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Question

A block of mass 4kg is placed in contact with the front vertical surface of a lorry. The coefficient of friction between the vertical surface and block is 0.8 .The lorry is moving with an acceleration of 15 m/s2 .The force of friction between lorry and block is (g=10m/s2)

A
48N
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B
24N
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C
40N
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D
Zero
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Solution

The correct option is A 48N

The friction force between the lorry and block is given as,

F=μma

=0.8×4×15

=48N

Thus, the friction force between the lorry and block is 48N.


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