Impulse and Momentum

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

Tags

NGSS.HS-PS2-1

The difference between a car hitting a wall vs. a car hitting a hay stack is

• the Impulse on the car hitting the wall is greater
• the change in momentum of the car hitting the wall is greater
• the force on the car hitting the hay stack is greater
• the collision time of the car hitting the hay stack is greater

Tags

NGSS.HS-PS2-2

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

Tags

NGSS.HS-PS2-2

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

In a physics experiment, two carts of mass 1.5 kg each are rolled towards each other.  The orange cart has a velocity of 2 m/s and the blue cart has a velocity of -1m/s.  The carts stick together when they collide.  Calculate their final speed.

• 0.5 m/s
• 1.0 m/s
• 0.33 m/s
• 0.67 m/s

Tags

NGSS.HS-PS2-2

While playing pool, the white cue ball strikes the 8 ball. Before the collision, the cue ball's velocity was 10 m/s and the 8 ball was at rest. If both ball's have a mass of 0.15 kg and the cue ball's velocity after the collision is 2 m/s, what is the 8 ball's velocity?

• 2 m/s
• 8 m/s
• -2 m/s
• 1.5 m/s

Tags

NGSS.HS-PS2-2

A 10kg toy truck moves at 5m/s East. It collides head-on with a 5kg toy car moving 10 m/s west. What is the total momentum of the system?

• 0 kgm/s

• 30 kgm/s

• 50 kgm/s

• 10 kgm/s

Under what conditions (if any) is the total momentum of a system conserved?

a. It is always conserved

b. It is conserved if the system is isolated from net external forces

c. It is conserved if the forces action on the system are conservative

d. It is never conserved

• a

• b

• c

• d

Tags

NGSS.HS-PS2-2

Two skaters stand facing each other on frictionless ice. One skater’s mass is 3 times the mass of the other. If the skaters push away from one another without spinning, how does the magnitude of momentum of the lighter skater compare to the heavy skater?

a.The lighter skater has more momentum

b. The lighter skater has less momentum

c. The skaters both have the same magnitude of momentum

d. Not enough information

• a

• b

• c

• d

A stunt person jumps from the roof of a tall building, but no injury occurs because the person lands on a large, air-filled bag. Which one of the following best describes why no injury occurs?

• The bag reduces the impulse to the person

• The bag increases the amount of time during which the momentum is changing and reduces the average force on the person

• the bag decreases the amount of time during which the momentum is changing and reduces the average force on the person

• The bag increases the amount of time the force acts on the person and reduces the change in momentum