Question

Tan
a.
4. The work is said to be done when force is applied on the body and
the body moves in the direction opposite to the force
b. the body moves in the direction of the force
c. the body does not move from its initial position
d. none of the above​

Answer 1

Answer:

Work is a measurement of energy, so it may seem odd to think that a work can be negative — but it can!

Work is how much energy is done by a force over a distance. Suppose we needed to set up ice hockey goal nets. Initially the nets are standing still with zero velocity at the edge of the ice hockey rink. When you push a net, it will start moving at some speed; it has velocity. If there is a velocity then the net now has kinetic energy. Because the direction of the push and the movement of the net are in the same direction, there is now positive energy: the goalie net went from zero energy to some amount of positive kinetic energy. This is an example of positive work.