work done, moment of a force,levers

What is work done?

The product of the force and the distance travelled in the directionof the force.

Work done si unit

Joules (J) or nm

What is the moment at a force

The product of the force and the perpendicular distance of the line of action of the force to the pivot

What is the principle at moments?

For a system in equilibrium, the sum of clockwise moments about a point is equal the sum of anticlockwise moments taken about that same point.

What is a lever?

Simple machines which turn about a fulcrum when an effort is applied to overcome a load

Ist class

EFL

2nd class

FLE

3rd class

F el

Levers help to do work more easily by…

Transferring force applied at one part to overcome a load of another part.

Providing a trade-off between the effort and the distance over which the effort moves.