The positive terms are those which add to the KE of the block. Will coasting uphill increase it or reduce it?Dylan R said:
Reduceharuspex said:
So what sign should it have?Dylan R said:
-haruspex said:
Treating what as a closed system? The block is certainly not a closed system by itself. It is acted on by external forces and these change its KE. But we know it starts and ends at rest, so the net work done on it is zero. Going down the slope, gravity does positive work on it, but going up the slope gravity does negative work on it.Dylan R said:
Net work done is the total amount of energy transferred or converted by a force on an object. It takes into account both the magnitude and direction of the force, as well as the displacement of the object.
Net work done is calculated by multiplying the magnitude of the force applied to an object by the distance the object is displaced in the direction of the force. This can be represented by the equation W = F x d.
The units for net work done are joules (J), which is the standard unit of energy in the International System of Units (SI).
Yes, net work done can be negative. This occurs when the force applied to an object is in the opposite direction of the displacement of the object, resulting in the transfer of energy away from the object.
Net work done is directly related to the change in kinetic energy of an object. This is known as the work-energy theorem, which states that the net work done on an object is equal to the change in kinetic energy of the object.
