A block is sliding on a horizontal surface at a speed of 1ms−1. The friction offered by the surface on the block is 1 N. A horizontal force is applied to the block to increase its speed to 2ms−1. Now, the friction offered by the table will be:
A
2 N
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B
1 N
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C
3 N
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D
4 N
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Solution
The correct option is B 1 N As the block is sliding on the horizontal surface, kinetic or sliding friction will be acting on it. On applying a horizontal force, the sliding friction or kinetic friction remains unchanged. Hence, kinetic friction will also remain unchanged, i.e., equal to 1 N.