Question

Define work. How is work measured? When is work done by a force said to be negative?

Answer 1

Explanation:

The SI unit of work is joules (J). ... Work done is said to be negative, if the displacement of the given object occurs in the opposite direction (180°) of the applied force. Examples: 1) When we throw a stone upwards, the gravity acting on the stone is downwards.

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Answer 2

The SI unit of work is joules (J). ... Work done is said to be negative, if the displacement of the given object occurs in the opposite direction (180°) of the applied force. Examples: 1) When we throw a stone upwards, the gravity acting on the stone is downwards.