Practice Notions Of Work And Kinetic Energy: The Work-energy Theorem (5.2) - WORK, ENERGY AND POWER

Practice: NOTIONS OF WORK AND KINETIC ENERGY: THE WORK-ENERGY THEOREM

Lesson 5.2WORK, ENERGY AND POWER

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8 questions

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6 sample questions

Question 1.
What is the formula for calculating work?
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Remember the angle between force and displacement.
Question 2.
What does kinetic energy measure?
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Think about what happens when objects move.
3Question 3.
What is work defined as?
- The product of mass and velocity
- The product of force and displacement
- The energy of motion
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Consider the factors that contribute to work.
4Question 4.
True or False: Kinetic energy is always negative.
- True
- False
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Think about the properties of energy.
Question 5.
A truck of mass 2,000 kg is moving at a speed of 15 m/s. Calculate its kinetic energy. Then, if it encounters a frictional force of 500 N while moving 10 m, how much work is done against this force?
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Remember to break the problem into parts: calculating kinetic energy first, then work done.
Question 6.
A ball is lifted vertically 2 m with a constant force of 10 N. Calculate the work done. If the ball has a mass of 1 kg and is then dropped, what will its kinetic energy be just before hitting the ground?
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Think about how energy transforms from gravitational potential energy to kinetic energy.

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