Practice Mechanical Energy (4.3.3) - Work, Energy and Power

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10 questions

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Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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4 questions · about 3 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is mechanical energy?
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Think about energy in moving objects and heights.
Question 2.
Write the formula for kinetic energy.
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It involves mass and velocity!
3Question 3.
What is the formula for mechanical energy?
- ME = KE + PE
- ME = KE - PE
- ME = KE × PE
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Consider the definitions of kinetic and potential energy.
4Question 4.
True or False: Mechanical energy can be created and destroyed.
- True
- False
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Think about conservation of energy.
Question 5.
A 10 kg rock is dropped from a height of 40 m. Calculate its velocity just before it hits the ground.
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Use energy conservation principles.
Question 6.
During the operation of a car engine, some mechanical energy is lost due to friction and heat. If the car has 2000 J of useful mechanical energy and loses 500 J, calculate its efficiency.
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Remember the efficiency formula.

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