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Definition of Friction

Definition of friction Friction is a force that opposes relative motion between 2 bodies in contact. So what is relative motion? Now, look at this example. Cars are moving on the road. The car and the road are in contact. The car is moving. The road is not moving. But, the car is moving relative to the road. Again, the car is moving in this direction. The road is not moving. But, the car is moving relative to the road. So, this is called relative motion. Now, friction is a force that opposes such relative motion. Second, friction acts in the opposite direction to the force applied and parallel to the surface. Now, let's look at a similar example. Cars are moving on the road. The cars and the road are in contact and are in relative motion. The car is moving in this direction with a certain force. Friction will act in the opposite direction. Friction acts parallel to the surface and never perpendicularly. Third, The frictional force depends on the type of siding materials. The higher the roughness of the surfaces, the higher will be the friction. This simulation shows the interlocking of rough surfaces at a microscopic scale. Now, let's sum it up with an example. Friction enables us to walk. How? When we walk we apply a muscular force in the backward direction. This is a relative motion between the person and the ground. This causes a reaction force and a frictional force in the forward direction. This force propels us forward. Let us also discuss the formula for friction. the frictional force is equal to mu into m into g. where m into g is the normal force. where mu is the coefficient of friction at the point of contact between the shoe and the ground. where m is the mass of the object. And g is the acceleration due to gravity. If you like this video, then please don't forget to subscribe like, and share this video. For more information please visit www.dewwool.com/friction #friction #grade8 #physics #animation #video #definition