HARD
11th West Bengal Board
IMPORTANT
Earn 100

What are conservative and non-conservative forces? Give reasons why the force of gravity is a conservative force but frictional force is a non-conservative force.

Important Questions on Work, Energy and Power

MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 9 - Work, Energy and Power>EXERCISE>Q 12
Differentiate between gravitational potential energy and elastic potential energy. Obtain an expression for the strain energy of a stretched spring of unstretched length l0.
MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 9 - Work, Energy and Power>EXERCISE>Q 13
Prove that change in gravitational potential energy of a body on earth's field does not depend on the path in which the body has moved but it depends on the vertical displacement.
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 9 - Work, Energy and Power>EXERCISE>Q 14
Explain why the force of a spring is a conservative force.
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 9 - Work, Energy and Power>EXERCISE>Q 15
Calculate the potential energy stored in a spring when it is compressed.
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 9 - Work, Energy and Power>EXERCISE>Q 16
Prove that mechanical energy remains constant when a body moves up and down a smooth inclined plane.
MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 9 - Work, Energy and Power>EXERCISE>Q 17
Define elastic collision. Show that in an elastic collision, the relative velocity of approach before collision is equal to the relative velocity of separation after collision?
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 9 - Work, Energy and Power>EXERCISE>Q 18
Explain what happens when a body has a head-on elastic collision with another body of equal mass.
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 9 - Work, Energy and Power>EXERCISE>Q 18
Explain what happens when a very light has a head-on elastic collision with a very heavy body at rest.