In Physics / Junior High School | 2025-08-07

1. Which statement is false about the momentum of an object?
A) Momentum is a scalar quantity.
B) Momentum is not the same as kinetic energy.
C) Momentum is not always conserved in collisions.
D) Momentum depends on the mass and velocity of an object.

2. What happens to the total kinetic energy of a closed system during an elastic collision?
A) It increases.
B) It decreases.
C) It remains constant.
D) It varies
3. Which of the following best describes impulse?
A) Impulse is the change in kinetic energy.
B) Impulse is the product of force and time.
C) Impulse is the force acting on an object.
D) Impulse is the product of mass and acceleration.

4. During an elastic collision, which of the following is conserved?
A) Kinetic energy
B) Momentum
C) Both momentum and kinetic energy
D) Neither momentum nor kinetic energy

5. A truck and a car collide head-on and stick together. Which of the following statements is
true?
A) Only the truck’s momentum is conserved.
B) Only the car’s momentum is conserved.
C) The total momentum before and after the collision is the same.
D) The kinetic energy before and after the collision is the same.

6. Which of the following scenarios involves an inelastic collision?
A) Two cars crashing and moving in different directions.
B) A car hitting a wall and coming to a stop.
C) A lump of clay hitting the ground and not bouncing.
D) A ball bouncing back to its original height after hitting the ground.

7. How does decreasing the duration of the collision affect the force experienced by an object?
A) It increases the force.
B) It decreases the force.
C) It does not change the force.
D) It depends on the mass of the object.

8. Which of the following is an example of an impulse?
A) A baseball bat hitting a ball.
B) A car moving at constant speed.
C) A book resting on a table.
D) A ball rolling down a hill.

9. If two objects collide and bounce apart with no loss of kinetic energy, the collision is described as:
A) Inelastic B) Perfectly inelastic C) Elastic D) Super elastic

10. Which of the following statements best describes the law of conservation of momentum?
A) The total momentum of a closed system is always zero.
B) The total momentum of a closed system is always conserved.
C) The total momentum of a closed system changes unless external forces act on it.
D) The total momentum of a closed system is always conserved in elastic collisions only.

Asked by nigellacarreon