Once the lorry has reached its destination, the back of the lorry is tilted at an angle 8
to the horizontal.
Three forces act on the box: the weight W, the normal contact force R and the
frictional force F
(i) State expressions for the components of the weight of the box parallel to the back
of the lorry and perpendicular to the back of the lorry.
(2)
W
parallel
W
perpendicular
(ii) The angle is increased until the box is just about to slide.
Given that F= 0.32R, calculate the value of at which the box is just about to slide.
W=200g
Answers: 3
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Once the lorry has reached its destination, the back of the lorry is tilted at an angle 8
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