Explain why balancing the forces acting on a body is not enough to establish equalibrium. Give anexample to justify your answer.

Please find the answer in the explanation.

Explanation:

Balancing the forces acting on a body is not enough to establish equlibrium because of the principle of moment say that:

1.) For equilibrium to be attained, the sum of clockwise moment must be equal to the sum of anticlockwise moments.

2.) The sum of upward forces must be equal to the sum of the downward forces

According to the definition of moment, is the product of force and perpendicular distance.

Therefore, the perpendicular distance is needed to be considered.

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.