Impulse and Momentum Worksheet

Impulse and Momentum worksheet: 1. How long must a 100 N net force act to produce a change in momentum of 200 kg·m/s? (A) 0.25 s (B) 0.50 s (C) 1.0 s (E) 4.0 s 2. Which is a vector quantity (A) energy (B) mass (D) power (E) work 3. When the velocity of a moving object is doubled, its _____ is also doubled. (A) acceleration (B) kinetic energy (C) mass (E) potential energy. 4. Two objects, P and Q, have the same momentum. Q can have more kinetic energy than P if it has: (A) More mass than P (B) The same mass as P (D) The same speed at P (E) Q can not have more kinetic energy than P 5. A spring is compressed between two objects with unequal masses, m and M, and held together. The objects are initially at rest on a horizontal frictionless surface. When released, which of the following is true? (A) Kinetic energy is the same as before begin released. (B) The total final kinetic energy is zero. (C) The two objects have equal kinetic energy. (D) The speed of one object is equal to the speed of the other. 6. Net Impulse is best related to (A) momentum ( (D) change in kinetic energy (E) none of the above (C) kinetic energy 7. Two football players with mass 75 kg and 100 kg run directly toward each other with speeds of 6 m/s and 8 m/s respectively. If they grab each other as they collide, the combined speed of the two players just after the collision would be: ( (B) 3.4 m/s (C) 4.6 m/s (D) 7.1 m/s (E) 8 m/s 8. A 30 kg child who is running at 4 m/s jumps onto a stationary 10 kg skateboard. The speed of the child and the skateboard is approximately: (B) 4 m/s (C) 5 m/s (D) 6 m/s (E) 7 m/s 9. A 5000 kg freight car moving at 4 km/hr collides and couples with an 8000 kg freight car which is initially at rest. The approximate common final speed of these two cars is (A) 1 km/h (B) 1.3 km/h (D) 2.5 km/h (E) 4 km/h 10. A rubber ball is held motionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between the total energy E of the ball and its height h above the surface. 11. Two carts are held together. Cart 1 is more massive than Cart 2. As they are forced apart by a compressed spring between them, which of the following will have the same magnitude for both carts. (A) acceleration (B) change of velocity (D) speed (E) velocity 12. If the unit for force is F, the unit for velocity is v and the unit for time t, then the unit for momentum is (B) Ftv (C) Ft2v (D) Ft / v (E) Fv / t 13. A ball with a mass of 0.50 kg and a speed of 6 m/s collides perpendicularly with a wall and bounces off with a speed of 4 m/s in the opposite direction. What is the magnitude of the impulse acting on the ball? (A) 13 J (B) 1 Ns (D) 2 m/s (E) 10 m/s 14. A cart with mass 2m has a velocity v before it strikes another cart of mass 3m at rest. The two carts couple and move off together with a velocity of (A) v/5 (C) 3v/5 (D) 2v/3 (E) (2/5)1/2 v 15. Consider two laboratory carts of different masses but identical kinetic energies and the three following statements. I. The one with the greatest mass has the greatest momentum II. The same impulse was required to accelerate each cart from rest III. Both can do the same amount of work as they come to a stop Which of the above statements would be correct? (A) I only (B) II only (C) III only (D) I and II only 16. A mass m has speed v. It then collides with a stationary object of mass 2m. If both objects stick together in a perfectly inelastic collision, what is the final speed of the newly formed object? (B) v / 2 (C) 2v / 3 (D) v (E) 3v / 2 17. A Freight car is moving freely along a railroad track at 7 m/s and collides with a tanker car that is at rest. After the collision, the two cars stick together and continue to move down the track. What is the magnitude of the final velocity of the cars if the freight car has a mass of 1200 kg and the tanker car has a mass of 1600 kg? (A) 0 m/s (B) 1 m/s (D) 4 m/s (E) 6 m/s 18. A 50 kg skater at rest on a frictionless rink throws a 2 kg ball, giving the ball a velocity of 10 m/s. Which statement describes the skater’s subsequent motion? (A) 0.4 m/s in the same direction as the ball. (C) 2 m/s in the same direction as the ball (D) 4 m/s in the same direction as the ball (E) 4 m/s in the opposite direction of the ball