A windmill turns slowly with constant speed in a gentle breeze. A cockroahc is o

Question

A windmill turns slowly with constant speed in a gentle breeze. A cockroahc is on the end of a windmill blade, and the frictional force between his feet and the windmill blades keeps him fixed to the blade without slipping.

A) When the cockroach is at the highest point in its motion, is the magnitude of the frictional force on the cockroahc greater than, lesser than, or equal to the weight of the cockroach? Explain.

B)When the cockroach is at the lowest point in its motion, is the magnitude of the frictional force on the cockroach greater than, lesser than, or equal to the weight of the cockroach? Explain.

C) What is the direction of the net force on the cockroach when he's at the bottom?

a) up

b)net acceleration =0

c) down

d) opposite direction of motion

e) in the direction of motion

Explanation / Answer

a). the magnitude of the frictional force on the cockroach will be lesser than the weight of the cockroach. b). the magnitude of the frictional force on the cockroach will be greater than the weight of the cockroach. c). in the upper direction to provide the centripetal acceleration for the circular motion.

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