Impact Definition and 956 Threads

A friend posed this question to me tonight. If a vehicle hits a stationary object and you know the distance traveled of the object, the weight of the object, the model of the vehicle and that conditions were dry on a tarmac road, is it possible to work out the speed of the vehicle on impact?

Hey Guys, I have a problem I am working on and was wondering if someone could point me in the right direction. The problem: I need to calculate a force to apply to a given area of the front of a vehicle in relaticely small collision / impact with both a stationary and possibly a small...

Is the biggest danger of an asteroid hitting Earth the debris released from the asteroid? Looking at general articles it seems that the global risk arises from the debris released into the atmosphere which would affect climate. What would happen if no debris was released? I mean, if the...

We have the following problem we're trying to solve: A helicopter is landing at 6 ft/sec, with its nose tilted up 15 degrees. We're designing a bumper that sits under the tail that has to absorb enough energy to reduce the maximum moment experienced by the tail to 350,000 in. lbs. Our bumper...

hey guys i need help charpy impact test. i have attached my graph with the results we had. Does this seem correct? from the graph how do i determine the transition temperature T1 for the material where T1 is normally defined as the temperature corresponding to 50% of energy change between the...

Hello I'm tasked to evaluate the roof of a small power station situated beneath a rather high tower in an alpine landscape, by means of FEA. One requirement is that the roof shall endure chunks of ice falling on it. Problem is, I am stumped as how to find the loads. The Eurocode norms I am...

Hello all, I just finished building an expansion cloud chamber this weekend and have started experimenting with it. Everything looks solid (vacuum, seal etc) but I'm curious about the role my electrostatic field, generated from a bug zapper and a circuit, plays in visualizing the ionizing...

Hi all, this is my first post on Physics forums so I apologise in advance if I have posted in the wrong section etc. This is something that I have been trying to figure out for nearly a week now! I have modeled a vehicle in Solidworks, specifically an external roll cage, and hope to conduct a...

I am given a milk carton (the small kind you drink in schools), and need to protect an egg by adding what ever I can inside the milk carton (nothing can be outside it). my teacher will first: 1) Drop it from the ceiling (9ft, 2.7 meters) 2) Drop a 16lb (7kg) bowling ball on it from a...

I'm working on a small design project and need some help remember what equations to use here. Basically, we are creating a hammering device. A compression spring will be loaded, and a block on the end is accelerated into another block. I need to have it hit with a certain impact force so I am...

QUESTION: I have two solenoids, one connected to a power supply so that current flows through the coil, and the other connected to a galvanometer. When I disconnect the power supply in the left coil, current flows momentarily in the right coil. Explain why and predict which way the...

Homework Statement An engine is suddenly coupled to a rotating drum by a friction clutch. the moment of inertia of the engine is equivalent to a mass of 40kg acting with a radius of gyration of 111mm. the drum has a mass of 10kg and a radius of gyration of 100mm. the initial velocity of the...

Hello everyone, I'm new here. I'm relatively familiar with some astrophysics calculations, but this particular equation is kicking my proverbial butt. I'm currently writing a sci-fi book series and there's an impact that happens on a moon, but I want to be able to realistically calculate what...

Any problem of collision can be solved using four equations: Conservation of momentum and energy, impulsive forces and impact parameter (distance between center of masses of the particle taken perpendicular to velocity). I can solve problems using first three cases. But how to analyse a problem...

The bright spot about being ignorant is you don't realize how complicated a question can be. Original question: Two sledge hammers, one is 10lb with 5.062 sq in striking face. One is 16lb with 8.265 sq in striking face. I was asking for the difference in force between the two. Things...

can anyone tell me how the orifice diameter can affect the vortex forming ? no much info from internet , thanks for help~:smile:

Hi,I want to design a crude pendulum impact device which i can use to measure initial velocities of objects on a frictionless surface. i.e measure energy at the start and end of the pendulums swing, to see how much has been absorbed into the impact. Heres my question about momentum on...

