A football player is moving southward and suddenly turns eastward with same speed to avoid an oppone

English

Gujarati

Hindi

4-2.Friction

medium

A football player is moving southward and suddenly turns eastward with the same speed to avoid an opponent. The force that acts on the player while turning is :

Aalong south-west

Balong eastward

Calong northward

Dalong north-east

(NEET-2023)

Solution

$\overrightarrow{ V }_{ i }=( V ) \text { southward }$
$\overrightarrow{ V }_{ F }=( V ) \text { Eastward }$
$\overrightarrow{\Delta V }=\overrightarrow{ V }_{ F }-\overrightarrow{ V }_{ i }$
$=\text { Along North – East }$

Standard 11

Physics

A block of mass $5$ kg lies on a rough horizontal table. A force of $19.6\, N$ is enough to keep the body sliding at uniform velocity. The coefficient of sliding friction is

easy

A sphere of mass $m$ is set in motion with initial velocity $v_o$ on a surface on which $kx^n$ is the frictional force with $k$ and $n$ as the constants and $x$ as the distance from the point of start. Find the distance in which sphere will stop

hard

Block $B$ of mass $100 kg$ rests on a rough surface of friction coefficient $\mu = 1/3$. $A$ rope is tied to block $B$ as shown in figure. The maximum acceleration with which boy $A$ of $25 kg$ can climbs on rope without making block move is:

normal

Write relation between coefficient of static friction, kinetic friction and rolling friction.