Mechanical Energy Quiz

What are the two types of mechanical energy?

• Kinetic and potential energy

• Kinetic and nuclear energy

• Potential and chemical energy

• Thermal and kinetic energy

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A skydiver jumps from a plane and is halfway through her descent. At this point in time, she has:

• Kinetic energy

• Gravitational potential energy

• Both kinetic and gravitational potential energy

• She has no energy

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Between a bowling ball and a soccer ball, which one has more kinetic energy and why?

• A bowling ball because it has more mass.

• A bowling ball because it is smaller.

• A soccer ball because it has more mass.

• A soccer ball because it is smaller.

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Which of the following has the GREATEST impact on the kinetic energy of an object and why?

• Mass because really small and really large objects cannot have the same kinetic energy.

• Velocity because it is squared in the formula for KE.

• Height because it can be a large amount.

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A pendulum bob swings back and forth (like on a grandfather clock). Its kinetic energy and its potential energy in relation to the bottom of its swing are the same at _______________.

• The bottom

• One-quarter of the vertical distance between the bottom and top of the swing

• One-half of the vertical distance between the bottom and the top of the swing

• At the top of the swing

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Which of the following objects has the most kinetic energy?

• A 20 kg toddler running at 5 m/s

• A 50 kg toddler running at 30 m/s

• A 90 kg toddler running at 30 m/s

• A 100 kg toddler running at 2 m/s

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Gravitational potential energy depends on the ____ and ____ of the object.

• Friction and movement

• Mass and movement

• Height and friction

• Height and mass

An Olympic high jumper, with a mass of 82 kg, has a maximum gravitational potential energy of 1970 J. How high was the jump?

• 24 m

• 161.540 m

• 2.5 m

• 201 m

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The world record for pole vaulting is 6.15 m. If the pole vaulter’s gravitational potential energy is 4942 J, what is his mass?

• A. 803.6 kg

• B. 504.3 kg

• C. 30,393.3 kg

• D. 82 kg

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An 8 kg dog chases a cat. If the dog has 400 J of kinetic energy, what is the speed of the dog?

• A. 10 m/s

• B. 5 m/s

• C. 1 m/s

• D. 100 m/s

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