Physics

Oil, Mobil or grease-like materials are called greasy materials or lubricants.

A non-contact force is a force that acts without any physical contact between two bodies.

Spring constant is of a spring is defined as the force required to produce unit extension or compression in the spring.

Contact force is the force in which an object comes in contact with another object.

A lubricant is a substance, usually organic, introduced to reduce friction between surfaces in mutual contact, which ultimately reduces the heat generated when the surfaces move.

The rate of change of momentum of a body is proportional to the applied force acting on it and the change of momentum also takes place in the direction in which the force acts. 

Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. 

The ability of a body to do work when normal position or configuration of an object is changed to some other position or configuration is called potential energy.