Energy Works

When an object is held in the air, it has stored energy. When the object is released and begins falling, it experiences __________.

• . electrical energy

• transferred energy

• motion energy

• collision energy

Match each appliance below with the energy transformation it performs.

• electrical> mechanical and sound

• Blender

• electrical> sound and light

• Oven

• electrical> sound

• TV

• electrical> heat

• Stereo

Match each action below with the energy transformation that makes it happen.

• chemical  mechanical

• A guitar string vibrates

• mechanical  mechanical

• A streetlight absorbs during the day and glows at night

• mechanical  sound

• A tennis player uses food energy to play a match

• solar  light

• A wind-up toy moves

A bike, a truck, and a train—all without passengers, motors, or engines—roll down the same hill. Put the vehicles in order from the least amount of motion energy to the most.

• Train

• Bike

• Truck

Consider the scenario in Question 4. Imagine that the truck collides with a stationary car at the bottom of the hill. Which of the following is likely to happen?

• When the truck and car collide, they move in opposite directions.

• When the truck and car collide, the car is pushed and begins moving and the truck slowly comes to a stop.

• When the truck and car collide, the truck rolls over the car and keeps moving

• When the truck and car collide, the car does not move and the truck comes to a stop.

6. Based on the outcome of the collision described in in Question 5, describe the energy transfer that occurred between the truck and the car.

Sound moves in waves. If a sound is played on repeat, which of the following statements is true?

• The sound waves will increase in frequency over time

• The sound waves will follow the same pattern over time.

• The sound waves will be heavier over time.

• The sound waves will lose energy over time.

An engineer is trying to build a car that does not use fossil fuels or chemical energy to move. What do you suggest the engineer use to power the car?

• Solar panels

• . Gasoline

• Lightbulbs

• Batteries

Explain how tumbling dominoes is an example of both an energy transfer and an energy transformation.

You are racing a toy boat across a pond. Which type of wave would cause the boat to move the fastest?

• Waves with a short frequency

• Waves with a high frequency

• Waves with a small amplitude

• Waves with a long wavelength