1.6. Momentum
A subsection of Physics, 0625, through 1. Motion, forces and energy
Listing 10 of 84 questions
shows a hammer being used to drive a nail into a piece of wood. hammer head nail wood The mass of the hammer head is 0.15 kg. The speed of the hammer head when it hits the nail is 8.0 m / s. The time for which the hammer head is in contact with the nail is 0.0015 s. The hammer head stops after hitting the nail. Calculate the change in momentum of the hammer head. change in momentum = State the impulse given to the nail. impulse = Calculate the average force between the hammer and the nail. average force =
0625_m16_qp_42
THEORY
2016
Paper 4, Variant 2
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Explain why momentum is a vector quantity. The crumple zone at the front of a car is designed to collapse during a collision. crumple zone concrete wall In a laboratory test, a car of mass 1200 kg is driven into a concrete wall, as shown in . A video recording of the test shows that the car is brought to rest in 0.36 s when it collides with the wall. The speed of the car before the collision is 7.5 m / s. Calculate the change of momentum of the car, change of momentum = the average force acting on the car. average force = A different car has a mass of 1500 kg. It collides with the same wall and all of the energy transferred during the collision is absorbed by the crumple zone. The energy absorbed by the crumple zone is 4.3 × 105 J. Show that the speed of the car before the collision is 24 m / s. Suggest what would happen to the car if it is travelling faster than 24 m / s when it hits the wall.
0625_m17_qp_42
THEORY
2017
Paper 4, Variant 2
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shows an athlete crossing the finishing line in a race. As she crosses the finishing line, her speed is 10.0 m / s. She slows down to a speed of 4.0 m / s. The mass of the athlete is 71 kg. Calculate the impulse applied to her as she slows down. impulse = Define impulse in terms of force and time. The athlete takes 1.2 s to slow down from a speed of 10.0 m / s to a speed of 4.0 m / s. Calculate the average resultant force applied to the athlete as she slows down. force = Calculate the force required to give a mass of 71 kg an acceleration of 6.4 m / s2. force =
0625_m20_qp_42
THEORY
2020
Paper 4, Variant 2
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Questions Discovered
84