Work, Power and Energy

Which situation below is work not being done ?

• lifting a box off the floor

• carrying a box of pizza across the room

• pushing a car that does not move

• pulling a sled across snow

What is the correct formula to use if calculating the amount of work done ?

• Work = distance / time

• Work = mass x velocity

• Work = force x distance

• Work = force / time

The metric unit for measuring the amount of work done is called the : (equivalent to a Newton-meter)

• Kilogram

• Crooke

• Watt

• Joule

The amount of work done over a given time period is called

• momentum

• efficiency

• energy

• power

The metric unit for measuring power is called the

• Watt

• Joule

• Crooke

• Riely

John and Bob weigh the same and both run up a flight of stairs. John reaches the top in 8 seconds while Bob follows in 10 seconds. Who has exhibited more power ?

• John

• Bob

• they both have the same amount of power

• not enough info is given to determine who has more power

Which of the following is a bigger unit to measure power ?

• the metric unit of the Watt

• the English unit of Horsepower

The ability to do work is called

• matter

• force

• energy

• impulse

Energy that is stored or held in readiness is called

• potential energy

• kinetic energy

• electromagnetic energy

• friction

Which of the following is an example of potential energy ?

• running down the street

• a falling rock

• water behind a dam

• a probe travelling through space