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WorksheetsCenter of Mass, Impulse and Momentum, Collisions
Total questions: 15
Worksheet time: 9mins
1. Which quantity is always conserved in all types of collisions?
kinetic energy
mechanical energy
momentum
potential energy
2. In a perfectly elastic collision, what is conserved?
Only kinetic energy is conserved.
Only momentum is conserved.
Neither momentum nor kinetic energy is conserved.
Momentum and kinetic energy are conserved.
3. If you double the mass of a system but retain its velocity, what happens to its momentum?
decreases to one-fourth
decreases to one-half
increases to twice
increases to four times
4. What is the coefficient of restitution for an inelastic collision?
0
1
from 0 to 1
between 0 and 1
5. Describe a situation where momentum is conserved but kinetic energy is not.
A rocket launching into space with fuel expulsion.
A car crash where two cars collide and stick together.
A ball rolling down a hill without friction.
A person jumping off a diving board into a pool.
6. How does the center of mass change when two objects collide?
The center of mass always moves towards the heavier object.
The center of mass remains constant if no external forces act on the system.
The center of mass changes direction with every collision.
The center of mass is irrelevant in elastic collisions.
7. What would happen to the center of mass of a person if his right leg would be amputated?
It shifts to the left and upward.
It shifts to the right and upward.
It shifts to the left and downward.
It shifts to the right and downward.
8. Give an example of a real-world scenario where impulse is significant.
A person lifting a heavy box.
A car accelerating on a highway.
A balloon floating in the air.
A baseball player hitting a ball.
9. In a two-body collision, if one object is at rest, how do you calculate the final velocities?
Apply the Pythagorean theorem to find the final velocities.
Use conservation of momentum and kinetic energy formulas.
Use only the initial velocities of the objects.
Ignore the mass of the objects in calculations.
10. What happens to kinetic energy in an inelastic collision?
Kinetic energy is completely converted into potential energy.
Kinetic energy increases significantly after the collision.
Kinetic energy is conserved and remains the same.
Kinetic energy is not conserved and decreases.
11. Which quantity increases as a free-falling object approaches Earth's surface?
momentum
stopping force
both momentum and stopping force
neither momentum nor stopping force
12. What role does impulse play in sports, such as in a soccer kick?
Impulse increases the speed and distance of the soccer ball during a kick.
Impulse has no effect on the distance of the soccer ball.
Impulse only affects the player's energy, not the ball's movement.
Impulse decreases the speed of the soccer ball during a kick.
13. How do you calculate the total momentum of a system of particles?
Total momentum is the difference between the momenta of the fastest and slowest particles.
Total momentum is the average of the momenta of all particles.
Total momentum is calculated by multiplying mass and velocity of the heaviest particle only.
Total momentum is the sum of the momenta of all particles in the system.
14. What is the effect of external forces on the conservation of momentum?
External forces have no effect on momentum.
External forces only affect kinetic energy, not momentum.
Momentum is always conserved regardless of external forces.
External forces can change the total momentum of a system, violating momentum conservation.
15. Block A with a mass of 2.0 kg is moving to the right at 5.0 m/s. It collides with block B with a mass of 3.0 kg moving at 1.0 m/s to the left. What is the total momentum before the collision?
7.0 kg ⋅ m/s to the left
7.0 kg ⋅ m/s to the right
13 kg ⋅ m/s to the left
13 kg ⋅ m/s to the right
