What is the work done by friction in a sliding mass on a 30 degree incline?

[striving]

Starting from rest and a height of 10m, a 2 kg mass slides down a 30 degree incline, reaching the bottom with a speed of 10 m/s. What is the approximate work done by friction? I don't know how to calculate the work done by friction , can someone help me please

 

[rock.freak667]

Starting from rest and a height of 10m, a 2 kg mass slides down a 30 degree incline, reaching the bottom with a speed of 10 m/s. What is the approximate work done by friction? I don't know how to calculate the work done by friction , can someone help me please

What concept would you utilize here? You know the initial conditions and the final conditions.

 

[gneill]

Think in terms of energy conservation. At the top of the incline the mass had a certain potential energy due to gravity and its height. At the bottom of the incline it had a kinetic energy as dictated by its velocity.

 

[striving]

so the work done by friction will be the energy difference between initial potential energy and final kinetic energy?

 

[gneill]

Where else would it go?

 

[striving]

i hate to say that, but be honest i don't know

 

[rock.freak667]

so the work done by friction will be the energy difference between initial potential energy and final kinetic energy?

Yes, will give you the work done by friction.

i hate to say that, but be honest i don't know