Study Guide I-7B Momentum

Law of Conservation of Momentum

The total momentum before a collision will equal the total momentum after a collision (event)

Unit for momentum

Kg m/s

(Kilogram meter per second)

If there are two carts with the same mass how would their change in velocities compare?

They would be about the same in opposite directions

If a cart had twice the mess as another cart how would their change in velocities compare?

The velocity of the lighter car will be twice as much as the heavier one, they will also be in opposite directions

Why would a cart with twice the mass as another cart have a different changes in velocity

Because the cart had twice as much mass as the other

What name would you give the product of mass and change in velocity?

Change in momentum (p)

During the lab, how was the momentum conserved in the investigation?

The carts moved in opposite directions with velocities inversely proportional to their masses

What is the pattern with the equation, F=m×∆v/t

Greater acceleration, longer time; less acceleration, shorter time

By making the time shorter there will be a greater force.

A girl with a mass of 60 kg, running with a velocity of 4.0 m/s, jumps onto a skateboard that has a mass of 5 kg. If the skateboard had a velocity of 3.0 m/s, and was already moving in the same direction as the girl, what would be the velocity of the girl in the skateboard together?

3.923 m/s

A car with a mass of 150 kg has a force of 300N applied to it for 60 seconds. What is the change of velocity for the car?

120 m/s