A block of mass 1 kg is placed at the point A of a rough track shown in figure (8-E6). If slightly pushed towards right, it stops at the point .8 of the track. Calculate the work done by the frictional force on the block during its transit from A to B.

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Solution

$G i v e n, m = 1 k g, H = 1 m, h = 0.8 m$

Here ,work done by friction

=change in P.E.

[as the body comes to rest]

$\Rightarrow W_{1} = m g h - m g H$

$1 \times 10 (0.8 - 1)$

$= - 1 \times 10 \times (0.2) = - 2 J$

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A block of mass 1 kg is placed at the point A of a rough track shown in figure (8-E6). If slightly pushed towards right, it stops at the point .8 of the track. Calculate the work done by the frictional force on the block during its transit from A to B.

Given,m=1kg,H=1m,h=0.8m Here ,work done by friction =change in P.E. [as the body comes to rest] ⇒W1=mgh−mgH 1×10(0.8−1) =−1×10×(0.2)=−2J

$G i v e n, m = 1 k g, H = 1 m, h = 0.8 m$

Here ,work done by friction

=change in P.E.

[as the body comes to rest]

$\Rightarrow W_{1} = m g h - m g H$

$1 \times 10 (0.8 - 1)$

$= - 1 \times 10 \times (0.2) = - 2 J$