4. Suppose that you push on the 30kg box as shown in figure with a constant force of 100N through a distance of 1.2m, and the average opposing force is SN. Find
a) the net work done of the box
To find the net work done on the box, we can use the formula:
Net work = work done by pushing force - work done by opposing force
First, let's calculate the work done by the pushing force:
Work done by pushing force = force x distance
Work done by pushing force = 100N x 1.2m
Work done by pushing force = 120 J
Next, let's calculate the work done by the opposing force. Since the opposing force is constant, we can use the formula:
Work done by opposing force = force x distance (since the force is acting in the opposite direction, the work done by the opposing force will be negative)
Work done by opposing force = -5N x 1.2m
Work done by opposing force = -6 J
Now, we can find the net work done on the box:
Net work = 120 J - 6 J
Net work = 114 J
Therefore, the net work done on the 30kg box is 114 Joules.