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Standard XII

Physics

Block on a Block Problems

A block of ma...

Question

A block of mass $1 k g$ lies on a horizontal surface in a truck. The coefficient of friction between the block and surface is $0.5.$ If the acceleration of the truck is $6 m s^{- 1}$ the acceleration of the block relative to ground is:

6 m / s^{2}

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1.1 m / s^{2}

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4.9 m / s^{2}

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0 m / s^{2}

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Solution

The correct option is C $4.9 m / s^{2}$
Force acting on the block =ma- $μ$ mg= $1 \times 6 - 0.5 \times 1 \times 9.8 = 1.1 N = 1 \times a c c$
Acceleration $= 1.1 m / s ²$ with respect to truck
Acceleration with respect to ground $= 6 - 1.1 = 4.9 m / s ²$

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A block of mass $1 k g$ lies on horizontal surface in a truck. The coefficient of static friction between the block and the surface is $μ_{s} = 0.6$ . If the acceleration of the truck is $5 m / s^{2}$ , the friction force acting on the block is

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A block of mass 1kg lies on a horizontal surface in a truck. The coefficient of friction between the block and surface is 0.5. If the acceleration of the truck is 6ms−1 the acceleration of the block relative to ground is:

The correct option is C 4.9 m/s2Force acting on the block =ma-μmg=1×6−0.5×1×9.8=1.1N=1×accAcceleration=1.1m/s² with respect to truckAcceleration with respect to ground=6−1.1=4.9m/s²

A block of mass $1 k g$ lies on a horizontal surface in a truck. The coefficient of friction between the block and surface is $0.5.$ If the acceleration of the truck is $6 m s^{- 1}$ the acceleration of the block relative to ground is:

The correct option is C $4.9 m / s^{2}$
Force acting on the block =ma- $μ$ mg= $1 \times 6 - 0.5 \times 1 \times 9.8 = 1.1 N = 1 \times a c c$
Acceleration $= 1.1 m / s ²$ with respect to truck
Acceleration with respect to ground $= 6 - 1.1 = 4.9 m / s ²$