Question
Download Solution PDFWhich one of the following statements is incorrect?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCONCEPT:
- The property of a surface that opposes the relative motion between two surfaces is called friction.
Friction (f) = μ N
Where μ is the coefficient of friction and N is the normal force
There are three types of friction:
1. Static friction:
- The friction that exist between object at rest and a rough surface on which it is placed, such friction is termed as static friction.
- The coefficient of friction due to this friction is called a static friction coefficient.
2. Kinetic friction:
- The friction between the two surfaces when there is a relative motion between the surfaces then it is called kinetic friction.
3. Rolling friction:
- When a block is rolling on a surface then the friction acting is called rolling friction.
EXPLANATION:
- When a block is rolling on a surface then the friction should be enough so that the block can roll on the surface. That’s why the rolling friction is less than the static friction. So statement 1 is correct.
Friction (f) = μ N
- According to the given above formula, the limiting friction is directly proportional to the normal force on the block. So statement 2 is correct.
- According to the definition of friction, it opposes the relative motion between two surfaces. So statement 3 is correct.
- As the coefficient of friction is a constant term which only depend on the surface. It is a dimensionless quantity. So statement 4 is wrong. Hence option 4 is correct.
Last updated on Jun 20, 2025
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