A block of mass $1 k g$ lies on a horizontal surface in a truck, the coefficient of static friction between the block and the surface is $0.6$ . What is the force of friction on the block if the acceleration of the truck is $5 m / s^{2}$ ?
(Take $g = 10 m / s^{2}$ )

5 N

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6 N

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7 N

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8 N

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Solution

The correct option is A $5 N$
Maximum frictional force acting $= μ m g = 0.6 \times 1 \times 10 = 6 N$
Pseudo force acting on the body $= m a = 1 \times 5 = 5 N$
$∵$ pseudo force $<$ frictional force
The frictional force acting is only $5 N$ .

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Q. Fill in the blanks.
A block of mass

1 k g

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0.6.

If the acceleration of the truck is

5 m / s^{2},

the frictional force acting on the block is ........ Newtons.

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A block of mass 1 kg lies on a horizontal surface in a truck, the coefficient of static friction between the block and the surface is 0.6. What is the force of friction on the block if the acceleration of the truck is 5 m/s2 ?(Take g=10 m/s2)

The correct option is A 5NMaximum frictional force acting =μmg=0.6×1×10=6NPseudo force acting on the body =ma=1×5=5N∵ pseudo force < frictional forceThe frictional force acting is only 5N.

A block of mass $1 k g$ lies on a horizontal surface in a truck, the coefficient of static friction between the block and the surface is $0.6$ . What is the force of friction on the block if the acceleration of the truck is $5 m / s^{2}$ ?
(Take $g = 10 m / s^{2}$ )

The correct option is A $5 N$
Maximum frictional force acting $= μ m g = 0.6 \times 1 \times 10 = 6 N$
Pseudo force acting on the body $= m a = 1 \times 5 = 5 N$
$∵$ pseudo force $<$ frictional force
The frictional force acting is only $5 N$ .