Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Laws of Motion

Question:

A block of certain mass is placed on a flat surface. A force is applied to move it parallel to the surface. The frictional force fr developed is directly proportional to the :

Options:

mass2

mass

$\frac{1}{mass}$

$\frac{1}{mass^2}$

Correct Answer:

mass

Explanation:

Frictional force : $f_r = \mu N$

As N = mg

Thus, $f_r = \mu m g$

$\Rightarrow f_r \propto m$