You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard XII

Physics

Relation between Work Done and PE

A block of ma...

Question

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.

Open in App

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]

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

$1 \times 10 (0.8 - 1)$

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

Suggest Corrections

Similar questions

Q. A block of mass m is placed at point A on a rough track as shown in the figure. If slightly pushed towards right, it stops at point B of the track. Calculate the work done by the frictional force on the block during its transit from A to B.

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

Q. A particle is placed at the point A of a frictionless track ABC as shown in figure. It is pushed slightly towards right. Its speed when it reaches the point B is (

g = 10 m s^{- 2}

)

Q. The block of mass

1 k g

slides down a curved track which forms one quadrant of a circle of radius

1 m

as shown in the figure. The speed of block at the bottom os the track is

v = 2

m s^{- 1}

. The work done by the force of friction is:

Q. A block

‘ A^{'}

of mass

45 kg

is placed on a block

‘ B^{'}

of mass

123 kg

. Now block

‘ B^{'}

is displaced by external agent by

50 cm

horizontally towards right. During the same time block

‘ A^{'}

just reaches to the left end of block

B

. Initial position is shown in figure. Refer to the figure and find the work done (in

Nm

) by frictional force on block

A

in ground frame during above time. (take

g = 10 m s^{- 2}

)

Join BYJU'S Learning Program

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]

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

$1 \times 10 (0.8 - 1)$

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