Practice Mechanical Energy (2.3) - Work, Energy and Power

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9 questions

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4 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
3 questions · about 2 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 what energy forms are included.
Question 2.
Write the formula for kinetic energy.
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What factors influence motion?
3Question 3.
What is the formula for mechanical energy?
- A) ME = KE - PE
- B) ME = KE + PE
- C) ME = KE x PE
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Recall our formula for mechanical energy.
4Question 4.
True or False: Mechanical energy can be created or destroyed.
- True
- False
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Think about the laws of energy conservation.
Question 5.
A pendulum has a mass of 3 kg and is raised to a height of 5 m. Calculate its potential energy at that height. As it swings down, what will be the speed at the lowest point?
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Use energy conservation and rearrange the KE formula.
Question 6.
A 2 kg ball is thrown upwards with a velocity of 15 m/s. Calculate its maximum height. Then, find the potential energy at that height and how it compares with the initial kinetic energy.
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Set KE equal to PE at maximum height to find height.

5 more questions in this section. Enroll free to practise them all.