TONE ATE- CLEANSE- WOL 4 Assignment Booklet 4B 13. A car travelling 100 km/h comes to a stop in 100 m when the brakes are applied. An identical car travelling 100 km/h comes to a stop when it hits a bridge abutment. Which of the following statements is true? A. The change in velocity when the car hits the bridge is greater. B. The change in momentum for the car that braked is greater. C. The impulse of the car hitting the bridge is greater. D. The impulse is the same for both cars. 14. If you lengthen the time during a car crash for the occupants of the car to come to a stop, the forces they experience A. decrease and the impulse decreases B. increase and the impulse stays the same C. decrease and the impulse stays the same D. increase and the impulse increases w force did the vehicle

movement. 12. A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the momentum during the collision are correct? * a. The momentum of the car-truck system is conserved, but the momentum of each one separately is not conserved. b. The momentum of the truck is conserved. c. The momentum of the truck and the car are each conserved. O d. The momentum of the car is conserved. O e. The car and truck must undergo the same change in speed. hp 7. 8

I. Conceptual Physics. Justify your answer. 1. A 10-gram rubber ball and a 10-gram clay ball are thrown at a wall with equal initial speeds. The rubber ball bounces, the clay ball sticks. Which ball exerts a larger impulse on the wall? Justify your answer.

A 1500 kg car accelerates from 15 m/s to 25 m/s. Calculate the impulse experienced by the car.

QUESTION 14 The change in momentum of a body due to a sudden force acting on the body is called Oa. A torque Ob. An impulse OC. A free-fall Od. An explosion Oe. A propulsion

8.) In this photo, a fire extinguisher provides the impulse for a hallway rocket cart. Which is NOT true about the motion of the rocket cart and person? a.) The cart and person are propelled as a result of gas from the fire extinguisher pushing against air in the room. b.) The force of the gas on the cart and person is equal and opposite to the force of the person and cart on the expelled gas.      c.) The momentum of the cart and person is equal in magnitude and opposite in direction to the momentum of the expelled gas.

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A time-dependent force, F(t) = (8t + 9t^2) N, acts in the x-direction on a 2.0 kg stationary object. Find the momentum of the object in the x-direction after the force has acted for 1 s.

1. Calculate the magnitude of the impulse during the collision. 2. Calculate the magnitude and direction of the velocity of the 4.0 kg cart after the collision. 3. Calculate the mass m of the second cart

9. An athlete who is initially at rest in a squatted position jumps vertically upward and then lands going back to the original squatted position (ending at rest with the same center of mass height as at the start). The time period under consideration begins just before the athlete starts the upward motion and ends just after she has landed and comes to rest back in the squatted position. Compare the magnitude and directions of the impulse from the force of the ground on the athlete to the impulse from gravity on the athlete during this time period. Note: there are no other significant forces other than the ground and gravity acting on the athlete during this time period. of