(a) Define potential energy. Write an expression for potential energy

1.	(a) Define potential energy. Write an expression for potential energy of an object of mass m raised through a height h. (b) Find the energy possessed by an object of mass 10 kg when it is raised to a height of six-metre above the ground. Given g- 9.8 m s-2
Answer» (a) An object increases its energy when raised through a height. This is because work is done on it against gravity while it is being raised. The energy present in such an object is the gravitational-potential energy. This gravitational-potential energy of an object at a point above the ground is defined as the work done in raising it from the ground to that point against gravity. An object of mass m, when raised through a height h from the ground, then work done by this object will be W = force x displacement = mg x h = mgh (b) Potential energy will be the work done by the object i.e., W = mgh = 10 x 9.8 x 6 = 588 J

(a) Define potential energy. Write an expression for potential energy of an object of mass m raised through a height h. (b) Find the energy possessed by an object of mass 10 kg when it is raised to a height of six-metre above the ground. Given g- 9.8 m s-2

Answer»

(a) An object increases its energy when raised through a height. This is because work is done on it against gravity while it is being raised. The energy present in such an object is the gravitational-potential energy. This gravitational-potential energy of an object at a point above the ground is defined as the work done in raising it from the ground to that point against gravity.
An object of mass m, when raised through a height h from the ground, then work done by this object will be
W = force x displacement = mg x h = mgh

(b) Potential energy will be the work done by the object i.e.,

W = mgh = 10 x 9.8 x 6 = 588 J

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