A force of 5 N causes the displacement of an object by 3 m in the direction in which the force acts. What work did the object do/has been done on the object?
My ans:
Work = F * Displacement
=+15 J
positive because it acts in the direction of the object?
yes. and Yes.
Your answer is correct. The work done on an object can be calculated by multiplying the force applied to the object by the displacement of the object in the direction of the force. In this case, the force applied is 5 N and the displacement is 3 m, both in the same direction.
So, the work done on the object is:
Work = Force * Displacement = 5 N * 3 m = 15 J.
The positive sign indicates that the work done is in the same direction as the force applied. If the force and displacement were in opposite directions, the work done would be negative. In this case, since both the force and displacement are in the same direction, the work done is positive.