Block P, of mass 2 kg, is connected to block Q, of mass 3 kg, by a light inextensible string. Both blocks are on a plane inclined at an angle of 30°to the horizontal.
Block Q is pulled by a constant force of 40 N at an angle of 25° to the incline.
Block P moves on a rough section, AB,of the incline, while block Q moves on a frictionless section, BC, of the incline. See diagram below.
An average constant frictional force of 2,5 N acts on block P as it moves from A to B up the incline.
2.1 State Newton’s Second Law in words. (2)
2.2 Draw a labelled free-body diagram for block P. (4)
2.3 Calculate the magnitude of the acceleration of block P while block P is moving
on section AB. (8)
2.4 If block P has now passed point B, how will its acceleration compare to that calculated in QUESTION
2.3? Choose from GREATER THAN, SMALLER THAN or EQUAL TO.
Give a reason for the answer. (2)
[16]