friction
Friction is a force that opposes the motion of two objects in contact. It arises due to microscopic irregularities on the surfaces of the objects. The amount of friction depends on the roughness of the surfaces and how hard they are pressed together. Friction can be helpful, like when it allows us to walk without slipping, or it can be a hindrance, like when it slows down moving parts in machines. Rougher surfaces create more friction than smoother ones. Friction acts in the direction opposite to the movement or attempted movement of the objects. It can be reduced by using lubricants such as oil or water. There are different types of friction, including static friction (which prevents motion) and kinetic friction (which opposes motion). The force of friction is nearly independent of the contact area but proportional to the force pressing the surfaces together. Friction is essential in many everyday activities, providing traction for walking, driving, and holding objects.
Friction is a force that opposes the motion of two surfaces in contact.
It arises from microscopic irregularities on the surfaces that interlock and resist movement.
Friction depends on the roughness or smoothness of the surfaces; rougher surfaces have more friction.
It also depends on the force pressing the surfaces together; more pressure increases friction.
There are different types of friction: static (prevents starting motion), sliding (when surfaces slide), and rolling friction (when objects roll).
Friction acts in the opposite direction to the movement or attempted movement.
It can be reduced by lubricants like oil, which fill irregularities between surfaces.
Friction is useful for everyday activities, such as walking without slipping or driving a car.
The amount of friction is nearly independent of the contact area but proportional to the normal force.
Friction converts some mechanical energy into heat, causing wear and energy loss in machines.