’m planning on using the ADXL375 (200g/3200Hz Bandwidth) or ADXL1001 (100g/11,000Hz Bandwidth) to measure the peak accelerations in a crash test dummy’s head during a bicycle/car crash. My goal is to sample at atleast 10,000 S/s using either a Teensy 3.6 or a Rasp Pi3. The dummy will be...
  44. J

    3D Eccentric Impact -- Final Linear and Angular Velocities

    Homework Statement I have been thinking about this problem for comparison of experimental data to theoretical for a project. A hammer with known mass mh and mass moment of inertia Ih is held stationary at 90 degrees. It is released as swings down. At 0 degrees it impacts a block, initially...
  45. C

    B How do I calculate the Impact Force of an object?

    Okay so as you may have already guessed I'm really new to this site (as in I made my account about 2 minutes ago) and I'm really, really bad at maths so I need a lot of help with this question. I'm not even sure if this in the right sub-forum but if it isn't please relocate it to the correct...
  46. C

    Guidance on Sensor Choices for High Speed Impact Sensing

    I am a fourth year biomedical and mechanical engineering student and my final project has to do with designing a crash test dummy. The end goal is to mount the dummy on a bicycle and launch it at ~20kh/h, then it will be struck by an automobile driving at ~30km/h. Various different impact...
  47. R

    I Numeric impact of constraints on sets (passwords)

    Hi folks, I've got everything I need to write a paper on the effect of constraints on passwords... except the math. I actually could write it, but the math would make it much meatier. Here is what I know about math. If the answer to a math problem is obvious, it is probably wrong. If the...
  48. D

    Newton's law of equal/opposite reaction, and bullet impact...

    When fired, a slug's acceleration down a barrel produces an equal backward force. I get that. What I DON'T get, is why there is no rebounding force counter to a slug's impact by the material being struck? The material/molecules simply get impacted and pushed via the force generated. Why is there...
  49. MarkFL

    MHB Tracking Hurricane Irma: Potential US Impact in a Week

    From CNN: Powerful Hurricane Irma is rapidly intensifying in the open Atlantic and poses a major threat to the Caribbean and potentially to the United States next week. With the storm still five days away from the outermost Caribbean islands and at least a week away from any potential US...
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