Question

Rohan is pulling a trolley with a force of $25N$. The maximum friction that can be applied by the floor on the trolley is $60N$. What should be the minimum force that Rahul should apply to move the trolley?

• A. $25N$
• B. $35N$
• C. $85N$
• D. $60N$

Answer 1

The correct option is B $35N$

Given:
Let’s assume that all the forces acting along the left hand side are negative and the forces along the right hand side are positive.

Force applied by Rohan along the left hand side = $+25N$

Friction force along the right hand side = $-60N$

Rahul to help out Rohan, he should apply force along the left hand side. Let his force = $+XN$

The net force of the complete system must be zero. Hence, the minimum force that Rohan should apply can be found out by equating the sum of all the forces in the system to zero.
+25 + (-60) + X = 0
X = 35 N