Science 12/7 - Energy

An ice cube is placed in a glass of warm tea. Later, the ice has melted, and the tea is cooler. What is true about the transfer of energy?

• Heat has been transferred from the ice cube to the warm tea.

• Light energy from the warm tea has been transferred to the ice cubes.

• Heat from the warm tea has been transferred to the ice cubes and the glass.

• Electrical energy has been transferred from the tea to the surrounding air and glass.

Which of these is an example of how heat can transfer by touching an object?

• the sun heating a pond

• snow melting on a hot day

• a person keeping warm by a fire

• warming hands on a cup of hot chocolate

Through which of these materials do sound waves travel most slowly?

• air

• iron

• wood

• water

Which form of energy results from vibrations that travel through air?

• sound energy

• potential energy

• electrical energy

• chemical energy

Which device converts electrical energy to light?

• lamp

• radio

• battery

• solar panel

Alonzo has a battery operated toy car. When he turns it on it moves across the floor. Which energy transformation happens in the toy car?

• sound energy to stored energy to electrical energy

• electrical energy to stored energy to motion energy

• motion energy to electrical energy to sound energy

• stored energy to electrical energy to motion energy