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Laws Of Motion

Question

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Which one of the following statements is incorrect?

Rolling friction is smaller than sliding friction.

Limiting value of static friction is directly proportional to normal reaction.

Coefficient of sliding friction has dimensions of length.

Frictional force opposes the relative motion.

Solution

C.

Coefficient of sliding friction has dimensions of length.

Coefficient of friction or sliding friction has no dimension.

$f = μ_{s} N \Rightarrow μ_{s} = \frac{f}{N} = [M^{0} L^{0} T^{0}]$

Some More Questions From Laws of Motion Chapter

Is Aristotle’s law of motion now correct?

State Galileo’s law of motion.

Define inertia.

When the branches of an apple tree are shaken, the apples fall down. Why?

A person jumping out from a moving car or bus falls forward. Why?

Due to what type of inertia, the spark leaves the grind stone tangentially while sharpening the knife?

Which law of motion is also called law of inertia?

What is measure of inertia of body?

Which law of motion defines the force?

What happens to a stone tied to the end of string and whirled in a circle if the string suddenly breaks?

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