Assertion : On a rainy day it is difficult to drive a car or bus at high speed. Reason : value of co

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4-2.Friction

easy

$Assertion$ : On a rainy day it is difficult to drive a car or bus at high speed.
$Reason$ : The value of coefficient of friction is lowered due to wetting of the surface

AIf both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

BIf both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

CIf the Assertion is correct but Reason is incorrect.

DIf both the Assertion and Reason are incorrect.

(AIIMS-1999)

Solution

On a rainy day, the roads are wet. Wetting of roads lowers the coefficient of friction between the types and the road. Therefore, grip on a road of car reduces and thus chances of skidding increases.

Standard 11

Physics

$STATEMENT-1$ It is easier to pull a heavy object than to push it on a level ground. and

$STATEMENT-2$ The magnitude of frictional force depends on the nature of the two surfaces in contact.

medium

(IIT-2008)

A wooden block of mass $M$ resting on a rough horizontal surface is pulled with a force $F$ at an angle $\phi $ with the horizontal. If $\mu $ is the coefficient of kinetic friction between the block and the surface, then acceleration of the block is

hard

Given below are two statements:

$Statement$ $(I)$ : The limiting force of static friction depends on the area of contact and independent of materials.

$Statement$ $(II)$ : The limiting force of kinetic friction is independent of the area of contact and depends on materials.

In the light of the above statements, choose the most appropriate answer from the options given below:

medium

(JEE MAIN-2024)

A hockey player is moving northward and suddenly turns westward with the same speed to avoid an oopponent. The force that acts on the player is

easy

A block of mass $M = 5\,kg$ is resting on a rough horizontal surface for which the coefficient of friction is $0.2$. When a force $F = 40\,\,N$ is applied, the acceleration of the block will be …….. $m/\sec^2$ $(g = 10\,\,m/{\sec^2})$

hard

$Assertion$ : On a rainy day it is difficult to drive a car or bus at high speed. $Reason$ : The value of coefficient of friction is lowered due to wetting of the surface

Solution

Similar Questions

$STATEMENT-1$ It is easier to pull a heavy object than to push it on a level ground. and $STATEMENT-2$ The magnitude of frictional force depends on the nature of the two surfaces in contact.

A wooden block of mass $M$ resting on a rough horizontal surface is pulled with a force $F$ at an angle $\phi $ with the horizontal. If $\mu $ is the coefficient of kinetic friction between the block and the surface, then acceleration of the block is

A hockey player is moving northward and suddenly turns westward with the same speed to avoid an oopponent. The force that acts on the player is

A block of mass $M = 5\,kg$ is resting on a rough horizontal surface for which the coefficient of friction is $0.2$. When a force $F = 40\,\,N$ is applied, the acceleration of the block will be …….. $m/\sec^2$ $(g = 10\,\,m/{\sec^2})$

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$Assertion$ : On a rainy day it is difficult to drive a car or bus at high speed.
$Reason$ : The value of coefficient of friction is lowered due to wetting of the surface

$STATEMENT-1$ It is easier to pull a heavy object than to push it on a level ground. and

$STATEMENT-2$ The magnitude of frictional force depends on the nature of the two surfaces in contact.