Question : Describe Friction in Brief..
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Answer:
Friction is the resistance to motion of one object moving relative to another. It is not a fundamental force, like gravity or electromagnetism. Instead, scientists believe it is the result of the electromagnetic attraction between charged particles in two touching surfaces.
✏ Friction = Whenever a body moves or tends to move over the surface of another body, a force comes into play which acts parallel to the surface of contact and opposes the relative motion. This opposing force us called Friction.
▶ Example - Consider a wooden block placed on a horizontal surface. Give it a gentle push. The block slides through a small distance and then comes to a rest. According to Newton's second law, a retarding force must be acting on the block.
This opposing force is Friction. The force of friction always acts tangential to the surfaces in contact and in a direction opposite to the direction of (relative) motion of the body.
★ More to Know :-
• Friction as the component of contact force : The two bodies placed in contact, attractive forces act between their particles at the surface of contact. As a result, each body exerts a contact force on the other. These mutual contact forces are equal and opposite, obeying Newton's Third Law.
The component of the contact force F normal to the contact surface is called normal force or normal reaction. The component parallel to the contact surface is called friction.
• Angle of Friction - The angle of friction may be defined as the angle which the resultant of the limiting friction and the normal reaction makes with the normal reaction.