Energy Practice 1

Which statement most accurately describes the Law of Conservation of Energy?

• Energy can not be created or destroyed but it can change from one type to another.

• Energy is created from the Earth and is destroyed when we use it.

• Energy should be saved (conserved) for use in the future.

• All forms of energy can be classified as either potential or kinetic.

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What energy transformation takes place when water flows downhill and causes a turbine to rotate in a hydroelectric dam?

• kinetic to potential

• electrical to sound

• gravitational potential to kinetic

• kinetic to electrical

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Which of the following is an example of chemical energy being transformed into thermal energy?

• A light is switched on

• A ball drops

• A match is burned

• An electric fire is switched on

Heating an object to a higher temperature increases that object’s:

• thermal energy

• potential energy

• kinetic energy

• chemical energy

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Energy from the Sun reaches the Earth through a type of energy transfer known as:

• conduction

• convection

• radiation

• absorbtion

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 to elastic.

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

• It changes from potential to kinetic to zero energy.

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

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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.

Does the car have more potential mechanical energy at point B or D?

• D, because the height is greater.

• D, because it will be going faster.

• B, because it will be going faster.

• B, because the height is less.

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