friction
The force between two objects that produces heat.
Friction is the force that opposes the motion of two surfaces that are in contact with each other. It is caused by the irregularities in the surfaces of the objects that are touching each other. Friction can either be static friction or kinetic friction.
Static friction is the force that keeps an object at rest when a force is applied to it. It is the friction that must be overcome before an object can start to move. The amount of static friction depends on the types of surfaces in contact and the force applied to the object.
Kinetic friction is the force that opposes the motion of an object that is already in motion. It is usually less than the force of static friction and depends on the speed of the object, the types of surfaces in contact, and the force applied to the object.
Friction is important in our daily lives as it helps us to walk, drive, and move objects. However, friction is also a force that can cause wear and tear on objects and machines. To reduce friction, we use lubricants such as oil or grease on surfaces to help them slide more easily.
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