QUESTION 1 A 20 kg block, resting on rough horizontal surface, is connected to blocks P and Q by a light
inextensible string, moving over a frictionless pulley. Blocks P and Q are glued together and
have a combined mass of m. A force of 35 N is now applied to the 20 kg block at an angle of 40°
with the horizontal as shown below.
35 N
20 kg
P
The 20 kg block experiences a frictional force of magnitude of 5 N as it moves to the RIGHT at a
CONSTANT SPEED.
(2)
Calculate the combined mass m of the two blocks