Home
Class 11
PHYSICS
A stone is dropped from the top of a hig...

A stone is dropped from the top of a high tower. Will the mechanical energy of the stone be conserbed or not if the force of friction due to air is not neglected ?

Text Solution

Verified by Experts

Mechanical energy is conserved only when forces involved are conservative. As force of friction due to air is non-conservative, therefore, mechanical energy of the stone is not conserved.
Promotional Banner

Topper's Solved these Questions

  • WORK, ENERGY AND POWER

    PRADEEP|Exercise Long Answer Question|24 Videos

  • WORK, ENERGY AND POWER

    PRADEEP|Exercise Advanced Problems For Competitions|20 Videos

  • WORK, ENERGY AND POWER

    PRADEEP|Exercise Very Short Anwer Question.|54 Videos

  • THERMODYNAMICS

    PRADEEP|Exercise Assertion- Reason Type Questions|19 Videos

Similar Questions

Explore conceptually related problems

A stone dropped from the top of a tower reaches the ground in 3 s. The height of the tower is

A stone dropped from the top of the tower touches the ground in 4 sec. The height of the tower is about

A stone is dropped from the top of a tower. If it hits the ground after 10 seconds, what is the height of the tower?

A stone is dropped from the top of a tower and travels 24.5 m in the last second of its journey. The height of the tower is

A stone is released from the top of a tower of height 1960 m. calculate the time taken by the stone to hit the ground.

A stone is dropped from the top of a 400 m high tower. At the same time another stone is projected vertically upwards from the ground with a speed of 50 m//s . The two stones will cross each other after a time

A stone is dropped from the top of tower. When it has fallen by 5 m from the top, another stone is dropped from a point 25m below the top. If both stones reach the ground at the moment, then height of the tower from grounds is : (take g=10 m//s^(2) )

A stone is dropped from the top of a building in a high wind. The wind exerts a steady horizontal force on the stone as it falls. The path of the string is

PRADEEP-WORK, ENERGY AND POWER-Short Answer Question
  1. Can a body have momentum when its energy is negative?

    Text Solution

    |

  2. The potential energy function for a particle executing simple harmonic...

    Text Solution

    |

  3. A stone is dropped from the top of a high tower. Will the mechanical e...

    Text Solution

    |

  4. Figure shows two smooth inclined planes with different inclinations. T...

    Text Solution

    |

  5. A man can jump higher on moon than on earth. With same effort, can a r...

    Text Solution

    |

  6. A force F is related to the position of a particle by the relation F=(...

    Text Solution

    |

  7. A bullet of mass 0.01J kg and travelling at a speed of 500m//s strikes...

    Text Solution

    |

  8. In any perfectly inelastic collision, is whole of KE lost ?

    Text Solution

    |

  9. Throwinig mud on a wall is an example of perfectly inelastic collisio...

    Text Solution

    |

  10. What is meant by zero work ? State the conditions under which a force ...

    Text Solution

    |

  11. Two bodies of unequal masses have same linear momentum. Which one has ...

    Text Solution

    |

  12. Tow bodies of unequal masses have same K.E. Which one has greater line...

    Text Solution

    |

  13. How do potential energy and K.E. of a spring vary with displacement ?...

    Text Solution

    |

  14. What is meant by mass energy equivalence ? Discuss its significance in...

    Text Solution

    |

  15. Hydrogenic materials are used as moderators in nuclear reactors to slo...

    Text Solution

    |

  16. How do you justify energy conservation from the vibrations of a simple...

    Text Solution

    |

  17. A graph of potential energy V(x) verses x is shown in figure. A partic...

    Text Solution

    |

  18. A ball of mass mm, moving with a speed 2upsilon(0), collides inelastic...

    Text Solution

    |

  19. Consider a one-dimensional motion of a particle with total energy E. T...

    Text Solution

    |

  20. The bob A of a pendulum released from horizontal to the vertical hits ...

    Text Solution

    |