Forces and energy

True or False. The density of an object is its mass divided by its volume.

• True

• False

The words heat and temperature have different meanings.

• True

• False

When you hold an ice cube, cold is transferred from the ice into your hand.

• True

• False

Conduction of heat occurs better in solids than in gases.

• True

• False

Energy cannot be created or destroyed, and energy cannot be changed or transferred.

• True

• False

Which of these has the lowest density?

• solid

• liquid

• gas

Marcuse has four blocks, A - D, each made from a different type of wood. All four blocks have the same volume. The masses of the blocks are in the list. Which block has the greatest density?

• 50 g

• 76 g

• 32 g

• 68 g

Zara has four pieces of metal, each made from a different type of metal. All four pieces have the same mass. The volumes of the pieces are in the list. Which piece of metal has the greatest density?

• 22 cm3

• 35 cm3

• 19 cm3

• 27 cm3

Which of these statements describes density?

• the weight of a substance

• the volume that a substance occupies

• the mass of a certain volume of substance

• the volume of a certain mass of substance

Float in both engine and in water.

• polyethylene

• polypropylene

• cellulose acetate

• polyvinyl chloride