Thread: physics help...

i don't know how to solve this problem..

a box (m=30kg) is sliding along a path with initial speed of 5m/s. using the definition of energy and work determine how far the box will go before stopping. (uk=0.04)

Originally Posted by maeca

i don't know how to solve this problem..

a box (m=30kg) is sliding along a path with initial speed of 5m/s. using the definition of energy and work determine how far the box will go before stopping. (uk=0.04)

Lets also assume that gravitational acceleration is g = 10 m/s/s.

So the initial kinetic energy of the box is

Nm

The frictional force opposing motion is

N

So the work done by friction to overcome the initial kinetic energy is



where d is the distance oevr which the force has acted. To stop the box the W = E, therefore

m

Hope this helps.

thanks..that a great help