The force that opposes the motion of two surfaces sliding past each other is called ___________.

• acceleration
• inertia
• friction
• unbalanced

What is the unit of force?

• Kilogram
• Meter
• Pascal
• Newton

Not all living things need energy to move, grow, and change.

• True
• False

Silver, copper, and aluminum are good examples of ______.

• thermal insulators
• thermal energy sources
• thermal conductors
• solar radiation

Which of the following statements about sound is NOT true?

• You can hear due to vibrations on your eardrum.
• Higher volume is due to using less energy.
• Volume is measured in decibels.
• Sound waves can be used in devices for safety.

_______ is an energy that is made of charged particles.

• magnet

• electricity

• magnetism

• insulator

Which of these items do you NOT need to complete an electric circuit?

• device to power on/off (like a light bulb)

• conductor (like wire)

• a switch

• power source (like a battery)

What is a wire in a circuit wrapped around an iron core called?

• electromagnet
• generator
• electric motor

Unlike poles of a magnet do what?

• repel
• attract
• nothing 

If a light bulb is added to a circuit and it turns on, what can we say about this circuit?

• open
• incomplete
• unbroken 
• off