Newtons laws

Friction

A force that opposes the motion of an object

Static Friction

A force that must be overcome in order to move a stationary object

Kinetic friction

A force that resists the motion of a moving object

Gravitational force

Gravitational force the earth exerts on any object on or near its surface

Normal force

The perpendicular force exerted by a surface on an object in contact with it

Newton’s first law

An object contains in a state of motion or uniform velocity unless it is acted upon a net or resultant force

Inertia

A property of an object that causes it to resist a change in its state of rest or uniform motion

Newton’s second law

When a net force is applied to an object of mass M, it accelerate in the direction of the net force. The acceleration is directly proportional to the net force and inversely proportional to the mass

Newton’s third law

When object A exerts a force on object B, object B simultaneously exerts an oppositely directed force of equal magnitude on object A

Newton’s law of universal gravitation

Every particle with mass in the universe attracts every other particle with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres