(i) Explain by an example of what is meant by potential energy. Write down the expression for the gravitational potential energy of a body of mass 'm' placed at a height 'h' above the surface of the earth.
(ii) What is the difference between potential energy and kinetic energy?
​(iii) A ball of mass 0.5 kg slows down from a speed of 5 m/s to that of 3 m/s. Calculate the change in kinetic energy of the ball. State your answer giving proper units.
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- By the end of this section, you will be able to:
- By the end of this section, you will be able to:Explain gravitational potential energy in terms of work done against gravity.
- By the end of this section, you will be able to:Explain gravitational potential energy in terms of work done against gravity.Show that the gravitational potential energy of an object of mass m at height h on Earth is given by PEg = mgh.
- By the end of this section, you will be able to:Explain gravitational potential energy in terms of work done against gravity.Show that the gravitational potential energy of an object of mass m at height h on Earth is given by PEg = mgh.Show how knowledge of the potential energy as a function of position can be used to simplify calculations and explain physical phenomena.
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