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2. In the diagram of a windscreen wiper mechanism shown below, the rotation of the

wheel produces an oscillating motion of the lever OA. Points O and C are fixed

and the angular velocity (w) of the wheel is constant at 150 rad/s. The lengths of

the links are AB = 80 mm and OA =30 mm, the radius BC = 20 mm and distance

OC =60 mm.

i)

ii)

Construct a vector diagram of the mechanism as shown

Calculate the following:

a) The angular velocity of the link OA and the absolute velocity of point A.

b) The radial acceleration of OA.

c) The magnitude and the direction of the acceleration of point A.

Fig: 1