Momentum

A 0.250 kg cart moving at 0.400 m/s has how much momentum?

• 0.1 kg-m/s
• 1 kg-m/s
• 10 kg-m/s
• 100 kg-m/s

The momentum of an object depends upon the object's ___________&_____________.

• size and shape

• mass and speed

• mass and veloctiy

• mass and energy

A runner has a momentum of 670 kg m/s and is travelling at a velocity of 9 m/s. What is his mass?

• 6030 kg
• 0.0134 kg
• 74.4 kg
• 80 kg

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 40-kilogram mass is moving across a horizontal surface at 5.0 m/s.  What is the magnitude of the net force required to bring the mass to a stop in 8.0 seconds?

• 1 N
• 40 N
• 25 N
• 5 N

The impulse-momentum theorem states that

• the impulse on an object is equal to the change in momentum it causes 
• the force on a moving object is equal to the magnitude of the impulse.
• the impulse on an object is greater than the change in momentum it causes 
• the impulse on an object is less than the change in momentum it causes

When the speed of an object is doubled, its momentum...

• remains unchanged in accord with the conservation of momentum.

• doubles.

• quadruples.

• decreases.

A boy kicks a football with a force of 20 N, the time the force acts for is 0.3 s.

Calculate the impulse on the ball.

• 1 N·s

• 6 N·s

• 66 N·s

• None of these

A bicycle has a momentum of 24 kg•m/s. What momentum would the bicycle have if it had the same mass and was moving with one-half the speed?

• twice the momentum; 48 kg*m/s

• 1/2 the momentum; 12 kg*m/s

• 4x the momentum; 96 kg*m/s

• 1/4 the momentum; 6 kg*m/s

A 2 kg cart has a momentum of 16 kg m/s. What is its velocity?

• 8 m/s

• 32 m/s

• 0.125 m/s

• 18 m/s