CALCULATION INVOLVING WORK DONE

Basic Science JSS2 Second Term

WEEK THREE

CALCULATION INVOLVING WORK DONE

Content

REFERENCE
Precious seed BASIC SCIENCE FOR JUNIOR SECONDARY SCHOOLS BOOK 2

TOPIC: CALCULATION INVOLVING WORK DONE

Worked Example 1

How much work is done when a force of 5 kN moves its point of application 600mm in the direction of the force.

Solution

W.D = (5×10³)×(600 × 10^-3)

        = 3000J

        = 3KJ

Worked Example 2

Find the work done in raising 100 kg of water through a vertical distance of 3m.

Solution

The force is the weight of the water, so

W.D = (100 × 9.81) × 3

         =294J

Work done by a variable force

Worked example 3

What is the…