In a collision when is momentum conserved

Do they experience a greater force if the collision is elastic or perfectly inelastic and they stick together? If the collision is perfectly inelastic, calculate the speed and the direction of the players just after the tackle.

A 30, kg freight car is coasting at 0. What is the final velocity of the loaded freight car? What was the angle between their initial directions? Find the speed of the pucks after the collision, if half the kinetic energy is lost during the collision. During a visit to the International Space Station, an astronaut was positioned motionless in the center of the station, out of reach of any solid object on which he could exert a force.

Suggest a method by which he could move himself away from this position, and explain the physics involved. Football coaches advise players to block, hit, and tackle with their feet on the ground rather than by leaping through the air.

Using the concepts of momentum, work, and energy, explain how a football player can be more effective with his feet on the ground. Keep in mind that we must designate a positive direction and a negative direction. We will use east as positive and west as negative. Since the final velocity is positive, we can determine that they train cars are traveling toward the east. A bullet is fired at at a block of wood that is moving in the opposite direction at a speed of.

The bullet passes through the block and emerges with the speed of , while the block ends up at rest. This problem is a conservation of momentum problem. When doing these types of problems, the equation to jump to is:. It is given to us that is or , is , is unknown, is. With all this information given, the only unknown is.

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Hanley Rd, Suite St. Louis, MO Subject optional. Email address: Your name:. Example Question : Mechanics Exam. In an inelastic collision, which combination of quantities is conserved? Possible Answers: Kinetic energy and potential energy. Correct answer: Mass and momentum. Explanation : In a perfectly inelastic collision, the two colliding objects stick together; the two colliding objects deform, but mass is still conserved. Report an Error. In an elastic collision, what combination of quantities is conserved?

Possible Answers: Mass, momentum, and kinetic energy. Momentum, kinetic energy, and potential energy. Correct answer: Mass, momentum, and kinetic energy. Explanation : The primary difference between elastic and inelastic collisions is the conservation of kinetic energy.

In an elastic collision, both momentum and kinetic energy are conserved. Almost no energy is lost to sound, heat, or deformation. The first rubber ball deforms, but then quickly bounces back to its former shape, and transfers almost all the kinetic energy to the second ball.

A car's bumper works by using this principle to prevent damage. In a low speed collision, the kinetic energy is small enough that the bumper can deform and then bounce back, transferring all the energy directly back into motion. Almost no energy is converted into heat, noise, or damage to the body of the car, as it would in an inelastic collision. However, car bumpers are often made to collapse if the speed is high enough, and not use the benefits of an elastic collision.