Force is an influence that changes the motion of a body. It is like a push or pull.
It makes a body with mass to alter its state of rest (inertia) or of uniform motion in a direction. A force acts on a body through a contact or through a field in space.
Forces are of two types:
1. Contact forces
Friction, normal force, Tension in a string or rod, spring (restoration) force, applied force (push or pull), air resistance of drag, buoyancy force in a fluid
2. Distant forces or non-contact forces
Electric force of attraction, nuclear forces, magnetic force of attraction or repulsion, gravitational force of attraction