Momentum and Impulse

Which TWO variables determine the MOMENTUM for an object?

• time

• density

• velocity

• mass

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 trampoline increases __________________, which in turn decreases _____________________.

• force / time

• time / force

• mass / weight

• acceleration / velocity

Action: Your foot applies a downward force onto the floor.

Reaction?

• Your foot pushes through the floor.

• The floor applies an equal and opposite force upward on your foot.

• Your foot bounces off of the floor.

• The floor collapses.

For every action, there is an equal and opposite reaction.

• Newton's 1st Law

• Newton's 3rd Law

• Newton's 2nd Law

• Law of Momentum

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

When the speed of an object is doubled, its momentum

• remains unchanged in accord with the conservation of momentum.
• doubles
• quadruples
• decreases

Softer landings tend to

• increase impact force
• increase force
• increase collision time
• increase change in 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

A 5 N force is applied to a 3 kg ball to change its velocity from +9 m/s to +3 m/s.  The time for the collision is _____ seconds.

• 1.8
  .
  .
• 2.5
• 3.6
• 10