LEVER, THE MOMENT OF FORCE, PRICIPLE OF MOMENTS OF LEVER

LEVER

1.A lever is a bar that rotates on a fixed point.
2.A lever is a simple machine.
3.A lever allows us to use minimal force to do work.

Purpose of a lever:

1. A lever allows us to do work easily.
2. A lever allows us to use minimal force to do work.

Classes of lever

First Class Lever

• In a first class lever , the Fulcrum is between
the effort and the load.

Second class lever

• In a and the effort. second lever , the Load is between the fulcrum

Third Class Lever

• In a third class lever , the Effort is between the fulcrum and the load.

Moment of force

1. The moment of force is the turning effect of force on an object.
2. Formula:

Moment of force = Force (N) x perpendicular distance to the force (m).

3. The moment of force increase if:
a) Magnitude of force increases.
b) perpendicular distance from pivot (fulcrum) to effort increases.

Unit = Newton meter (Nm).



The Principle Of Levers

Load(N) x The distance of load = Force or x The distance of effort
from the fulcrum (m)
from the fulcrum (m) Effort(N)