Question

3 kg block is resting on a truck moving with acceleration of 2 m/s2 on a horizontal road. Force of friction on the block is
(1) Zero
(2) 4 N
(3) 6 N
(4) 8N
corrcet ans is 6N. plz provide explanation as well. thanks
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Answer 1

Explanation:

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Answer 2

Answer:

Option 3 is correct.

Explanation:

Maxmimum force of friction on the block can be = $\mu mg$

where, $\mu$ is coefficient of friction

$m$ is the mass of the block,

$g$ is accleration due to gravity.

As, the truck is moving with an acceleration of $2m/s^2$ and block is at rest, then the force applied due to friction must be equal to pseudo force due to movement of the truck. Only when the two forces are equal, can the block be at rest.

i.e. Frictional force = $m*a = 3*2= 6N$

Therefore, (3) is the correct option.

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