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600N
3meters
500N 2 meters
Joule Watt Volt
Learning Objective: 1.5 Application of power
Learning Outcomes: State the meaning of power. State the unit of power. Calculate power on the work done.
1. State the meaning of power.
Power is the rate of doing ____________.
2. Underline the correct S.I unit of power.
3. A worker moves a load of 500N over a distance of 2meters in 2 second.
Using the formula above, the power is
= Force x Distance Time
= 500N x 2m 2s
= 1000Nm 2s
= 500W
Sani pushes a wheelbarrow with a force of 600N over a distance of 3 meters in 15 seconds. Calculate the power using the same example given above.
Power = Work doneTime
= Force x Distance Time
=
=
Power = Work doneTime
Joule Watt Volt
Power = Work doneTime
600N
3meters
500N 2 meters
Learning Objective: 1.5 Application of power
Answer Scheme
1. State the meaning of power.
Power is the rate of doing work.
2. Underline the correct S.I unit of power.
3. A worker moves a load of 500N over a distance of 2meters in 2 second.
Using the formula above, the power is
= Force x Distance Time= 500N x 2m 2s= 1000Nm 2s= 500W
Sani pushes a wheelbarrow with a force of 600N over a distance of 3 meters in 15 seconds. Calculate the power using the same example given above.
Power = Work doneTime
= Force x Distance Time
= 600N x 3m 15s
= 1800Nm15s
= 120W
