Calculate the moment of force that the boy is exerting about the pivot.

To calculate the moment of force that the boy is exerting about the pivot, we need to know the distance between the point where the force is being applied and the pivot. Let's assume this distance is 1 meter.

The formula to calculate the moment of force is:

Moment of force = Force x Distance

Let's assume the boy is exerting a force of 50 Newtons. Therefore, the moment of force would be:

Moment of force = 50 N x 1 m
Moment of force = 50 Nm

So, the moment of force that the boy is exerting about the pivot is 50 Newton-meters.

Given:

- Distance from pivot to force (d) = 1.2 m
- Force applied (F) = 40 N

Formula:

Moment of force (M) = Force (F) × Distance from pivot (d)

Calculation:

M = F × d
M = 40 N × 1.2 m
M = 48 Nm

Therefore, the moment of force that the boy is exerting about the pivot is 48 Nm.