22 terms

Torque

Torque = force x perpendicular distance between forces

Couple

Two parallel forces of equal magnitude acting in opposite directions

Moment =

Force x Perpendicular Distance from fulcrum

Newtons law of gravitation

Force of attraction of 2 bodies is proportional to product of masses and inversely proportional to the distance squared between the centre of the bodies

Boyle's Law

For a fixed mass of gas at constant temperature the pressure of the gas is inversely proportional to the volume of the gas

Law of Floatation

The weight of a floating body is equal to the weight of fluid it displaced

Archimedes Principle

When a body is partially or wholly immersed in a liquid the upthrust is equal to weight of fluid it displaces

Pressure =

Force / Area

Pressure in a liquid =

(Density)x(gravity)x(depth)

Newton's First Law

A body will move at constant velocity unless a force acts on it

Newton's Second Law

The rate of change of momentum of an object is proportional to the force creating the change and takes place in the same direction as the force

Newton's Third Law

If A exerts a force on B then B exerts an equal but opposite force on A

Acceleration

Rate of change of velocity with respect to time

Velocity

Rate of change of displacement with respect to time

Displacement

Distance in a given direction

Work =

Force x Displacement

Energy

The ability to do work

Principal of conservation of energy

Energy cannot be created or destroyed. It can only be changed from one form to another

Power =

Work / time

Percentage Efficiency =

(Energy out / Energy In) x 100

Kinetic Energy =

1/2 (mass)x(velocity squared)

Potential Energy

Mass x gravity x height