Change in Momentum and Force

A biker with a mass of 75 kg moves along the path with a constant velocity of 5 m/s. What is the biker's momentum?

• 25 m/s
• 375 m/s
• 25 kg m/s
• 375 kg m/s

A runner has a momentum of 670 kg m/s and is traveling 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 slow it down from 9 m/s to 3 m/s. What is the impulse on the ball?

• -2.5 N⋅s

• -10 N⋅s

• -18 N⋅s

• -45 N⋅s

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

• 33.3 N⋅s

A 2kg object moving at 5 m/s encounters a 30 N resistive force over a duration of 0.10 seconds. The impulse experienced by this object is _____

• 0.30 N*s

• 2 N*s

• 2.5 N*s

• 3 N*s

• 7 N*s

A boy kicks a football with a force of 20 N in 0.3 s.
Calculate the impulse on the ball.

• 1 N.s
• 6 N.s
• 66 N.s 
• None of these

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 velocity of a 975-kg car is changed from 12.0 m/s to 27.0 m/s in 15s by an external, constant force. What is the magnitude of the force? 

• 9.75×10² N
• 1.46×10⁴ N
• 9.75×10³ N
• 975 kg·m/s

If an air bag changes a 60 kg person's speed from 40.0 m/s to 0.0 m/s, what impulse must act on the person?

• 2400 kg.m/s

• 1.5 kg.m/s

• 0.67 kg.m/s

• 1500 kg.m/s

The force acting on a 4.00 kg object changes with time according to the graph shown below. What is the change in momentum of the object between t=1.0s and t=3.0s ?

• 8.0 kg.m/s

• 9.0 kg.m/s

• 12 kg.m/s

• 18 kg.m/s