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Dynamics

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A box of mass 12 kg is placed in the back of a van. The coefficient of friction between the box and the floor is 0.6. What happens to the box if the lorry moves off with an acceleration of:

(a) 4 ms^2
(b) 6 ms^2
(c) 8 ms^2

(Take g = 10 ms^-2)

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Forces acting on the box are as follows:

i) Weight mg downwards
ii) Normal reaction N
iii) Frictional force (forward dragging force) due to the floor of the van acting forward.
iv) Inertial force (pseudo force) ma acting backwards (a = ...

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