2.A moving car with a mass of 1,524 kg has a momentum of 18,000 kgm/s. What is its average velocity?
A. approximately 10 m/s C. approximately 12 m/s
B. approximately 11 m/s D. approximately 13 m/s
3.A person with a mass of 50 kg is at rest. What is the person’s average velocity and momentum?
A. 0 m/s and 50 kg m/s C. 2 m/s and 25 kg m/s
B. 1 m/s and 50 kgm/s D. 0 m/s and 0 kg m/s
4.A 0.5-kg baseball was thrown in the air with a momentum of 2.5 kgm/s. What is the baseball’s average velocity?
A. 5 m/s C. 0.2 m/s
B. 5 m/s2 D. 0.2 m/s2
5. An airplane with a mass of 79,000 kg is taking off at an average velocity of 76 m/s. What is the airplane’s momentum?
A. 6,000,000 kgm/s C. 6,040,000 kgm/s
B. 6,004,000 kgm/s D. 6,000,400 kgm/s
6. If the mass and the momentum of an object are given, how do we find the value for its velocity?
A. Divide the object’s mass by its momentum.
B. Multiply the object’s momentum by its mass.
C. Divide the object’s momentum by its mass.
D. Multiply the object’s mass by its momentum.
7.How does the value of the velocity of a person at rest affect his/her momentum?
A. The momentum of that person at rest is decreasing.
B. The momentum of that person at rest is zero.
C. The momentum of that person at rest is increasing.
D. The momentum of that person at rest cannot be determined.
8. Which would be harder to stop, a rolling bowling ball or an airplane taking off? Why?
A. A bowling ball, because it has typically less mass than an airplane.
B. A bowling ball, because it has typically more mass than an airplane.
C. An airplane, because it has typically less mass than a bowling ball.
D. An airplane, because it has typically more mass than a bowling ball.
9. Vehicles usually indicate the maximum capacity of passengers. Why do you think it is important not to exceed its maximum capacity? Use the concept of momentum in explaining your answer.
A. The brake system is designed to effectively stop the vehicle within a limited mass capacity. Excess passengers will lead to increased mass, which will increase the momentum and may cause the brake system to malfunction.
B. The brake system is designed to effectively stop the vehicle within a limited mass capacity. Excess passengers will lead to increased mass, which will decrease the momentum and may cause the brake system to malfunction.
C. The brake system is designed to effectively stop the vehicle within a limited mass capacity. Excess passengers will lead to decreased mass, which will increase the momentum and may cause the brake system to malfunction.
D. The brake system is designed to effectively stop the vehicle within a limited mass capacity. Excess passengers will lead to decreased mass, which will decrease the momentum and may cause the brake system to malfunction.
10. A car was heading towards a wall. It applied -140N of force in its brakes until it comes to a stop in 10 seconds.What is the impulse on the car?
A. -14 Ns C. -1400 Ns
B. 14 Ns D. 1400 Ns
