Welcome to the PF.V1NW3N said:
No. The force of 140 N is exerted over a distance of 18 m. (The box moves 6 m, but the force on the box equals its weight, not 140 N.)V1NW3N said:
When asking work, it should be specified "work of what force on what body".V1NW3N said:
V1NW3N said:
Well, the force on the box is equal its weight and the tension from the pulley system, in opposite direction. If it does not accelerate, the net force on the box is zero.Doc Al said:
I meant the force that the pulley system exerts on the box, not the net force on the box.ehild said:
That's the force doing the work against gravity on the box, which is what we care about here.In a pulley system, work is calculated by multiplying the force applied to the pulley by the distance the object moves. This is represented by the equation W = Fd, where W is work, F is force, and d is distance.
Multiple pulleys can affect the amount of work done in a few ways. First, it can decrease the amount of force needed to lift an object, as the weight of the object is distributed among the pulleys. However, this also means the distance the object moves will increase, resulting in the same amount of work being done overall.
Yes, work can be negative in a pulley system. This occurs when the force applied to the pulley is in the opposite direction of the object's movement. In this case, the work done on the object is considered to be negative.
The efficiency of a pulley system affects the work done by reducing the amount of work input needed. Efficiency is calculated by dividing the work output by the work input. The higher the efficiency, the less work input is needed to achieve the same work output.
The weight of the object affects the work done in a pulley system by determining the amount of force needed to lift the object. The heavier the object, the more force is needed, resulting in more work being done. However, the distance the object moves will also affect the work done, so a heavier object may not necessarily result in more work being done overall.