Force, Work, and Energy

What is the force that opposes the motion of an object?

• Momentum

• Gravity

• Inertia

• Friction

Explain the law of conservation of energy.

• Energy can only exist in one form

• Energy can be created out of nothing

• Energy can be destroyed but not created

• Energy can neither be created nor destroyed, only converted from one form to another.

How can you determine if work is done on an object?

• Ask the object if it feels any different

• Check if the object is stationary

• Look at the color of the object

• Check if a force is applied to the object and if the object moves in the direction of the force.

Name two types of potential energy.

• Nuclear potential energy

• Chemical potential energy

• Gravitational potential energy, Elastic potential energy

• Thermal potential energy

What is the unit of energy?

• Watt (W)

• Joule (J)

• Volt (V)

• Newton (N)

Give an example of kinetic energy.

• moving car

• motionless tree

• sleeping cat

• stationary rock

Explain the difference between renewable and non-renewable energy sources.

• Renewable energy sources are always available, while non-renewable sources are limited

• Renewable energy sources are more expensive than non-renewable sources

• Non-renewable energy sources are better for the environment than renewable sources

• Renewable energy sources can be replenished naturally, while non-renewable energy sources cannot be replenished in a short period of time.