6 Easy Physics Questions!!! 1.)What is true about conservation of momentum? A.)M

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6 Easy Physics Questions!!!

1.)What is true about conservation of momentum?

A.)Momentum is conserved as long as it is completely isolated from all external forces.

B.)Momentum is conserved as long as the system's total mechanical energy is constant.

C.)Momentum is conserved as long as the system is subject to a conservative force.

D.)Momentum is conserved as long as the system is subject to a nonconservative force.

2.)A boy and a girl are sitting each on a wheeled chair. The boy has more mass than the girl. She pushes against the boy's chair and moves away from him with a certain velocity. What can you say about the final velocity of the boys.

A.)It will be larger than the girl's velocity since she's the one who pushed him.

B.)It will be smaller than the girl's velocity because he has a larger mass.

C.)It is zero since he didn't do any pushing.

D.)It is zero because he has a larger mass

3.)A firework explodes in two dimensions sending out two fragments. How would you solve the problem of determining the velocity of one of the fragments given the mass of both and the velocity of the other?

A.)Write down the equation of conservation of momentum with the initial momentum equal to zero.

B.)Break the problem into velocity components of each fragment along the x and y directions.

C.)Express the final velocity in terms of x and y velocity components.

D.)All of these answers needed to solve the problem.

4.)What is the difference between perfectly inelastic and perfectly elastic collisons?

A.)Perfectly inelastic collisions conserve energy but perfectly elastic collisions do not.

B.)Perfectly inelastic collisions conserve momentum but perfectly elastic collisions do not.

C.)Perfectly elastic collisions conserve energy but perfectly inelastic collisions do not.

D.)Perfectly elastic collisions conserve momentum but perfectly inelastic collisions do not.

5.)A moving car collides with a stationary car. The collision is perfectly inelastic. What can you say about the final velocities?

A.)The moving car will come to a standstill and the initally stationary car will have a net velocity.

B.)The moving car will bounce off the stationary car.

C.)Both cars will stick together and have the same velocity.

D.)The initially moving car will have a smaller velocity than the initally stationary car.

6.)A billiard ball with an inital velocity hits a stationary ball. The collision is perfectly elastic. Both have the same mass. What can you say about the balls' velocities?

A.)Both balls will stick together and have the same velocities.

B.)The moving ball will come to a standstill and the stationary ball will acquire a velocity equal to the first ball's

C.)The moving ball will bounce off the stationary ball with a negative but equal magnitude velocity compared to the initial velocity.

D.)After the collision the moving ball will have half of its original velocity and the stationary ball will have a velocity twice the initial moving ball's.

Explanation / Answer

1 A

2..B

3.D

4. C

5. C

6. B

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