![]() If the force and the displacement are in the same direction, then positive work is done on the object. The work that is done can be positive work or negative work depending on whether the force doing the work is directed opposite the object’s motion or in the same direction as the object’s motion. ![]() In this case, work is negative as the force applied to the goalie net is in the opposite direction of the net’s movement. This is the opposite situation from the one above: the moving goalie net has kinetic energy, but loses kinetic energy as you slow it down. Your force is in the opposite direction as the movement. Net work is the total work that is done on an object. Negative work occurs when the force and the motion are in opposite directions. Positive work occurs when the force and the motion are in the same direction. The idea of zero work done might not be practicable and the system is not a reversible adiabatic. The net work done might not be zero because the energy supplied might not be equal to internal energy of the system. Net and total work refer to the same concept, the sum of all work done on an object. The force on an object can be a function of position or time, and could represent external forces placed on the system. “net” just means sum, so the net work is just the sum of the work done by all of the forces acting on the box. Net work done on an object equals the object’s change in kinetic energy. Both positive work and negative work have meaning: Positive work follows when the force has a component parallel to the displacement. ![]() Work is the energy transferred from an agent applying a force to an object or into heat, and the net work done on an object is the total change of kinetic energy. Whats the difference between work and net work? In equation form, this is Wnet=Fnetdcosθ W net = F net d cos θ where θ is the angle between the force vector and the displacement vector. Net work is defined to be the sum of work done by all external forces-that is, net work is the work done by the net external force Fnet. 24 What is no work in physics? What is the definition of net work in physics? ![]()
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