Explain why frictional force is said to be a contact force
Answers
=> Friction is caused due to contact of two or more than two object, so frictional force is often called contact force.
=> Frictional force comes into play only when two surfaces are in contact. The resistive force is observed in the surface of the book and the surface of the table that are in relative motion.
=> If you push a book on the table in the forward direction the frictional force will act in the backward direction.
Hope it helps !!!
Answer:
Explanation:
If life an object which is moving over a horizontal surface does not continue with constant velocity when the accelerating force is removed. Instead, the object slows down and eventually stops. The deceleration is caused by a frictional force between the object and the surface on which it travels. A frictional force always acts to oppose the motion of an object over a surface and is an example of a contact force. When we try to slide one object over another, we find that there is a force which opposes the motion. This force is called friction. Whenever there is relative motion of two surfaces in contact, there is frictional resistance. When a body moves over another, it has to overcome friction. This needs energy. Hence, some energy is always wasted in overcoming friction. When two parts of a machinery rub against each other heat are produced, and the efficiency of the machine decreases. There will be a greater wear and tear in the different parts of a machine due to friction.