Question

 Explain the following: (a) An object increases its energy when raised through a height. (b) Energy is neither created nor destroyed then from where do we get energy. (c) When we push the wall, the wall does not move and no work is done.​

Answer 1

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1.) The energy of a body due to its position or change in shape is called potential energy. An object increases its energy when raised through a height. This is because work is done on it against gravity while is is being raised. The energy present in such an object is the Gravitational Potential energy.

2.) The first law of thermodynamics, also known as Law of Conservation of Energy, states that energy can neither be created nor destroyed; energy can only be transferred or changed from one form to another. In other words, energy cannot be created or destroyed.

3.) Even though the man exerts force on the wall , the wall does not move. Work done = force applied * displacement and since the displacement of the wall is zero. , work done is also zero. Answer: Even though the man exerts force on the wall , the wall does not move.

Hope it helps you..............

Answer 2

Answer:

1. The energy of a body due to its position or change in shape is called potential energy. An object increases its energy when raised through a height. This is because work is done on it against gravity while is is being raised.

2. Laws of conservation of mass states that mass can neither be created nor destroyed in a chemistry reaction

3. the man exerts force on the wall , the wall does not move. Work done = force applied * displacement and since the displacement of the wall is zero. , work done is also zero.