Impact Definition and 956 Threads

Hi guys, I have been searching for references that could tell what are the average limits of impact (in Newtons per example) of running activity into human´s feet (material = bone). Basically the question I am trying to answer is per example to understand how much of linear acceleration...

How do you calculate the amount of pounds per square inch force on say a female human being approximately five feet tall at 185 pounds at rest being struck by a moving vehicle at motion by gravity with a curb weight of 2700 lbs going 4 mph.

Could someone help me with this problem? I have a scenario where a glass door is being caught by the wind and slamming against a door stop and shattering. I would like to work out the impact energy of the door hitting the stop, and if possible an equivalent static force. The door is 1.5m...

I recently read that the impact of air resistance on the horizontal range increases as the launch angle increases (http://moodle.davidson.edu/moodle2/pluginfile.php/121168/mod_resource/content/2/Brancozio%20fly-ball%20paper.pdf). A graph depicting this is attached. Is there a reason for why this...

Hi, Homework Statement I'm doing some research into the hydraulic jump and was wanting some help in calculating the impact force. Hydraulic jump is a phenomenon to do with the turbulence of the water - it is the 'ring' around the stream of water when a tap is turned on Homework Equations The...

Hi, I'm doing some research into the hydraulic jump and was wanting some help in calculating the impact force. The equation I have found to use is: F = m g h / s I have the mgh, and was wondering what to use as the slow down distance. If you didn't know what the hydraulic jump was, it is a...

Homework Statement A ball rolls off a table at speed v and impacts the floor at distance d. What is the angle between the path of the ball and a vertical line drawn at the moment of impact. Homework Equations I have derived from basic projectile motion formulae: Time of impact t =...

This EJP paper is open access, so you should be able to read it. The conclusion isn't unexpected, because having a "scaffolding" to guide a student through a problem is almost like hand-holding without an instructor being there. I've used this type of questions during quizzes and maybe even...

I have an argon piping system. The pressure is set at 50 psi. Assume no pressure drop. I have a flowmeter that is calibrated to run at 25 psi. Basically, I want to know what the "new" scale will be on the flowmeter as a result of the increased pressure (from 25 to 50 psi). In other words...

I am trying to reduce the noise created from a machine that makes contact (impact) with a thin plate. I just don't have anyone to bounce ideas off of. I can change the support geometry to whatever I want as long as it will with stand a static load and the impact. I can handle this, but the...

Hi everyone. Most of what I've read on thermal neutron cross sections talks only about what isotope makes up the neutron target. Likewise, all of the cross sections listed on Sigma: http://www.nndc.bnl.gov/sigma/index.jsp?as=9&lib=endfb7.1&nsub=10 ... are broken down just by isotope. However...

What is the experimental outcome of a single photon or electron double slit experiment under the constraint that after each detection the detector material is reset to the original state ie, in the limit it is substituted by another detector sheet, or photographic plate. Of course that the...

Today, I discussed my friend about two rigid beams impact and assuming no energy loss in the impaction. As in the above figure, the upper beam move down with a uniform velocity ##v_c##, and hit a beam with ##0## velocity. After that the above beam will rotate and move away, which can be...

Hello Everyone, I am brand new to this forum and know basically nothing about physics, but I am hoping there is someone in these forums that could help a layperson obtain a comprehensible answer to a question that is simply above his head. I have a home whose water pressure averages between...

Hello Folks! I want to find the maximum applicable force on a full suspension mountain bike and i will use this force on a FEA software structural analysis for a uni design project. This bike has a rear suspension with 400 lbs/in spring rate.Also rear wheel vertical displacement(travel amount)...

by Ken Croswell The Martian moons look like asteroids—dark, crater-pocked, and potato-shaped—suggesting Mars had snatched them from the nearby asteroid belt. But now planetary scientists have conducted the first computer simulations that bolster a controversial alternative idea: The satellites...

