Semester 1 review

The momentum of an object depends on the objects ________ & ______________

• size and shape

• mass and acceleration

• force and velocity

• mass and velocity

In any collision, _____________ is always conserved.

• energy

• momentum

• force

• the spanish inquisition

A 50 kg ball rolls down the street at 5 m/s. What is the ball's momentum?

• 55 kg m/s

• 100 kg m/s

• 250 kg m/s

• 500 kg m/s

. 

A 2.5 kg ball moving at 5 m/s collides with a 2.5 kg stationary ball in a perfectly elastic collision.  What is the velocity of the second ball after the collision? 

• 5 m/s

• 2.5 m/s

• 10 m/s

• 7.5 m/s

What is impulse equal to?

• An object's force

• the change in momentum of an object

• The change in energy of an object

• A change in velocity

Which has undergone the greatest impulse?

• an egg falling onto the ground

• An egg falling into a blanket

• they are equal

What type of collision is described by an elastic collision?

• The objects stay separate after the collision

• The objects stick together after the collision

• The object continues moving in the same direction

• The object's KE drops

What does the conservation of mass state?

• The amount of energy in a closed system dissipates over time

• The amount of energy in an open system is constant

• The amount of energy in a closed system is constant and it only transforms forms

• Energy is a thing

An stationary object has 20 J of energy as it rolls down a ramp. How many joules of energy will it have at the bottom right before it hits the ground?

• 0 J

• 10 J

• -20 J

• 20 J

An stationary object has 20 J of energy as it rolls down a ramp. How many joules of energy did it have at the top of the ramp?

• 0 J

• 20 J

• -10 J

• Not enough information given