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Question
A block is placed on a rough floor and a horizontal force F is applied on it. The force of friction f by the floor on the block is measured for different values of F and a graph is plotted between them. The correct statement is / are
A block is placed on a rough floor and a horizontal force F is applied on it. The force of friction f by the floor on the block is measured for different values of F and a graph is plotted between them. The correct statement is / are
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Solution
The correct options are
C The graph is a straight line of some slope for small F and a straight line parallel to the x axis for large F.
D There is a small kink on the graph.
When F<f that is F is small, slowly increasing and therefore f is also increasing. The body will not move and the graph will be straight line with some slope.
When F=f the body will just start to move which will result in kink in the graph.
When F>f the body will move but the frictional force becomes constant with the only kinetic coefficient of friction in picture.
C The graph is a straight line of some slope for small F and a straight line parallel to the x axis for large F.
D There is a small kink on the graph.
When F<f that is F is small, slowly increasing and therefore f is also increasing. The body will not move and the graph will be straight line with some slope.
When F=f the body will just start to move which will result in kink in the graph.
When F>f the body will move but the frictional force becomes constant with the only kinetic coefficient of friction in picture.
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