Energy transformations TEST REVIEW

Which energy conversion takes place when a toaster is switched on?

• chemical to sound

• chemical to electrical

• electrical to thermal

• electrical to mechanical

Ty tossed a ball in the air and watches as it falls back to Earth. When does the ball only have potential energy.

• just before it hits the ground

• at the midway point

• at its highest point

• as it leaves her hand

A flower pot is sitting on the edge of a shelf 10 meters above the ground. What type of energy does it have?

Thermal energy is also known as

• light

• heat

• radiation

Which of these is chemical energy being converted to thermal energy

• steam condensing

• chocolate melting

• water boiling

• wood burning

Ms. West's science students were observing a demonstration with Newton's cradle, as shown in the diagram. They noticed that when the ball was raised and released on the left side, it hit the stationary balls, and its kinetic energy was transferred all the way to the last ball on the right, causing it to be propelled up. This action continued for a while, but as time went on, the balls did not go as high, and eventually stopped.

Why did the balls eventually stop moving?

• Energy is lost due to the conservation of energy

• Energy is transformed from electrical to potential and energy was transferred to chemical energy.

• Energy is transformed from potential to kinetic and energy is transferred due to air resistance and friction.

• Energy is transformed from chemical to light and energy was transferred to heat energy.

Using your knowledge of the Law Conservation of Energy, which statement below describes why a roller coaster eventually slows and then comes to a stop.

• The roller coaster lost all of its potential and kinetic energy

• The roller coaster lost its kinetic energy

• The roller coaster gained thermal and sound energy

• The roller coaster converted its potential and kinetic energy into thermal and sound energy

Which letter shows the maximum kinetic energy

• C

• E

• B

• D

Amber likes riding her bicycle through her neighborhood where there are lots of hills. She rides down a very steep hill, and then goes up a small hill. She doesn't need to pedal as her bicycle carries her up the small hill. How do Amber's kinetic energy and potential energy change as she goes uphill?

• Her kinetic and potential energy both increase

• Her kinetic and potential energy both decrease

• Her kinetic energy decreases and her potential energy increases.

• Her kinetic energy increases and her potential energy decreases

A student discovers that the battery in his calculator is no longer working. Which of the following is true?

• When the battery stops working all energy is used up by the battery

• The energy from the battery has all been transferred within the system or to another system

• The battery needs to be moved by a orce over distance in order to get more energy

• The battery must create more energy before it can be used again