6.PS3.2 Do Now

Potential energy that depends on height is called

• kinetic energy

• gravitational potential energy

• elastic potential energy

• mechanical energy

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NGSS.MS-PS3-2

What happens when a force exerted on an object causes the object to move?

• Potential energy is created.

• Kinetic energy is created.

• Work is done on the object.

• The object's energy is destroyed.

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A soccer ball that has just been kicked and is rolling across a flat field has

• no mechanical energy.

• kinetic energy only.

• elastic potential energy only.

• gravitational potential energy only.

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Mia usually has toast with her breakfast, so she places a slice of bread into the toaster and presses the button. A few minutes later, the toasted bread pops up, brown and crispy. What does this example show?

• kinetic energy

• energy transformation

• potential energy

• multiple transformation

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NGSS.MS-PS3-4

There are several forms of energy: electromagnetic, radiation, mechanical, electrical, thermal, chemical, and nuclear. Which forms of energy show both potential and kinetic energy?

• electromagnetic, mechanical, thermal

• nuclear, electrical, electromagnetic

• nuclear, thermal, electrical

• mechanical, thermal, electrical

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Blaine rides a ski lift to the top of a mountain slope and then skis to the bottom all day long. Which explains how his energy changes as he skis down the slope?

• He loses energy.

• He gains kinetic energy.

• He gains potential energy.

• He gains gravitational potential energy.

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NGSS.MS-PS3-2

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Gordon throws a baseball into the air. It rises, stops when it reaches its greatest height, and then falls back to the ground. At what point does kinetic energy convert to potential energy?

• when the baseball is rising

• when the baseball is falling

• while the baseball sits on the ground

• while the baseball is stopped in the air

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Which of the following has the most kinetic energy?

• a 25-kg fish tank sitting on a table

• a 50-g fish swimming in a fish tank

• a 7,500-kg car parked on a steep hill

• a 50-kg boulder suspended from a cliff

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Which of these is an example of the conversion of kinetic energy into gravitational potential energy?

• a bicyclist coasting down a long hill

• a car engine moving the car forward

• a roller coaster car moving toward the top of a rise in the tracks

• a thrown ball falling toward the ground after passing through the top part of its motion

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A mass hanging from a spring moves up and down. The mass stops moving temporarily each time the spring is extended to its fullest at Position 2 and each time it returns to its tight coil at Position 4.

Which answer choice best describes the type of energy the spring has at position 1?

• potential energy

• kinetic energy

• both potential energy and kinetic energy

• neither potential energy nor kinetic energy

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NGSS.MS-PS3-2