chapter 6 physics

In a two body collision a. momentum is conserved b. kinetic energy is conserved c. neither momentum or kinetic energy is conserved d. both momentum and kinetic energy are conserved

a

Two objects move separately after colliding, and both the total momentum and total kinetic energy remain constant. What kind of collision is it? a. perfectly elastic b. inelastic c. perfectly inelastic

a

Two objects with different masses collide and bounce back after an elastic collision. Before the collision, the two objects were moving at velocities equal in magnitude but opposite in direction. After the collision a. the less massive object had gained momentum b. the more massive object had gained momentum c. both objects had the same momentum d. both objects lost momentum

a

A 75 kg person walking around a corner bumps into an 80 kg person who was running around the same corner. The momentum of the 80 kg person a. increases b. decreases c. remains the same d. is conserved

b

The change in an objects momentum is equal to a. the product of the mass of the object and the time interval b. the product of the force applied to the object and the time interval c. the time interval divided by the net external force d. the net external force divided by the time interval

b

Two skaters stand facing each other. One skater's mass is 60 kg, and the other's mass is 72 kg. If the skaters push away from each other without spinning, a. the 60 kg skater travels at a lower momentum b. their momenta are equal and opposite c. their total momentum doubles d. their total momentum decreases

b

Which of the following best describes the momentum of a system after a two body collision if the kinetic energy of the system is conserved? a. It must be less b. It must also be conserved c. It might also be conserved d. It is doubled in value

b

A billiard ball collides with a stationary identical billiard ball in an elastic head on collision. After the collision, which is true of the first ball? a. It maintains its initial velocity b. It has one-half its initial velocity c. It comes to rest d. It moves in the opposite direction

c

A force is applied to stop a moving shopping cart. Increasing the time interval over which the force is applied a. requires a greater force b. has no effect on the force needed c. requires a smaller force d. requires the same force

c

A rubber ball moving at a speed of 5 m/s hits a flat wall and returns to the thrower with the same speed. The magnitude of the momentum of the ball a. increases b. decreases c. remains the same d. was not conserved

c

If a force is exerted on an object, which statement is true? a. A large force always produces a large change in the objects momentum b. A large force produces a large change in the objects momentum only if the force is applied over a very short time interval c. A small force applied over a long time interval can produce a large change in the objects momentum d. A small force produces a large change in the objects momentum

c

When comparing the momentum of two moving objects, which of the following is correct? a. The object with the higher velocity will have less momentum if the masses are equal b. The more massive object will have less momentum if its velocity is greater c. The less massive object will have less momentum if the velocities are the same d. The more massive will have less momentum if the velocities are the same

c

Which of the following statements best describes the kinetic energy of the system after a two body collision if the momentum of the system is conserved? a. It must be less b. It must also be conserved c. It might also be conserved d. It is doubled in value

c

In an elastic collision between two objects with unequal masses a. the total momentum of the system will increase b. the total momentum of the system will decrease c. the kinetic energy of one object will increase by the amount that the kinetic energy of the other object decreases d. the momentum of one object will increase by the amount that the momentum of the other object decreases

d

Momentum is conserved a. in inelastic collisions b. in elastic collisions c. in head on collisions d. all of the above

d

The law of conservation of momentum states that a. the total initial momentum of all objects interacting with one another usually equals the total final momentum b. the total initial momentum of all objects interacting with one another does not equal the total final momentum c. the total momentum of all objects interacting with one another is zero d. the total momentum of all objects interacting with one another remains constant regardless of the nature of the forces between the objects

d