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

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 1000 kg truck crashes into a wall at 10 m/s and comes to a stop in 0.4 seconds. Find the truck's change in momentum.

• -10,000 kg m/s
• 10,000 kg m/s
• -2500 kg m/s
• 400 kg m/s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

The purpose of crumple zones on a car is to

• decrease time of impact.
• increase force of impact.
• increase the time of impact.
• decrease the impulse during impact.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-3

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

Tags

NGSS.HS-PS2-1

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

Tags

NGSS.HS-PS2-2

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

Tags

NGSS.HS-PS2-1

How much momentum does a stationary battle ship have if it has a mass of 2,575,000 kg?

• 2,575,000 N
• 2,575,000 kg m/s
• 0 Momentum requires mass and velocity
• none of the above

A .030 kg bullet is fired from a gun with a speed of 283 m/s. If the gun has a mass of 0.9 kg, What is the recoil speed of the gun?

• 14.3 m/s

• 4.52 m/s

• -9.43 m/s

• 10.2 m/s

Two skaters begin at rest. Skater 1 has a smaller mass than Skater 2. After they push off each other,...

• Skater 1 experiences a greater change in momentum
• Skater 2 experiences a greater change in momentum
• Skater 1 has a greater velocity than Skater 2
• Skater 1 experiences a greater force

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2