Classify the following amongst contact and non-contact forces.
(a) Frictional force
(b) normal reaction force.
(c) force of tension in a string
(d) gravitation force
(e) electrostatic force
(f) magnetic force
The forces which act on bodies when they are in physical contact. are called contact forces. For e.g. frictional force and force exerted on two bodies during a collision.
The forces experienced by bodies even without being physically touched are called the non-contact forces. For e.g. Gravitational force and Electrostatic force.
Contact force: (a) frictional force (b) normal reaction force (c) force of tension in a string
Non-contact force: (d) gravitational force (e) electric force (f) magnetic force