Conservations

Which of the following has the MOST momentum?

• rolling ping-pong ball

• rolling bowling ball

• rolling soccer ball

• rolling basketball

If an object has a momentum of 40 kgm/s and a mass of 60 kg, what is it's velocity?

• 2400 m/s

• 1.5 m/s

• 240 m/s

• .67 m/s

An object has a mass of 5 kg, a displacement of 5 m, and a time of 25 s, what is its momentum?

• 1 kgm/s

• 750 kgm/s

• 25 kgm/s

• 625 kgm/s

All of the following are examples of impulse except..

• A car moving with constant speed

• A tennis ball hitting a racket

• A pencil getting stuck to the ceiling

• A hammer bouncing of a nail

A baseball bat applies a force of 500 N to a ball for 0.1s. What was the impulse on the ball?

• 5 N . s

• 500 N .s

• 500 N/s

• 50 N.s

A 5 N force is applied to a 3 kg ball to change its velocity from +9 m/s to +3 m/s. The impulse on the ball is ______ N s.

• -2.5

• -10

• -18

• -45

A constant force of 4.5 N acts on a 7.2-kg object for 10.0 s. What is the     change in the object's velocity? 

• 6.3 m/s
• 3.2 m/s
• 1.2 m/s 
• 4.33 m/s

500 J of work is done by a person who uses a force of 50N to move a box, how far does it go?

• 10 m

• 0.1 m

• 25,000 m

• 10 J

_____________ is the rate of doing work.

• Conservation of energy

• Joules

• Energy

• Power

What is the mass of a moving object that has 100 Joules of KE and moves at a velocity of 2 m/s?

• 50 kg
• 200 kg
• 25 kg
• 100 kg