Giancoli's Physics: Principles with Applications, 6th Edition
8
Rotational Motion
Change chapter8-1: Angular Quantities
8-2 and 8-3: Constant Angular Acceleration; Rolling
8-4: Torque
8-5 and 8-6: Rotational Dynamics
8-7: Rotational Kinetic Energy
8-8: Angular Momentum
8-9: Angular Quantities as Vectors
Problem 22
A
a)
b) pull up on the handle bars or buy a longer pedal crank
b) pull up on the handle bars or buy a longer pedal crank
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COMMENTS
By petradanek11 on Wed, 4/23/2025 - 12:46 AM
Hi Mr. Disco I really like your videos, my only question is why does pulling up on the handle bars help or buying a larger crank? Thanks!
By Mr. Dychko on Fri, 7/4/2025 - 7:08 PM
Hi petradanek, thank you for this question and sorry for such a late reply. Pulling up on the handle bars (the person's hands apply an upward force on the handle bars in other words) results in a Newton's third law reaction force of the handle bars pushing down on the person's hands. This reaction force down adds to gravity to increase the total force applied to the pedal.
Increasing the length of the crank connecting the pedal to the bottom bracket (the axis, in other words) increases the torque.
All the best,
Shaun
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