Conservation of Energy Mechanical Energy

A ball is projected into the air. Where is potential energy the greatest?

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As a roller coaster goes downhill

• kinetic energy is converted into potential energy.

• potential energy is converted into kinetic energy.

• electrical energy is converted into potential energy.

• potential energy is converted into electrical energy.

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A pole vaulter runs forward, plants his pole, rises in the air and lands. Which transfer of energy best represent this motion?

• gravitational potential --> elastic --> kinetic

• kinetic --> gravitational potential --> elastic

• kinetic --> elastic --> gravitational potential

• elastic --> gravitational potential --> kinetic

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Energy transformations occur when...

• energy is created through conduction

• energy changes from one form to another

• two forces slide together that are touching

• a chemical reaction takes place

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The picture shows a microwave oven. As a microwave oven is operated, electrical energy is transformed into all of the following types of energy EXCEPT —

• solar

• light

• thermal

• mechanical

The skater starts 8 meters above the ground. At which height on the ramp does the skater's total energy change ?

• 8 meters

• 4 meters

• 2 meters

• The skater's total energy doesn't change.

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Is energy always conserved?

• Always

• Often

• Never

• Sometimes

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Some students observing a classroom device being used, noticed the below energy transformations.

Electrical → Mechanical → Sound

Which device were the students most likely observing?

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As Elijah drops a ball from a height, its __________ energy decreases and its kinetic energy increases

• potential

• chemical

• thermal

• electric

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During a science class, Abigail and Samuel are discussing the law of conservation of energy. They wonder if the total amount of energy in the universe ____.

• remains constant

• changes constantly

• increases

• decreases