Physics Energy and Work Test Review

How much work is done on a 20 -N rock bag you carry horizontally to your room, 5 meters long.

• 5 J

• 10J

• 0 J

• 100J

How much work is done lifting 2 boxes of equal mass up a flight of stairs verses 1 of the boxes?

• The same amount

• Twice as much than lifting 1 box

• Half as much as lifting one box

• Less than lifting 1 box

A marshmallow shooter has 50 J of potential energy. Assuming no loss of energy to heat, how much kinetic energy will the marshmallow have after you launch it?

• 0J

• 25J

• 50J

• 100J

A frictionless inclined plane is used for a ramp for a building. The ramp is 10 meters long and 3 meters high at the door. How much force is needed for a wheelchair weighing 90 N to go up the ramp? Remember, that work accurs when a component of force and distance are in the same direction. In the image, you can ignore friction.

• 90N

• 30N

• 900N

• 300N

Answer explanation

Since there is a component of force in the direction up the ramp, there is work being done on the block.

How many joules of work are done on an object with a force of 20N for a distance of 5 m?

• 1000 J

• 100J

• 1000N

• 100N

Work on an object divided by the time it takes to do work is called _______?

• force

• work

• energy

• power

What word describes force being applied over a distance?

• force

• work

• energy

• power

An object that is moving has ________?

• Potential Energy

• Kinetic Energy

An object has Potential Energy based on its ________.

• speed

• density

• location

• force

An object that has momentum also has _________________.

• Potential Energy

• Kinetic Energy