Question

Work is done on an object only if the object

Answer 1

Work changes the amount of mechanical and internal energy possessed by objects. When work is done on a system or object, energy is added to it. When work is done by a system or object, it gives some of its energy to something else. Throwing a ball means a hand applies a force as an arm swings forward.

Answer 2

Work is done on an object only if the object moves in the direction of the the applied force.

EXPLANATION:

• Work is fundamentally a type of energy, so as a rule, when the work is done on an object it should bring about a difference in its energy.  
• Work is characterized as the result of the force applied on an object and the distance through which the object moves under the use of the force.

• The work done by a force on an object can be positive, negative, or zero, contingent on the heading of relocation of the object with respect to the force.  
• If the force following up on an object is zero regardless of the condition of the object (dynamic or static) the work done by the force is zero.  
• If the subsequent relocation toward force, because of force following up on any object is zero, the net work done by that force on that object is zero.