Home PHYSICS TOPIC 8: WORK ENERGY AND POWER | PHYSICS FORM 1

# TOPIC 8: WORK ENERGY AND POWER | PHYSICS FORM 1

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## TOPIC 8: WORK ENERGY AND POWER | PHYSICS FORM 1

#### Work

The Concept of Work

If a person pushes a wall and the wall does not move, though the person may sweat and physically become tired, he would not have done any work. But if the person pushes a trolley and the trolley moves it is said work is done.

#### The S.I Unit of Work

Work is the product of force and distance moved in the direction of the force.

Thus,

Work = Force (f) * distance (d) moved in the direction of the force.

SI unit of work is Joules.

The Work Done by an Applied Force
Determine the work done by an applied force

#### Example 1

A sack of maize, which weighs 800N, is lifted to a height of 2m. What is work done against gravity?
Data given:
Force (f) = 800N
Height distance = 2m
Work done = ?
Solution:
Work done (w.d) = force (f) x distance (d)
w.d = 800N x 2m
= 1600 Joules
Work done (w.d) = 1600Joules

#### Energy

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