If energy is zero then work done should be zero but If can object is moving with constant velocity the Kinetic energy is not Zero and work is zero. How?
Answers
Explanation:
Unless the constant velocity is 0ms, work is done when an object is moved a distance in the direction of the force.
A few scenarios to consider:
I am trying lifting a 20 N box that’s stationary on the ground with a 20 N force. Is work done? No, because the object is still on the ground with a constant velocity. The object will not move unless I apply a force that’s greater than the weight of the box.
I start dragging a 20 N cart with a force of 30 N, while the force of friction opposing my motion is 20 N. I reach constant velocity when I reduce my force applied to 20 N so that it’s equivalent to the 20 N force of friction. Since the forces are balanced, my cart now moves at a constant velocity. Am I doing work? Yes. Is the friction doing work? Yes. Is there any NET work being done on the cart? No, because the work done by friction cancels out the work done by you.
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