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Bicycle brakes A set of caliper brakes exerts a force on
Chapter 10, Problem 57E(choose chapter or problem)
Bicycle brakes A set of caliper brakes exerts a force on the rim of a bicycle wheel that creates a frictional force F of 40 N (see figure). Assuming the wheel has a radius of 66 cm, find the magnitude and direction of the torque about the axle of the wheel.
Questions & Answers
QUESTION:
Bicycle brakes A set of caliper brakes exerts a force on the rim of a bicycle wheel that creates a frictional force F of 40 N (see figure). Assuming the wheel has a radius of 66 cm, find the magnitude and direction of the torque about the axle of the wheel.
ANSWER:
Solution 57E
Step 1 of 3;
In this problem we need to find the magnitude and direction of the torque about the axle of the wheel .
From the given figure , the frictional force of the wheel F = 40N acts perpendicular to the action of the brakes from the center of the wheel .
Given the radius of the wheel is r = 66cm
= m
= 0.66m
The action of the brakes is upwards from the center of the wheel and the frictional force is perpendicular to the action of brakes .
So , let us assume the action of brakes is along the z -axis , frictional force is along the positive y - axis, then the torque is perpendicular to both these actions .