Test- chp 4 Work and Energy

Which unit is used to measure work?

• Watts
• Meters
• Newtons
• Joules

Kilogram is a metric unit used to measure

• weight
• mass
• power
• force

Which unit is used to measure power?

• Liters
• joules
• Watts
• Pounds

Which unit is used to measure force?

• Joules
• Pounds
• Meters
• Newtons

Which unit is used to measure distance?

• Kilogram
• Meter
• Newtons
• Watt

What is the unit for measuring how much energy is in foods?

• Calories
• Kilograms
• Newtons
• Watts

Why is no work done when you hold a book steady over your head?

• The book is not moving
• The book is not heavy
• No muscles are being used
• Trick question; you are doing work.

Work requires both

• Distance and speed
• Force and distance
• Mass and time
• Mass and volume

A machine can change

• The amount of force needed
• The direction of a force
• Both the amount of force needed and direction of a force

A machine that does work with no movement or only one movement of the machine is called a

• Factory
• Compound machine
• Simple machine
• Combustion engine