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Standard XII

Physics

Net Force

A body of mas...

Question

A body of mass $2$ $k g$ is placed on a horizontal surface having coefficient of kinetic friction $0.4$ and coefficient of static friction $0.5$ . If a horizontal force of $2.5$ $N$ is applied on the body, the minimum force required to slide the body is( take $g = 10 m / s^{2}$ ) :

8 N

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10 N

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20 N

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2.5 N

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Solution

The correct option is C 10 N
Given:
$m = 2 k g μ_{k} = .4 μ_{s} = .5 F = 2.5$
Normal force acting on the body
$N = m g$
$N = 2 \times 10$
$N = 20 N$

Static Frictional Force
$f_{m a x} = c o e f f i c i e n t o f s t a t i c F r i c t i o n \times N o r m a l f o r c e$
$f_{m a x} = 0.5 \times 20$
$f_{m a x} = 10 N$
If applied force is just greater then the $f_{m a x} = 10$ then body will start to move

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A body of mass 2 kg is placed on a horizontal surface having coefficient of kinetic friction 0.4 and coefficient of static friction 0.5. If a horizontal force of 2.5 N is applied on the body, the minimum force required to slide the body is( take g=10m/s2) :

The correct option is C 10 NGiven:m=2kgμk=.4μs=.5F=2.5Normal force acting on the bodyN=mgN=2×10N=20NStatic Frictional Forcefmax=coefficient of static Friction×Normal forcefmax=0.5×20fmax=10N If applied force is just greater then the fmax=10 then body will start to move

A body of mass $2$ $k g$ is placed on a horizontal surface having coefficient of kinetic friction $0.4$ and coefficient of static friction $0.5$ . If a horizontal force of $2.5$ $N$ is applied on the body, the minimum force required to slide the body is( take $g = 10 m / s^{2}$ ) :