Work, Energy and Power Review

Energy is:

• A Charge

• Eating sugar and getting HYPE!

• The ability to do work

• mass

Which of the following is NOT work?

• A change in potential energy

• A change in kinetic energy

• A Force acting over a distance

• A change in mass

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NGSS.HS-PS3-1

NGSS.HS-PS3-2

Which of the following is required to have gravitational potential energy?

• Velocity

• Height

• Time

• Kinetic Energy

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NGSS.MS-PS3-2

Which of the following are required in order to have kinetic energy?

• Height

• Time

• Acceleration

• Speed or velocity

Which of the following would NOT result in work being done?

• A change in speed or velocity

• A change in mass

• A change in height

• A force acting over a distance

Which of the following are required in order to have power?

• Work

• A change in mass

• Constant speed or velocity

• Constant height

Saul and Martin both do 100,000 J of work when jogging. Saul does it in 80 seconds and Martin does it in 75 seconds. Who has more power and why?

• Saul, because he does it in less time

• Martin, because he does it in less time

• Saul, because he does it in more time

• Martin, because he does it in more time

Which sets of units represent legitimate units for the quantity work?

• newton x meter

• $kg\ \ x\ \frac{m^2}{s^2}$

• $kg\ x\ \frac{m}{s}$

• Joules

• $kg\ x\ \frac{m}{s^2}$

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Marisol and Tim both do 50,000 Joules of work while cutting their grass. Marisol completes the task in 1200 seconds and Tim completes the task in 1500 seconds. Who has LESS power and why?

• Tim, because it took him less time

• Tim, because it took him more time

• Marisol, because it took her more time

• Marisol, because it took her less time

Sebastian starts his car and drives down the road with a half a tank of gas. What is the energy conversion in this scenario?

• Kinetic Energy to Chemical Potential Energy

• Gravitational Potential Energy to Kinetic Energy

• Nuclear Potential Energy to Kinetic Energy

• Chemical Potential Energy to Kinetic Energy

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NGSS.HS-PS3-3