Answer : Force of friction is 2.04N
Given that:
Force = 4N
Mass = 0.200kg
Force of friction ?
[tex]\begin{gathered} F\text{ = ma} \\ \text{Make a the subject of the formula} \\ \frac{f}{m}\text{ = }\frac{ma}{m} \\ a\text{ = }\frac{f}{m} \\ a\text{ = }\frac{4}{0.200} \\ a=20m/s^2 \\ \text{Weight of the block} \\ W\text{ = mg} \\ W\text{ = 0.20 x 9.8 } \\ W\text{ = 1.96N} \\ \text{Force of friction = force applied - weight} \\ \text{Force of friction = }4\text{ - 1.96} \\ \text{Force of friction = 2.04N} \end{gathered}[/tex]