Conservation of Mechanical Energy

You drop a 5 kg ball from a height of 2 m. Just before it reaches the ground, how much kinetic energy does it have?

• 10 J

• 100 J

• 7 J

• 20 J

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At which point(s) on the roller coaster is the kinetic energy at its maximum?

• A

• B

• C

• D

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At which point(s) on the roller coaster is the gravitational potential energy at its maximum?

• A

• B

• C

• D

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The Law of Conservation of Energy states:

• Energy can created or destroyed but not transformed 

• Energy cannot be created or destroyed, it can only transformed

• Energy can't be created, destroyed or transformed

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When external forces do positive work on an object, what happens to its mechanical energy?

• Gains mechanical energy

• Loses mechanical energy

• Stays the same

• Becomes zero

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In the example of the weightlifter lifting a barbell, what is the final energy of the barbell?

• 2000 J

• 250 J

• 1500 J

• 1750 J

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Which forces can change the total mechanical energy of an object?

• Both internal and external forces

• No forces can change the total mechanical energy

• External forces

• Internal forces

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What form of energy does the car have at the end of the skidding scenario?

• All kinetic energy

• All potential energy

• Both kinetic and potential energy

• No energy

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This drawing illustrates which of the following?

• Conservation of Mechanical Energy

• Conservation of Mass

• Conservation of Momentum

• Conservation of Matter

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At which point in the picture must the cart have the most MECHANICAL energy?

• Point 1

• Point 2

• Point 3

• They would all be the same

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