What is the effect of inserting any ferromagnetic, diamagnetic etc in magnetic field?? let me say there is a solenoid of turns per unit length n.magnetic field inside the solenoid will ~μnI. what will happen if an ferromagnetic substance like iron is inserted. How will it effect the magnetic...

Why isn't the influence of air pressure assimilated in Archimedes law? If an obect is more dense than the fluid, it wil sink. That is clear, but suppose I could lower down de air pressue, so less force that tends to push the object tot the surface. Is there any situation possible of adjusting...

I attached the problem statement only with PART of the solutions. He is using the conservation of energy to find the velocity of the anvil. T=Kinetic energy V sub e=potential energy of the spring V sub g=potential energy of gravity The part I am not understand is how ΔV sub e =...

Homework Statement consider two balls of exactly the same size and material. Ball A is filled with air and ball B is filled with water.if dropped from a height of 100 feet,which will hit the ground first? Homework Equations U=mgh. The Attempt at a Solution i suggest the ball B will...

Ok so I am a professional freestyle skier who jumps off of cliffs into powder (light fluffy snow). I found a big cliff that I may go jump off and I know that it is physically possible to land and ski away from, but I also have an interest in physics, (with 0 knowledge), and I have been trying to...

I often hear about collisions in terms of impact force. For instance, "the boxer delivered a punch with 100 lbs of force." I have a pair of steel toed shoes that are rated to withstand 70 lbs of force (311 N). But if the shoe experiences an impact instead of being loaded very gradually, wouldn't...

The question really explains the primary question but I have another quick one as well. How come sound isn't measured in Joules if it is a form of energy?

Homework Statement A 0.211 kg shoe is dropped onto a vertically oriented spring with a spring constant of 102 N/m. The shoe becomes attached to the spring upon contact, and the spring is compressed 0.117 m before coming momentarily to rest. If the speed of the shoe just before impact is...

So I am finishing a physics paper that I am about to post on the web. Much of this paper involves the very same issue I have been thinking about in 2008 when my then-girlfriend, Jennifer, was trying to get me to participate in a dance class. I distinctly remember being in that dance class...

Hey, I'm struggling with this question, any help would be great. A sphere of mass m impinges obliquely on a sphere of mass M, which is at rest. The coefficient of restitution between the spheres is e. Show that if m=eM, the directions of motion after impact are at right angles My attempt...

http://desmond.imageshack.us/Himg843/scaled.php?server=843&filename=23518417.jpg&res=medium The crucial thing I'm not understanding here is how they know that after the collision (shown at the bottom of the picture), the horizontal velocities of each particle are reversed. Surely we don't...

I've been looking around for information on Saturn's moon, Titan, to present to my class. One thing that wikipedia seems to say about the moon is that it has distinctly fewer impact craters than other moons of its size and position in the solar system. Supposedly, this is attributed to some...

I'm not looking for someone to work this one out for me, and I know I have done this type of problem in entry level physics, but it's popped up again in dynamics, and physics is mostly a blur these days. Given the muzzle velocity and impact coordinates of a rifle, find the angles of elevation...

Homework Statement In the past months I've been working on a work calculating the behavior of a wall at an object impacting into it. I thought I have made it by knowing the impact force and the pressure it makes but then I realized that to fully complete my work I have to somehow calculate the...

Homework Statement Two cars collide at right angle in the intersection of two icy roads. Car A has a mass of 1000 kg and car B 1400 kg. The cars become entangled and moved off together with a common velocity v’ in the direction indicated in figure QB4. If car A was traveling 10 m/s at the...

I hope I'm not asking too much. Other Driver hit Family Member. I want to calculate how fast OD was going. Desired results would be accurate to within 5 MPH or less. OD was in a 2003 Hyundai Elantra; googled curb weight around 2700. FM was in a 2005 Nissan Titan; googled curb weight...

Homework Statement Hello and thank you for reading my question. I am attempting to calculate what effect on a wall has an impact (a car impact or as in my theoretical calculations a punch) of an object into it. With effect I mean how strong impacts can a wall a, survive and b, stay...

