Forces

Newtons first law

An object at rest stays at rest and object in motion stays in motion unless acted upon by an unbalanced net force

Newtons second law

The acceleration of an object is directly proportional to the net force action on it & inversely proportional to its mass.

Newtons third law

when two bodies interact, the forces they exert on each other are equal in magnitude and opposite in direction.

Inertial 

A tendency of an object to resist chyange in its roginal state. Bigger mass= bigger inertia 

Kepleir’s law 1

The path of each planet about the sun is ellipse with the sun at one foci

Kepleir’s law 2

Each planet moves so that an imghinary line from the planet to the sun will seep out equal areas in equal time periods

Kepleirs third law

The ratio of the swaure of the period for any two planers will equal the ratio of cubes of their mean distances from the sun

Archinemides principle

When an object is partially/ wholly in a flud, it experiences a buoyancy force equal to the weight of the displaced fluid.

Air resistance 

Force that oppsoes motion 

Non-inertial fram of reference

• Under acceleration

• Newtons laws don’t apply

Fields

A collection of vector one for each point in space that give the magnitude & direction of the force vector when on an appropriate object is placed in the field.