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Chapters
▶ 2: Work, Power and Energy
Chapter 3: Machines
Chapter 4: Refraction of Light at Plane Surfaces
Chapter 5: Refraction of Light through Lenses
Chapter 6: Spectrum
Chapter 7: Sound
Chapter 8: Current Electricity
Chapter 9: Household Circuits
Chapter 10: Electromagnetism
Chapter 11: Heat
Chapter 12: Modern Physics
![Lakhmir Singh solutions for फिज़िक्स [इंग्रजी] इयत्ता १० आईसीएसई chapter 2 - Work, Power and Energy - Shaalaa.com](/images/physics-english-class-10-icse_6:bfbcc704031b4fd398b72f80ee978e3f.jpg "Lakhmir Singh solutions for फिज़िक्स [इंग्रजी] इयत्ता १० आईसीएसई chapter 2 - Work, Power and Energy")
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Solutions for Chapter 2: Work, Power and Energy
Below listed, you can find solutions for Chapter 2 of CISCE Lakhmir Singh for फिज़िक्स [इंग्रजी] इयत्ता १० आईसीएसई.
Lakhmir Singh solutions for फिज़िक्स [इंग्रजी] इयत्ता १० आईसीएसई 2 Work, Power and Energy Intex Question [Pages 24 - 28]
THINK AND ANSWER
A max X goes to the top of a building by a vertical spiral staircase. Another man Y of the same mass goes to the top of the same building by a slanting ladder. Which of the two does more work against gravity and why?
THINK AND ANSWER
Has work been done in the following example?
A pen falls off a table, straight to the floor.
Has work been done in the following example?
A boy pushing against a locked door.
Has work been done in the following example?
A rocket accelerating through space.
Has work been done in the following example?
A cricket player hitting a ball during match.
Has work been done in the following example?
An athlete running in a circular track at the same speed.
TEST YOUR UNDERSTANDING - 1
Define work.
State the SI unit of work.
Write the formula for the work done on a body when a force acts on the body in the direction of its displacement. Give the meaning of each symbol which occurs in the formula.
Define 1 joule of work.
What are the S.I. and C.G.S units of work? How are they related? Establish the relationship.
Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.
Give one example in which a force does positive work.
Give one example in which a force does negative work.
Give one example in which a force does zero work.
What will be the work done when a man stands with a 5-kg load on his head for 20 min? Explain.
What are the quantities on which the amount of work done depends? How are they related to work?
Define power.
Mention the relationship between horsepower and the SI unit of power.
What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.
Solutions for 2: Work, Power and Energy
Lakhmir Singh solutions for फिज़िक्स [इंग्रजी] इयत्ता १० आईसीएसई chapter 2 - Work, Power and Energy
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