Physical Science Unit 5 Review

In a gas-powered lawnmower, the gasoline is

converted from chemical energy into which other

type of energy?

• A. mechanical energy

• B. electrical energy

• C. nuclear energy

• D. light energy

Hydroelectric dams are often used to generate electrical energy. The energy of the water flowing over the dam is harnessed and transformed into electrical energy that can power appliances and other tools. What type of energy is transformed into electrical energy by hydroelectric dams?

• A. light energy

• B. sound energy

• C. thermal energy

• D. mechanical energy

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Megan and her brother are watching a television program. Megan notices that the television produces a lot of light. What else does the television produce?

• A. chemical energy

• B. heat energy

• C. particles of matter

• D. steam

Samantha's hands are cold and she wants to warm them up by rubbing them together. Samantha is using friction to convert

• A. thermal energy to mechanical energy.

• B. electrical energy to frictional energy.

• C. mechanical energy to thermal energy.

• D. frictional energy to electrical energy.

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Octavian is building a solar powered toy car. The car moves forward on the ground. Identify the parts of the system that transform energy and describe their role in the system.

• A. Solar panel: transforms light energy into electrical energy Motor: transforms electrical energy into mechanical energy

• B. Switch: transforms light energy into electrical energy Wheels: transform electrical energy into mechanical energy

• Switch: transforms light energy into chemical energy Wires: transform chemical energy into electrical energy

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The pictures show four household items that transform energy. Which picture shows the transformation of electrical energy into mechanical energy?

• A. Q

• B. R

• C. S

• D. T

The picture below shows a water wheel powering a house. How does the water wheel make electricity?

• A. The force of the wheel turning pulls down the water and turns into electricity.

• B. The force of sound made by the water pushes the wheel and turns into electricity.

• C. The force of the water turns the wheel and makes energy that can be made into electricity

• D. The force of the Sun pushes the wheel around and makes energy that can be made into electricity.

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Which statement is the best example of the law of conservation of energy?

• A. A train traveling down a hill loses potential energy that is then stored in the ground.

• B. An animal's energy is permanently stored in chemical bonds when it eats food.

• C. Chemical energy in a car engine is destroyed as it burns and releases exhaust into the air.

• D. Radiant energy from the Sun is not lost but transformed into other forms of energy.

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Which situation best demonstrates the law of conservation of energy?

• A. ice water transforming into liquid water when it absorbs heat energy

• B. batteries being able to store potential energy over a long period of time

• C. a long distance runner conserving her energy to sprint at the end of the race

• D. the potential energy of a ball being dropped from a cliff being converted to kinetic energy

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Carlos made a mistake on his list. Which mistake did he make?

• A. Radiation can also travel through matter.

• B. The rate of conduction is only dependent on time.

• C. Currents in the ocean are an example of radiation.

• D. Convection is also caused by electromagnetic waves.

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