Homework Statement Two elastic bars are joined. A step wave is coming in from left. Derive the shape and magnitude of the reflected wave if the right bar is approximated by a rigid body (point- mass) that is free to move in the axial direction. The Attempt at a Solution I have problem with...

Homework Statement A bullet of mass 2.0 * 10-3 kg is fired horizontally into a free-standing block of wood of mass 4.98 * 10-1 kg, which it knocks forward with an initial speed of 1.2 m s-1. (a) Estimate the speed of the bullet. (b) How much kinetic energy is lost in the impact? (c) What...

I know an exact answer is impossible but an estimate will prove the following statement impossible. Allstates insured driver said he backed up hit my sons motorcycle, did not feel the impact, and stopped when he heard it hit the ground. He parked and got out and the motorcycle was 3' from the...

Homework Statement I have always learned (and read) that an increase in the number of bits causes the height of the 'step' on the graph to decrease. I tried to think about it but cannot come up with a proper explanation for this. THe books I read do not explain why? Can someone please explain...

In the Earth forum, there is a thread about the Nepal earthquakes which started with a mag 7.8 earthquake. This thread is about the human impact. More than 2,200 confirmed dead in Nepal earthquake http://news.yahoo.com/aid-starts-coming-nepal-quake-kills-nearly-2-050207892.html International...

Hi, I've got this water circulation system. Diagram attached: http://postimg.org/image/wmf2hql6p/ In the upper container jets of water come out from the pipe due to the small holes I have drilled into the sides. I would like to know how I can work out the impact pressure on surfaces that may...

I have performed an impact test on different football shin guards to assess their performance. I am however confused with the readings measured by the accelerometer I have used. The sensor was attached to a striking mass of 4.3 kg which was dropped at different heights. The graph I have attached...

Hello, I just have a quick question about electron impact ionization. How exactly are the electrons accelerated? Are they attracted by an anode?

I have an old Windows Vista PC that has started acting up. Normally it is in the sleep mode. Lately when I push the start button the fans start running for 2-3 seconds and then it shuts down. This can happen many times in a row but if I lift one side of the computer case a bit (which lies flat...

Hi, I'm just an average guy here, mostly self educated, and am looking for experts to verify my theories on developing revolutionary impact protection. If I disrupt direct impact to the head using a highly elastic layer of material, does that create an inelastic impact interruption? A helmet...

Hi, I am dropping an object of mass m at different heights on another body. From the accelerometer I have I can get the g-force and then convert it into Newtons. What I am wondering, is the force converted into Newtons equal to the impact force the mass exerts on the body?

Homework Statement I want to find the ionization cross section in a mass spectrometer for the gas Argon. The value obtained should be in the 2x10-16 cm2 range. Homework Equations Q = ionization cross section I = K(V,B)xNxQxdxIe Where I = (0.17 x 10-11, K(V,B) =1, d = 0.1 cm, and Ie = 5 x...

Hi. I just saw this: http://phys.org/news/2015-03-einstein-scientists-spacetime-foam.html They are saying that they have found data showing that the "quantum foam" does not exist. What is the impact of the disproof of "quantum foam", anyways, on the search for a theory of quantum gravity?

Hi, I am doing a drop impact testing on a football shin guard. I know how to find the impact force but how do I determine the energy absorbed by shin guard during impact?

Is there any way to obtain the exact function of force with respect to time of an impact? I have heard of the equation: http://www.sciweavers.org/upload/Tex2Img_1425867132/render.png which tells you the impulse of an object with constant velocity as it impacts another object.

Impact: Earth! A meteor/comet impact simulator(text only) provided by Purdue University. Lots of fun. :smile: You can smash things into the Earth varying the diameter, density, velocity, angle, land or water entry, and your distance from impact. 1 meter: very boring. happens every 1.1 year...

Homework Statement " A 1100 kg lift is suspended by a series of 24 steel cables of mean diameter 20mm. The cables are attached to the lift top and are arranged so that torsional vibration is minimised.If the cable is manufactured from steel with an elastic modulii of 185GN/m2 and elastic...

