Momentum, Impulse, Collisions, Work, Energy and Power

Which of the following quantities is most commonly used in sports?

 

• force

• impulse 

• momentum

• velocity

What can be concluded of an object whose mass stays constant but its momentum is changing?

• Its velocity is changing.  

• There is no velocity at all. 

• Its acceleration is changing.

• There is no force acting on it.

Jane, a skater who is moving at high speed needs a certain amount of force to stop her. When will more stopping force be needed with?

• less mass   

• less momentum

• less velocity   

• less stopping time

When two stationary objects are suddenly pushed by a spring between them, what happens to the total momentum of the system? Assume that no friction acts on the two objects.

• decreases

• increases  

• remains the same

• increases then decreases

The impulse experienced by an object is equivalent to its change in _______________.

• displacement 

• kinetic energy   

• momentum  

• velocity

A moving car hits an identical car at rest and move together afterwards. What can be concluded about the velocity of the first car before the collision as compared to the velocity of the combined cars after the collision?

• larger

• smaller

• the same  

• zero

Which of the following quantities is/are conserved during perfectly inelastic collision?

• kinetic energy

• momentum

• Both A and B

• Neither A nor B

Which of the following would NEVER happen in a perfectly inelastic collision?

• objects move in opposite directions

• objects stick together after collision

• objects are deformed to some degree

• objects move with a common velocity

Two billiard balls, each moving at 1 m/s, roll toward each other and collide. Suppose after bouncing apart, each moves at 2 m/s. The collision violates the conservation of _______________.

• momentum

• kinetic energy  

• both of these 

• none of these

Which of the following quantities is/are conserved during elastic collision?

• kinetic energy

• momentum

• both of these

• none of these