Which situation involves an increase in potential energy?
Lifting a book to a higher shelf
Gravitational potential energy is given by PE = mgh, where m is mass, g is acceleration due to gravity and h is height above a reference level. So potential energy increases when an object is raised to a greater height.
Lifting a book to a higher shelf raises its height h, and the work done against gravity is stored in the book as an increase in potential energy.
Dropping a book to the floor reduces its height, so its potential energy decreases (converted into kinetic energy). Sliding a book across a table keeps its height constant, and placing it in water does not raise it, so neither increases its potential energy.
Hence, Lifting a book to a higher shelf.
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Important Questions from Work Power Energy
Which of the following is NOT correct regarding friction?
If a pump can raise 200 liters of water through a height of 300 meters in one minute, how much work can it do in one hour?
Which of the following is an example of kinetic energy?
How much kinetic energy does a 160 g cricket ball have when it is thrown at a speed of 22 m/s?
The movement of birds is an example of _______.
