4/7 Physics

Which of the following has the greatest momentum?

• a scurrying cockroach

• a parked semi-truck

• more information is needed

A 50 kg ball rolls down the street at 5 m/s. Calculate the momentum of the ball. 

• 55 kg*m/s
• 100 kg*m/s
• 250 kg*m/s
• 500 kg*m/s

Parkour Peter bends his knees upon landing in order to ____

• reduce his change in momentum
• increase his change in momentum
• increasing his landing time
• increasing his landing force

The conservation of momentum means...

• The momentum before an event disappears after the event

• The momentum before and after the collisions are equal

• The momentum before an event increases after the event

• The momentum before and after an event changes

The units for Impulse are

• N/s
• N.s
• N
• m/s

Which has more momentum?

• A hummingbird zipping down the street (v = 1 m/s)

• A bus stopped at a stop sign

• A bus barreling down the road (v = 10 m/s)

• A hummingbird hovering at a feeder

A bicycle has a momentum of 24 kg•m/s. What momentum would the bicycle have if it had twice the mass and was moving at the same 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

The equation to calculate momentum is

• p=mv
• p=1/2mv²
• p=mgh
• p=mg

Which of the following has the smallest amount of momentum?

• A semi-truck traveling at highway speeds
• A college track athlete running a race
• A baby crawling on the floor
• A student sitting at a desk

The purpose of air bags on a car is to

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