Forces

Newton’s first law (unofficial)

An object will remain at rest or continue to move with constant velocity unless acted on by an unbalanced force.

Newton’s second law (unofficial)

When an object is acted on by unbalanced forces, the magnitude of acceleration is directly proportional to the size of unbalanced force.

Newton’s third law (unofficial)

Every action has its equal and opposite reaction.

Definition of friction

Friction is a force that opposes the motion of an object. It always acts in the opposite direction to motion.

Definition of tension

Tension is the pulling force transmitted through a rope, string, wire etc. when it is pulled tight.

Definition of momentum

Measure of the motion of a physical object in terms of its mass and velocity

Principle of conservation of momentum

Total momentum before=total momentum

Definition of impulse

Change in momentum

Tension, (sometimes) friction and F_un formula

F_un=T-friction

Horizontal force formula

F_H=Fcos(angle)

Vertical force formula

F_v=Fsin(angle)

Formula for weight down a slope

W_parallel=mgSin(angle)

Formula for weight into a slope

W_{perpendicular}=mgCos(angle