Law of Conservation of Momentum (Collisions)

Collisions happen when two objects hit each other and the transfer of _________ and _________ occurs.

• kinetic energy and impulse

• momentum and kinetic energy

• momentum and impulse

• momentum and inertia

A 2000-kg truck moving a speed of 5 km/h collides with a 1000-kg car that is parked . The two vehicles stick together and move with the same velocity after the collision. Determine the type of collision and the post-collision velocity of the car and truck. (Be careful with the unit.)

• 3.33 km/h

• 3.33 m/s

• 33 km/h

• 33 m/s

When objects collide, the net momentum before is _____ to the net momentum after.

• equal

• not equal

• opposite

• in the same direction

The two types of collisions are

• elastic, inelastic

• elastic, impulse

• inelastic, momentum

• inelastic, impulse

In elastic collision what are conserved?

• kinetic energy, momentum

• potential energy, momentum

• kinetic energy, velocity

• potential energy, velocity

What is/are conserved in inelastic collision?

• kinetic energy

• momentum

• kinetic energy, momentum

• kinetic energy , impulse

The Law of Conservation of Momentum states that momentum is conserved. This means that the net momentum of the system is equal to _______________.

• zero

• twice the momentum before

• half the momentum before

• twice the momentum after

In the real world, there is no perfectly elastic collision because of forces that come into play. Choose all that apply .

• friction

• air resistance

• gravity

• tension

• magnetic

The type of collision that objects stick together is . . .

• elastic

• inelastic

A 3000-kg truck moving with a velocity of 5 m/s hits a 1200-kg parked car. The impact causes the 1200-kg car to be set in motion at 3 m/s. Assuming that momentum is conserved during the collision, determine the velocity of the truck after the collision.

• 3.8 m/s

• 2.4 m/s

• 4.0 m/s

• 2.0 m/s