Home
Class 11
PHYSICS
In which case does the potential energy ...

In which case does the potential energy decrease ?

A

On compressing a spring

B

On stretching a spring

C

On moving a body against gravitational force

D

On the rising of an air bubble in water

Text Solution

Verified by Experts

The correct Answer is:
D
In compression or extension of a spring work is done against restoring force. In moving a body against gravity work is done against gravitational force of attraction. It means in all three cases potential energy of the system increases. But when the bubble rises in the direction of upthrust force then system works so the potential energy of the system decreases.
Promotional Banner

Topper's Solved these Questions

  • WORK , ENERGY , POWER AND COLLISION

    ERRORLESS |Exercise Ordinary Thinking (Objective Questions) (Power)|31 Videos

  • WORK , ENERGY , POWER AND COLLISION

    ERRORLESS |Exercise Ordinary Thinking (Objective Questions) (Elastic and Inelastic Collision)|68 Videos

  • WORK , ENERGY , POWER AND COLLISION

    ERRORLESS |Exercise Ordinary Thinking (Objective Questions) (Work Done by Variable Force)|26 Videos

  • WAVES AND SOUND

    ERRORLESS |Exercise SET|25 Videos

  • WORK, ENERGY, POWER & COLLISION

    ERRORLESS |Exercise Assertion|30 Videos

Similar Questions

Explore conceptually related problems

(a) What is the electric potential energy of two electrons separated by 3.00 nm? (b) If the separation increases, does the potential energy increase or decrease ?

Assertion : When two positive point charges move away from each other, then their electrostatic potential energy decreases. Reason : Change in potential energy between two points is equal to the work done by electrostatic forces.

As an electron makes a transition from an excited state to the ground state of a hydrogen like atom/ion (a) kinetic energy, potential energy and total energy decrease (b) kinetic energy decreases, potential energy increases but total energy remains same (c ) kinetic energy and total energy decrease but potential energy increases (d) its kinetic energy increases but potential energy and total energy decrease

Assertion: When two unlike charges are brought nearer, their electrostatic potentiasl energy decreases. Reason: All conservative forces act in the direction of decreasing potential energy.

Asseration : If work by done conservative forces is positive, kinetic energy will increase. Reason : Because potential energy will decrease.

ERRORLESS -WORK , ENERGY , POWER AND COLLISION-Ordinary Thinking (Objective Questions) (Conservation of Energy and Momentum)
  1. If velocity of a body is twice of previous velocity, then kinetic ener...

    Text Solution

    |

  2. Two bodies A and B having masses in the ratio of 3 : 1 possess the sam...

    Text Solution

    |

  3. In which case does the potential energy decrease ?

    Text Solution

    |

  4. A shere of mass m , moving with velocity V, enters a hanging bag of sa...

    Text Solution

    |

  5. Two bodies of masses m and 2m have same momentum. Their respective kin...

    Text Solution

    |

  6. If a lighter body (mass M(1) and velocity V(1) ) and a heavier body (m...

    Text Solution

    |

  7. A frictionless track ABCDE ends in a circular loop of radius R . A bod...

    Text Solution

    |

  8. The force constant of a weightless spring is 16 N m^(-1). A body of ma...

    Text Solution

    |

  9. Two bodies with kinetix energies in the ratio of 4 : 1 are moving with...

    Text Solution

    |

  10. The kinetic energy of a body becomes four times its initial value.The ...

    Text Solution

    |

  11. Assertion : A bullet is fired from a rifle. If the rifle recoils fre...

    Text Solution

    |

  12. If the water falls from a dam into a turbine wheel 19.6 m below, then...

    Text Solution

    |

  13. Two bodies of masses 2 m and m have their K.E. in the ratio 8 : 1, the...

    Text Solution

    |

  14. A bomb of 12 kg divides in two parts whose ratio of masses is 1 : 3. I...

    Text Solution

    |

  15. A 4 kg mass and a 1 kg mass are moving with equal kinetic energies. Th...

    Text Solution

    |

  16. Two identical cylindrical vessels with their bases at the same level e...

    Text Solution

    |

  17. If the increase in the kinetic energy of a body is 21%, then the incre...

    Text Solution

    |

  18. If a body of mass 200 g falls a height 200 m and its total P.E. is con...

    Text Solution

    |

  19. If momentum is increased by 20% then K.E. increases by

    Text Solution

    |

  20. The kinetic energy of a body of mass 2 kg and momentum of 2 Ns is

    Text Solution

    |