Practice Work (2) - Work, Energy and Power

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9 questions

Flashcard drill
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 the formula for work?
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Remember it includes the force and angle.
Question 2.
What is the SI unit of work?
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Think of newton and meter.
3Question 3.
What is the formula for work?
- W = F × s × sin θ
- W = F × s × cos θ
- W = F + s
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Focus on the direction between force and displacement.
4Question 4.
Is work done when carrying an object at a constant speed horizontally?
- True
- False
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Consider the direction of the force.
Question 5.
A car engine exerts a force of 4000 N to position the car over a distance of 50 m. Calculate the work done. If the force is applied at an angle of 30 degrees to the direction of movement, how does that change your calculation?
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Don't forget to calculate cos(30°)!
Question 6.
If a person lifts a 10 kg box to a height of 2 meters, calculate the work done against gravity. If the same box is pushed along a surface with no friction for the same height, how does the work done compare?
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Remember to use mgh for lift work.

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