Quiz on work and energy

Work is done when:

• the object you apply a force on is displaced

• any force is applied to an object, regardless of whether it moves

• the force is zero

• the force and direction of motion are perpendicular

If the net work done on an object is positive, what can you conclude about the object's motion?

• The object is speeding up.

• The object is moving with a constant velocity.

• The object is slowing down.

• The object is at rest; its position is constant.

if you push a cart with a force of 60 N resulting in 120 J of work, how far did you move the cart? 

• 7200 m

• 0 m

• 2 N 

• 2 m

The ability to do work is called:

• energy

• force

• power

• machine

What is the unit of energy called?

• Joules

• meters

• newtons

• grams

Which has MORE kinetic energy?

a 2 kg ball moving at 2 m/s

a 1 kg ball moving at 4 m/s

• The 2 kg ball

• The 1 kg ball

• They have the same KE

• There is no way of knowing

When you rub your hands together on a cold day, you use friction to convert:

• Mechanical energy into thermal energy

• Thermal energy into nuclear energy

• Nuclear energy into electrical energy.

• Electrical energy into radiant energy

Energy stored due to the interactions between objects

• potential energy

• positional energy

• total energy

• kinetic energy

What does the Law of Conservation of Energy state?

• Energy cannot be created or destroyed

• Nothing can exchange energy

• Energy will increase over time

• Energy will decrease over time

At which point on the roller coaster is the kinetic energy at its maximum?

• A

• B

• C

• D