Energy

As a moving object slows down, its energy of motion ...

• is zero

• decreases

• increases

• stays the same

How does energy change when a player kicks a soccer ball to score a goal?

• The ball loses energy.

• Neither the ball nor the player's foot gains energy.

• The ball gains the most energy.

• The player's foot gains the most energy.

Four runners are in a race. What can you infer about the runner who crosses the finish line first?

• The runner had the most energy.

• The runner had the slowest speed.

• The runner had the longest legs.

• The runner had the shortest distance to run.

What happens when a tennis player hits the ball over the net with her racquet?

• The ball's energy and motion change.

• The net gains some energy as the ball passes over it.

• All the ball's energy transforms to sound energy.

• All the racquet's energy transforms to sound energy.

Some of the energy transferred during a collision can produce ___________.

• heat

• sound

• both heat and sound.

You pack a flashlight for your camping trip. In terms of energy, what will the flashlight help you do?

• It will change electrical energy to sound energy.

• It will change energy from the battery to light energy.

• It will change energy from the battery to motion energy.

A player catches a moving ball. What happens to some of the ball's energy when it hots the player's mitt?

• It changes to light energy.

• It changes to electrical energy.

• It changes to sound energy.

You spill some sugar on the kitchen table. You pound your fist on the table, and the sugar moved. Why did the sugar move?

• The spilled sugar transferred energy to the table.

• Heat from your fist transferred energy to the sugar.

• The air around the table transferred energy to the sugar.

• Vibrations made by your hand pounding transferred energy to the sugar.

Rubber allows electrical energy to flow through a current.

• True

• False

What is an electric current?

• a flow of electricity

• a group of magnets

• a collision of objects

• a mix of heat and sound