Homework Statement A young student, dissatisfied with simply dropping fruit, decides to throw an apricot off a cliff. The apricot leaves the top of the cliff at a speed of 25 m/s and at an angle of 50° above the horizon. If the cliff is 310m tall, how far down range is the fruit when it hits...

I have been doing some calculations on a falling object and its impact force. We use heavy weights on our belt conveyors to maintain tension on the belts. One of our calculations relates to the amount of force placed on the structure that one of these weights lands on. I have the calculations...

Homework Statement The complex [Mn(CO)5Cl]+ is reduced by one electron and then by a second electron afterwards. How would the first reduction affect the C-O bond length in carbon monoxide? How would the second reduction affect the C-O bond length? Homework Equations The Attempt at...

Here's my situation... I have a loader dumping rock onto a proposed screening rack to separate stone sizes. The typical load is estimated at 4100kg and falls about 1m above the screen. My velocity at impact works out to about 4.4m/s just before impact (determined by SQRT(2 x 9.81m/s^2 x...

How big would an asteroid or comet need to be to say, disturb the moons orbit, either by impact or gravitational attraction? And would this significantly alter the chances of "Death From Above"? :)

some device or contraption to measure point impact velocity - ballistic pendulum ? i hope you guys and gals can point me in the right direction for a prototype i am working on. I am looking for a device that measures impact velocity. much like a ballistic pendulum only much sturdier than the...

Homework Statement A weather vane sits quietly on the roof of a barn on a calm winter's day. It has a length of x, is pole-shaped with mass M, and rotates frictionlessly about its center. But just now it is still. Suddenly Justin throws a snowball of mass m at speed v that hits it a...

Homework Statement So. I'm a muzzleloader hunter. If my rifle has a sight height of .85 inches. and groups at 25yards are 1.5 inches above 0 and groups at 50 yards are 2.5 inches above 0. The bullet I'm using has a ballistic coefficient of .205. The bullet weight is 240 grains. Is it possible...

Homework Statement 1. Homework Statement On a frictionless table, a glob of clay of mass 0.72 kg strikes a bar of mass 1.34 kg perpendicularly at a point 0.23 m from the center of the bar and sticks to it. If the bar is 1.22 m long and the clay is moving at 8.3 m/s before striking the...

If I know the mass of an object, the force of impact, how do i calculate the distance the object is from the impact point? i have a stationay object of known mass being hit with a piston at a known force and speed can i work backwards and determine at what height if dropped would be equivalent...

First of all, let me apologize for being a total math newb. I love geometry but I barely made it out of algebra alive...and that was 21 years ago. My girlfriend was recently involved in a car accident where she was charged with "Failure To Yield". Based on a spectacularly non-stellar...

If you went back in time and brought with you modern day devices, could you teach the people of that day (to a certain extent) how to create and use these devices? What impact would this have the modern day? Would we be more evolved?

I used some formulas to determine the impact force of a bubble wrapped 1kg object dropped 1 meter and traveling .03m after impact. But I need some help with the next part. What if an identical bubble wrapped 1kg object is placed on top and both are dropped at the same time? Will the wrapping...

I'm doing a physics assignment on safety devices such as helmets and i need help with a question. Why is the Impact force reduced for a helmet with a soft interior VS a hard interior? I know it is because the soft padding on the inside of soft the helmet will reduce the time taken for your...

I have searched online and found that the power of a punch P=Fv, where F is the force of the punch and v is the speed. But in my mind it works like this: let's just say that only the arm speed is taken into account, then before impact, the energy of the arm traveling is E=(1/2)mv^2. That is how...

Homework Statement vinit = sqrt(2g*h); h = drop distance vfinal = 0; xinit = 0; xfinal = 100mm; a = g; Issue: non-linear damping. M*x'' - b*(x')^2 - k*x = 0; b = 128*mu*(length fluid travels)*(D^4(piston)/[(D(hydraulic)^4)(orifice opening)]every book I've been reading on vibrations damping...