Homework Statement The electric field strength is 2.50×104 N/C inside a parallel-plate capacitor with a 1.20 mm spacing. An electron is released from rest at the negative plate. What is the electron's speed when it reaches the positive plate? Homework Equations F = eE = ma vf2 = vi2 + 2ad...

Homework Statement Hello, new to the physics world, I am trying to self-teach through reading textbooks, videos etc and application. I came across a problem I do not know how to begin to answer. A dodgem car of mass 200g is driven due south into a rigid barrier at an initial speed of 5.0...

Homework Statement In this problem, you will estimate the cross section for an earth-asteroid collision. In all that follows, assume that the Earth is fixed in space and that the radius of the asteroid is much less than the radius R of the earth. The mass of the Earth is M_e, and the mass of...

Why did Dark Matter have less of an Impact on the Universe than Dark Energy? Under a different set of universal laws, do you think it would be possible for Dark Matter to have more of an impact than Dark Energy during an alternate big bang to create a infinitely dense point as a universe?

I need to work out the impact energy for three different drop heights. I am really struggling to get my head around it. Am i on the right lines with this? mgh = (1/2) mv2 Please excuse my basic knowledge, I left school 21 years ago with a D in maths, but I am now trying to improve my maths...

for example say I were to roll a magnetic ball down a hill and placed another magnet at the end of the hill, would the magnetic ball hit the magnet with more force than a non magnetic ball. This question is for my science fair, all people answering must be prepared to answer follow-up questions...

There is a thread on plunging into water but it doesn't specify how you land. Consider that a man plunges into the water vertically with his toes pointing downwards, streamlining his body to the maximum possible extent. How can you calculate if the person falling will die or not? Rather how can...

Hi folks, this is a problem I am having in a collage project I am doing. I'm not too sure about my results and keep chasing my tail using the same formulas, e.g. F=ma etc. I think I need to allow for the fact that the force is applied as a collision but I am not sure how or if I need to do it...

Mentors Note: Posts from a duplicate thread have been merged into this one. Hello, please explain the following in detail. I am a learning assistant (LA) at a major university but am stuck explaining a concept to my students. Does mass have an impact on an inclined plane? A cart with wheels or...

When a stellar object falls into the Earth's surface, it creates a crater on the ground. Most of the times, when people refer to these things, they refer to their age and their diameter/radius. My question is mainly about the radius. Is there a dynamical way to solve for the shape and radius of...

Hi, I am attempting to design a plastic scrap grinder. To begin my calculations I need to know the force needed to shear a certain area of plastic. After noticing that by using the shear stress equation would result in a huge, unrealistic force, it came to my mind that the plastic will be cut by...

I need to find the impact force that can be absorbed by these spacers as shown in the image. The spacers are radially distributed over the shell, and they are supposed to dampen any external impact loads to reduce the effective stress inside the inner shell. Since the FEA model is not showing...

Hi :) Here is a true story... I was in my car which weighs 820 Kgs, I for arguments sake weighs 80Kgs and the vehicle has an acceleration of 0-100 Kph in 15sec I was at a stop and went to go around a stationary vehicle in front of me.. I locked the wheel and attempted the pass but instead made...

1. An asteroid is 10r away from the earth, and traveling at a speed of 12 km/s. What is the impact speed of the asteroid when it hits the earth?2. Gravitation problem: U = -Gm[E]m / r ...I think3. I've been looking in my book and online and cannot figure it out, please help!

Homework Statement [/B] Suppose that an asteroid traveling straight toward the centre of the Earth were to collide with our planet at the equator and bury itself just below the surface. What would have to be the mass of this asteroid, in terms of the earth’s mass, for the day to become 28.0%...

How does TPU compare to other thermoplastics in regards to impact strength? How does the impact strength of PU vary depending on its form?

Can someone please explain the significance of resonance levels that forms when electron collides with atoms. How this resonance levels are different from other levels ?