Physics - Forces in Action

What is the unit of Force

Newtons (N)

What is the centre of gravity of an object?

An imaginary point where all of an objects mass appears to act.

If we freely suspend an object where is the centre of gravity?

Vertically below the point of suspension

Objects can balance when they are placed with centre of gravity where?

Above or below the point being held

What are the three main characteristics that make an object stable?

The Centre of Gravity is inside of the “base”, the Centre of Gravity is low, the “base” is wide

What is the law of the lever?

When the distance from the pivot to the effort is greater than the distance from the pivot to the load THE FORCE IS AMPLIFIED.

What is the unit of moments?

Newton metres (Nm)

What is the equation for moments?

Moments = F x d

What does an object have to be to be in equilibrium?

sum of anticlockwise moments = sum of clockwise moments

What does pressure depend on?

Force and area