When a body is moved with uniform velocity/speed, how the work is defined because here acceleration is 0 . It means force is 0.So, work done should also be 0 but actually its not ?
There is actually no work done if there is 'no force' acting on the body, or if the 'velocity' does not change. But in case of a non conservative force like friction, if you are keeping the velocity of body constant, then definitely you have to work against the dissipative forces of friction. You can see this by Work Energy theorem also. WE theorem tells, W(c)+W(nc)+W(ext)= change in Kinetic energy. since W done by conservative force zero and change in kinetic energy is also zero, hence W done by external agent = work done by non conservative forces with a -ve direction.
Thank you
work done = force x displacement
in case of constant velocity
1- work done will be zero, if constant velocity is maintained without any external force like any object is moving on smooth surface.
2 - work done will not be zero, if any external force is applied to maintain the constant velocity, like object on a rough surface. In this case work is done against friction forces.
Three identical balls are placed on a frictionless
horizontal surface touching each other. They stick to
each other because of adhesive. Another ball of same
radius and mass m is placed over the void created by
the three balls. Find the forces applied by the balls
kept on the floor to each other if the system remains
in equilibrium.
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A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.
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