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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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Concept of Work
Concept of Work
9 Mins
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NEXT VIDEOS
Numericals Based on Work
7 mins
Kinetic Energy
4 mins
Kinetic Energy
12 mins
Problems on Kinetic Energy
6 mins
Work done by a Variable Force
16 mins
REVISE WITH CONCEPTS
Work and Work Done by a Constant Force
Example
Definitions
Formulaes
Expression of Work
Example
Definitions
Formulaes
QUICK SUMMARY WITH STORIES
Work-II
3 mins read
Examples of Work Done by a Constant Force
2 mins read
Numericals on Work Done
2 mins read
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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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 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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>
When a body moves with a constant speed along a circle, then which of the following is correct :
Medium
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>
A body of mass
m
kg is lifted by a man to a height of one meter in
3
0
sec. Another man lifts the same mass to the same height in
6
0
sec, calculate the ratio of the work done by the two men.
Hard
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>
Convert 1 kWh into joules.
Medium
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>