Work Physics Example 3

Follow the full solution, then compare it with the other examples linked below.

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5 \text{ kg}

box is lifted

3 \text{ m}

vertically at constant speed. How much work is done by the lifting force? Use

g = 9.8 \text{ m/s}^2

1
At constant speed, the lifting force equals the weight: $F = mg = 5 \times 9.8 = 49 \text{ N}$ .
2
Work: $W = Fd = 49 \times 3 = 147 \text{ J}$

Answer

W = 147 \text{ J}

Lifting an object at constant speed requires a force equal to its weight. The work done equals the gain in gravitational potential energy.

About Work

The transfer of energy that occurs when a force causes an object to move through a distance in the direction of the force, calculated as.

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