Home
Class 12
PHYSICS
Assertion: When brakes are applied on a ...

Assertion: When brakes are applied on a wet road, a car is likely to skid.
Reason: Brakes prevent rotation of the wheels, and there is not sufficient friction between the road and the whells.

A

If both assertion `&` Reason are True `&` the Reason is a corrrect explanation of the Asserion.

B

If both Assertion `&` Reason are True but Reason is not correct explanation of the Assertion.

C

If Assertion is Trie but the Reason is False.

D

If both Assertion `&` Reason are false

Text Solution

Verified by Experts

The correct Answer is:
A

Sidding takes place because of insufficient friction.
Promotional Banner

Topper's Solved these Questions

  • NEWTONS LAWS OF MOTION

    ALLEN |Exercise EXERCISE-II|112 Videos
  • NEWTON'S LAWS OF MOTION & FRICTION

    ALLEN |Exercise EXERCISE (JA)|4 Videos
  • RACE

    ALLEN |Exercise Basic Maths (Wave Motion & Dopplers Effect) (Stationary waves & doppler effect, beats)|25 Videos

Similar Questions

Explore conceptually related problems

A man of mass 80kg pushes box of mass 20kg horizontaly. The man moves the box with a constant acceleration of 2 m//s^(2) but his foot does not slip on the ground. There is no friction between the box and the ground. There is no friction between the box and the ground. whereas there is sufficient friction between the man's foot and the ground to prevent him from slipping. Assertion:- The force applied by the man on the box is equal and opposite to the force applied by the force applid by the box on the man. Reason:- Friction force applied by the ground on the man is 200N.

The mass of a car is 1200 kg. It comes to rest due to retardation of 2 ms^(-2) . What would be the force (frictional force) acting between the car and road ?

Find the maximum speed at which a car can take turn round a curve of 30 cm radius on a level road if the coefficient of friction between the tyres and the road is 0.4. Take g = 10 ms^(-2) .

Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2

An engine is attached to a wagon through a shock absorber of length 1.5 m . The system with a total mass of 50,000 kg is moving with a speed of 36 ^kmh(-1) when the brakes are applied to bring it to rest, the spring of the shock absorber gets compressed by 1.0 m. If 90 % of energy of the wagon is lost due to friction, calculate the spring constant.

A car is moving along a banked road laid out as a circle of radius r . (a) What should be the banking angle theta so that the car travelling at speed v needs no frictional force from tyres to negotiate the turn ? (b) The coefficient of friction between tyres and road are mu_(s) = 0.9 and mu_(k) = 0.8 . At what maximum speed can a car enter the curve without sliding toward the top edge of the banked turn ?

Assertion :- When a man climbs the rope friction force acts in downward direction. Reason :- Friction force opposes relative motion to tendency of relative motion between two contact surfaces.

Assertion: When a force vecF attempts to slide a body along a surface, a frictional force parallel to the surface and directed so as to oppose the sliding, is exerted on the body by the surface. Reason: It is due to the bonding between the body and the surface.

ALLEN -NEWTONS LAWS OF MOTION-EXERCISE-III
  1. Assertion: Frictional force is the component of contact force parallel...

    Text Solution

    |

  2. Assertion: Newton's first law can be derived from the second law. Re...

    Text Solution

    |

  3. These questions consists of two statements each printed as Assertion a...

    Text Solution

    |

  4. Assertion: Pseudo force is an imaginary force which is recongnised on...

    Text Solution

    |

  5. Assertion: A table cloth can be pulled from a table without dislodding...

    Text Solution

    |

  6. Assertion: Friction is a self-adjusting force. Reason: A block on th...

    Text Solution

    |

  7. Assertion: The apparent weight of a person standing in a lift which mo...

    Text Solution

    |

  8. Assertion: A body of weight 10N (W) is at rest on an inclined plane (m...

    Text Solution

    |

  9. Assertion: When a force vecF attempts to slide a body along a surface,...

    Text Solution

    |

  10. Assertion: Mass is a property of one object alone, whereas weight resu...

    Text Solution

    |

  11. Assertion: When brakes are applied on a wet road, a car is likely to s...

    Text Solution

    |

  12. Assertion : The force of tension on a body always act away from the bo...

    Text Solution

    |

  13. Assertion: It is difficult to move a heavy box by sliding whereas it b...

    Text Solution

    |

  14. Assertion: Every mutual intraction between two bodies always follow th...

    Text Solution

    |

  15. Assertion: Static slides down an inclined plane if the angle of fricti...

    Text Solution

    |

  16. Assertion: Magnitude of the contact force is always greater than the m...

    Text Solution

    |

  17. Assertion: When a person walks on a rough surface, the frictional forc...

    Text Solution

    |

  18. Assertion: Newton's second law of motion gives the measurement of forc...

    Text Solution

    |

  19. Assertion: Pulling a lawn roller is easier than pushing it. Reason:P...

    Text Solution

    |

  20. Assertion: A man who falls from aheight on a cement floor receive more...

    Text Solution

    |