PHYSICS 5-1 MOMENTUM BASICS 3

A 1,200-kilogram car traveling at 10 meters per second hits a tree and is brought to rest in 0.10 second. What is the magnitude of the average force acting on the car to bring it to rest?

• 1.2 × 10² N
• 1.2 × 10³ N
• 1.2 × 10⁴ N
• 1.2 × 10⁵ N

In the diagram below, a 60-kilogram roller skater exerts a 10-newton force on a 30-kilogram roller skater for 0.20 second.
What is the magnitude of the impulse applied to the 30-kilogram rollerskater?

• 50 N∙s 
• 2.0 N∙s 
• 6.0 N∙s 
• 12 N∙s

Two carts are pushed apart by an expanding spring, as shown in the diagram below.
If the average force on the 1-kilogram cart is 1 newton, what is the average force on the 2-kilogram cart?

• 1 N
• 0.0 N
• 0.5 N
• 4 N

What is the speed of a 1.0 × 10³ -kilogram car that has a momentum of 2.0 × 10⁴ kilogram∙meters per second east?

• 5.0 × 10^-2 m/s
• 2.0 × 10¹ m/s
• 1.0 × 10⁴ m/s
• 2.0 × 10⁷ m/s

A motorcycle being driven on a dirt path hits a rock. It’s 60-kilogram cyclist is projected over the handlebars at 20 meters per second into a haystack. if the cyclist is brought to rest in 0.50 second, the magnitude of the average force exerted on the cyclist by the haystack is

• 6.0 × 10¹ N
• 5.9 × 10² N
• 1.2 × 10³ N
• 2.4 × 10³ N

Which situation will produce the greatest change of momentum for a 1.0-kilogram cart?

• accelerating it from rest to 3.0 m/s
• accelerating it from 2.0 m/s to 4.0 m/s
• applying a net force of 5.0 N for 2.0 s
• applying a net force of 10.0 N for 0.5 s

Which is a scalar quantity?

• acceleration
• momentum
• speed
• displacement

A force of 6.0 newtons changes the momentum of a moving object by 3.0 kilogram∙meters per second. How long did the force act on the mass?

• 1.0 s
• 2.0 s
• 0.25 s
• 0.50 s

Cart A has a mass of 2 kilograms and a speed of 3 meters per second. Cart B has a mass of 3 kilograms and a speed of 2 meters per second. Compared to the inertia and magnitude of momentum of cart A, cart B has 

• the same inertia and a smaller magnitude of momentum 
• the same inertia and the same magnitude of momentum
• greater inertia and a smaller magnitude of momentum
• greater inertia and the same magnitude of momentum