Physics 1 - Mechanics

metres (m)

S.I Unit for distance

seconds (s)

S.I Unit for time

kilograms (kg)

S.I Unit for mass

Newtons (N)

S.I Unit for force

Joules (J)

S.I Unit for Work done and Energy

ms^-1

S.I Unit for velocity

ms^-2

S.I Unit for acceleration

Speed

Distance travelled per unit time

Acceleration

Change in speed per unit time

Force

a push or pull on an object

Newton’s 1st Law (Law of inertia)

An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line, unless acted on by an unbalanced force

Newton’s 2nd Law (F=ma)

The acceleration of an object is directly proportional to the net force acting on it, in the direction of the net force, and inversely proportional to the mass of the object.

Kinetic Energy formula

1/2mv²

Gravitational Potential Energy Formula

mgh

Work

The energy transformed

Formula for Work

W=Fd

Mass

the amount of matter in an object

Weight

The force of gravity acting on an object, always acts downwards towards the centre of the Earth

Support

the elastic response from a supporting surface. Always acts perpendicular to the supporting surface

Friction

the force that opposes relative motion of two surfaces. Always in the opposite direction of where the object tends to slide

Tension

elastic response from a rope/string/spring when being stretched. Direction is always along the string

Thrust

driving force possessed by objects with their own source of power. Always acts in the driving direction