Energy Conservation

According to the Law of Conservation of energy, the amount of energy before and after a reaction must be the same. Which statement below is true?

• The total amount of energy is conserved
• The total amount of energy is less after a reaction
• The total amount of energy is more after a reaction

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Potential or kinetic?
Running?

• potential
• kinetic

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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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NGSS.MS-PS3-2

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

• A
• B
• C
• D

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NGSS.MS-PS3-1

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A bike rider approaches a hill at a speed of 5.5 m/s. The combined mass of the bike and rider is 87kg. Find the initial kinetic energy of the system. 
The rider coasts up the hill. Ignoring friction, at what height will the bike come to rest?

• 1316J, 1.5m
• 2316J, 2.5m
• 1457J, 3.5m
• none of the above

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NGSS.MS-PS3-1

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1. A ball has a 17 J of kinetic energy and its mechanical energy is 25 J. If the ball has a mass of 3.2 kg, what is its height above the ground?

• 0.26 m

• 0.52 m

• 5.2 m

• 25 m

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NGSS.MS-PS3-2

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If the Total Mechanical Energy is 50J, Potential Energy is 40 J, what is the Kinetic Energy?

• 1 J
• 10 J
• 90 J

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NGSS.MS-PS3-1

Which specific type of energy is at point A?

• Potential Energy
• Kinetic Energy
• Mechanical Energy
• None

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Which specific type of energy is at point B?

• Potential Energy
• Kinetic Energy
• Mechanical Energy
• None

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NGSS.MS-PS3-1

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What kind of energy is in a moving skateboard?

• Potential
• Kinetic
• Both potential and kinetic energy
• none of the above

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NGSS.MS-PS3-1

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