What is the difference between contact and noncontact forces

Two North poles show repulsion lines as do two South poles. While North and South poles attract. Note the difference in field lines between repulsion and attraction. Many forces can act on an object. The sum of all these forces is known as the net force. The two magnets experience a force of attraction. This is obviously an interaction between north and south poles an interaction between two north poles an interaction between two south poles. These magnets are obviously less powerful than the magnets shown above.

Explain why? One is a contact force and the other is a non-contact force. Is there a net force acting on the sky diver? Was this force a contact or non-contact force? Some forces merely attempt to do work. And there are other causes for work apart from force. Heat is also capable of doing work. Contact forces are forces that are exerted by contacting of two surfaces.

For an example, the forces acting on each other when one object is kept on top of another are contact forces. In this case, contact forces arise to balance out gravity, a non-contact force. Contact forces also occur when two objects collide. Under collisions, the contact forces create impulses. Friction and viscosity are two good examples for contact forces. For contact forces, the effect of the force takes place immediately after the force is applied. For example, a cable holding a ceiling lamp.

Two objects sliding past each other experience friction forces. For example, a box sliding down a slope. An object moving through the air experiences air resistance. For example, a skydiver falling through the air.