Grade 11 QUESTION 5
28 kg
A stationary 28 kg block is
connected to an EMPTY 1 kg
bucket by a light, inextensible
cord running over a frictionless
pulley. The coefficient of static
friction between the table and
the block is 0,45 and the
coefficient of kinetic friction
between the table and the block
is 0,32. Sand is gradually added
to the bucket until the system is
AT THE POINT of moving.
9 kg
5.1 State Newton's second law of motion in words.
(2)
5.2
Draw a labelled free-body diagram of all the forces acting on the 28 kg
block.
(4)
5.3 Calculate:
5.3.1 The MINIMUM force required TO MOVE the 28 kg block.
(4)
5.3.2 The MINIMUM mass of SAND needed in the bucket in order to
move the 28 kg block.
(4)
5.3.3 The acceleration of the system if 12,6 kg of sand is in the bucket.
(5)
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