Question

The force required to move a mass of $1kg$ at rest on a horizontal rough plane ($\mu =0.1$and$g=9.8m{s}^{-2}$) is

• A. $0.98N$
• B. $0.49N$
• C. $9.8N$
• D. $4.9N$

Answer 1

The correct option is A

$0.98N$

Step 1 : Given data

Mass $=1kg$

Coefficient of friction

$\mu =0.1$

Acceleration due to gravity

$g=9.8m{s}^{-2}$

$N=$Normal force

Step 2 : To find the force

Force ,

$$\begin{gathered} F=f_r \\ =\mu N \\ =\mu mg \\ F=0.1\times 1\times 9.8 \\ =0.98N \end{gathered}$$

Hence the force is $0.98N$

Therefore the correct answer is Option A.