Force of Friction
If a wooden block is placed on the table and a spring balance is attached to it. If we apply a very small force of magnitude F by pulling the spring gradually and increase it, we observe that the block does not move until the applied force has reached a critical value ( Maximum Value). If F is less than this critical value, the block will not move. According to Newton's First Law of Motion, no unbalanced force acts on it. It means there is some other force acting on the block in a direction opposite to applied force. This opposing force acting between surfaces in contact is known as Force of Friction.
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