Moment and levers

What is the moment of a force?

The turning effect of a force and it is the product of the force applied and the perpendicular distance of this force from the pivot

What is the formula for moment?

moment = force * perpendicular distance

What does the turning effect( moment) of a force depend on?

1. The size of the force applied

2. The distance from the pivot

What is the fulcrum/ pivot?

The point of rotation

What is the SI unit for moment

Newton metre (Nm)

What is a lever?

A simple machine which turns about a fulcrum when a force called the effort is applied to overcome another force known as the load

What is clockwise moment

When the turning effect of a force causes the object to turn clockwise about a fixed point

What does the principle of moment state?

When the total clockwise moments of an object are equal to the total anticlockwise moments, the objects will not turn

What happens when the total clockwise moments is more than the total anticlockwise moments?

The object will turn clockwise

What are the conditions for equilibrium?

1. The total forces of an object in one direction, is equal to the total forces in the opposite direction

2. The principles of moment

What is the effort?

The force applied

What is the load?

What u want to move

What is a first class lever?

fulcrum is between the effort and load

What is a second class lever?

load is between the pivot and the effort ( ELF)

What is a third class lever?

effort is between the fulcrum and the load ( FEL)

Give three examples of first class levers

1. see-saw

2. scissors

3. crowbar

Give three examples of second class levers

1. wheelbarrow

2. door

3. nutcracker

Give three examples of third class levers

1. broom

2. arm

3. ice tongs