Types of Forces and Energy Transformations

Which energy transformation occurs when a match is lit?

• chemical to heat energy

• heat to potential energy

• electrical to heat energy

• kinetic to potential

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A girl threw a ball. As the ball moves through the air, what type of energy does it have?

• heat energy

• chemical energy

• electrical energy

• mechanical energy

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Energy that flows through an electrical circuit is ____________ energy?

• chemical

• electrical

• heat

• solar

A falling rock has kinetic energy. Where does that kinetic energy go when it hits the ground and stops?

• It is reduced until it disappears

• It is converted into potential energy again

• It is converted into heat and sound

• It is converted into matter

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Marcos has a new toy. When he plugs it in and turns it on, a marble is carries up to the top of the slide. At the top, the marble is released and it goes down the slide.

What kind of energy transformation occurs to make this toy work?

• chemical to heat

• electrical to chemical

• sound to electrical

• electrical to mechanical

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Beginning with the source of energy, explain the energy transformation that takes in this circuit.

• chemical to light to heat

• chemical to electrical to light

• light to electrical to chemical

• light to chemical to electrical

In an investigation, a ball was released from the three difference positions shown. The speed of the ball was measured at the bottom of the ramp, after the ball was released from each position.

Why was the speed greatest when the ball was released from the top position "1"?

• The ball lost energy to the environment as it rolled down the ramp.

• The ball had more potential energy at the top of the ramp.

• The ball gained potential energy as it rolled down the ramp.

• The ball had more kinetic energy at the top of the ramp.

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A student wound up a propeller in the toy plane shown. After he wound it up, he let it go.

What energy transformation occurred when he released the propeller?

• Gravitational potential energy transformed into kinetic energy.

• Elastic potential energy transformed into kinetic energy.

• Chemical kinetic energy transformed into spinning kinetic energy.

• Elastic kinetic transformed into spinning kinetic energy.

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Does all of the electrical energy produced by this battery transform into light energy?

• Yes; because of the Law of Conservation of Energy.

• No; because the mass of the battery changes.

• Yes; because light bulbs are light producing devices.

• No; because some of it transforms into heat energy.

A student wants to model how energy is conserved. She holds a book above the floor and explains that the book now has potential energy. She then drops the book.

What energy transformation occurs after she drops the book?

• It changes from potential to kinetic and back to potential.

• it changes from potential to kinetic to zero energy.

• It changes from potential to kinetic to sound and thermal.

• It changes from potential to kinetic to elastic.

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