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Class 11
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Physics
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Work, Energy and Power
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Introduction to Work
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Nature of Work Done- II
Nature of Work Done- II
10 Mins
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REVISE WITH CONCEPTS
Nature of Work Done
Example
Definitions
Formulaes
>
QUICK SUMMARY WITH STORIES
Basics of Work Done
3 mins
Important Questions
Convert
1
joule to ergs.
Hard
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>
A force of 7 N acts on an object. The displacement is 8 m, in the direction of the force. Consider force acting on the object through the displacement. What is the work done in this case ?
Medium
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>
A rigid body moves a distance of 10m along a straight line under the action of a force of 5 N. lf the work done by this force on the body is 25 joules, the angle which the force makes with the direction of motion of the body is
Medium
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>
Explain Positive, Negative and Zero Work. Give one example of each.
Medium
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>
Give two examples of (i) positive work (ii) negative work (iii) zero work
Medium
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>
A cyclist comes to a skidding stop in
1
0
m
. During this process, the force on the cycle due to the road is
2
0
0
N
and is directly oppose to the motion.
(a) How much work does the road do on the cycle?
(b) How much work does the cycle do on the road?
Medium
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>
A man pushes a wall and fails to displace it. He does :
Medium
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>
A block of mass
m
=
2
.
5
0
k
g
is pushed a distance
d
=
2
.
2
0
m
along a frictionless, horizontal table by a constant applied force of magnitude
F
=
1
6
.
0
N
directed at an angle
θ
=
2
5
.
0
0
below the horizontal as shown in above figure. Determine the work done on the block by (a) the applied force, (b) the normal force exerted by the table, (c) the gravitational force, and (d) the net force on the block.
Medium
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>
A cyclist comes to skidding stop in 10m. During this process, the force on the cycle due to the road is 200 N and is directly opposed to the motion.(a) how much work does the road do on the cycle? (b) How much work does the cycle do on the road?
Medium
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>
A mass of
1
0
k
g
is at a point
A
on a table. It is moved to a point
B
. If the line joining
A
and
B
is horizontal what is the work done on the object by the gravitational force? Explain your answer.
Medium
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>