300 J of work is done in sliding a 2 kg block up an inclined plane of he...
Aipmt /Neet 2006 | WPE Q 3 |Here a word is missing in the qus “Slowly “as we
move the block up the incline the internal forces( Gravity & Friction ) of
block-incline plane system will come in play but there will be no change in
kinetic energy of block . Only then we can apply Work-Energy Theorem
Change in an object’s kinetic energy is
equal to the net work done on the object. This is called Work Energy Theorem
where we will take work done by all forces
equal to zero. Since work done by gravity is independent of path we will write
it down –mgh. So now only work done by Friction needs to be calculated. Before
filling your choice keep in mind . Qus asked about , How much work has to be
done against Friction not the work done by Friction.
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