Question

In tug of war, the team that exerts a larger tangential force on the ground wins. Consider the period in which a team is dragging the opposite team by applying a larger tangential force on the ground. List which of the following works are negative?

i.Work by the winning team on the losing team

ii.Work by the losing team on the winning team

iii.Work by the ground on the winning team

iv.Work by the ground on the losing team

• A. None of these
• B. ii, iii, iv
• C. I, ii, iii, iv
• D. ii, iv

Answer 1

The correct option is D

ii, iv

(i) Work done by the winning team on the losing team is the work done by the force applied on the losing team by the winning team, which is the tension in the rope. This will be positive as the displacement of the losing team will in the direction of tension.

(ii) The work done by the losing team on the winning team will be negative as the winning team will move in the opposite direction.

(iii) The force on the winning team by the ground will be in the direction of motion, so work will be positive.

(iv) The losing team will move in a direction opposite to the friction on it. Work done by friction will be negative.