The work done BY PUSHING the block is the up-the-ramp component of the pushing force times the distance moved.
This Work is certainly not zero. The work done is coverted to both frictional heat and gravitational potential energy. In this case, none is converted to kinetic energy, however.
Ok work...
work = net force parallel to displacement
lets say something was pushed up a ramp at a constant velocity and you were asked how much work was done by pushing the block
well the forces parellel to the displacement is the x component of gravity friction opposing motion and a force pushing it up the ramp...
now if velocity is constant then acceleration is zero
and newtons second law
net force = mass time acceleration
so the net force would equal zero
w = F d
w = 0 d
w = 0
I don't see how any work could be done in this situation
Please Explain
THANK YOU!
1 answer
1 answer