Newton laws : Basics

Net force

Sum of all forces acting on an object

Newton's 1st law

A body will remain at rest unless acted upon by an external net force .

Newton's 2nd law

When an external net force acts on a object ,the object will accelerate in the direction of the force , acceleration is directly proportional to the force and indirectly proportional to the mass.

Newton's 3rd law

When object A exerts a force on object B , object B also exert a force on object B.

Friction

Force that opposes motion of an object.

Tension force

Force exerted in terms of using : ropes , strings

Static friction

A force that resists the tendency of movement of a stationary object

Kinetic friction

A force that resists a tendency of motion of a moving object.

Formula for Newton's 1st law

Fnet = 0

Formula for Newton's second law

Fnet = m.a

SI unit for mass

Kilogram (kg)

SI unit for force

Newton (N)

SI unit for acceleration

M.s^ -2

Net force is = 0, what happens to acceleration, motion ?

Acceleration = 0

No motion will occur.

Normal force

Force in which the surface is perpendicular to the object.

While drawing the free body diagram , what should be down ?

Fg (force of gravity)

While drawing the free body diagram , what should be up ?

Fn ( Normal Force)

While drawing the free body diagram , what should be on the left side ?

FK( kinetic force)

While drawing the free body diagram , what should be on the right side ?

Fa(force applied)