Difference between revisions of "Work Done"

Revision as of 10:15, 9 October 2018

Work Done is the amount of energy transferred by the action of a force.

Work Done is measured in Joules.

Work Done can only be calculated for objects moving in the direction of the force.

\[ Work Done = Force \times Distance moved in the direction of the force\] \[ W = F \times d\] \[ W = Fd\]

Work done is written with a capital W. Force is written with a capital F. Distance is written with a lower case d.

1. A person lifts a 40N box by a height of 1.2m. Calculate the work done by the person against gravity.

\[Force = 40N\] \[Distance moved in the direction of the force = 1.2m\] \[ W = Fd\] \[ W = 40 \times 1.2\] \[ W = 48J\]

2. The brakes on a car apply a force of 10,000N. The car travels a distance of 15m braking. Calculate the work done by the brakes.

3. A person carries a 20N box along a horizontal path of 20m.

@@ Line 8: / Line 8: @@
 ===Equation===
-:<math> [[Work Done]] = Force \times Distance moved in the direction of the force</math>
+:<math> Work Done = Force \times Distance moved in the direction of the force</math>
 :<math> W = F \times d</math>
 :<math> W = Fd</math>
 : Work done is written with a capital W. Force is written with a capital F. Distance is written with a lower case d.
-===About Work Done===
+===Example Calculations===
+: 1. A person lifts a 40N box by a height of 1.2m. Calculate the work done by the person against gravity.
+:<math>Force = 40N</math>
+:<math>Distance moved in the direction of the force = 1.2m</math>
+:<math> W = Fd</math>
+:<math> W = 40 \times 1.2</math>
+:<math> W = 48J</math>
+: 2. The brakes on a car apply a force of 10,000N. The car travels a distance of 15m braking. Calculate the work done by the brakes.
+: 3. A person carries a 20N box along a horizontal path  of 20m.