Recent content by ollie_craw

Would the force applied also be times the sin of the angle if you're going uphill?

Just realized I'm wrong. What equations would I need to have acting against the bike? For the force of gravity would it just be mass times g times sin of the angle?

You're incorrect on the gear ratios part. It needs to be used in the equation and it is the rear sprocket divided by the front chainring

Homework Statement I think that the equation for the force someone exerts on their bike pedals or the force forward is stated below. can anyone confirm this is true? Homework Equations Fapplied by rider = (weight of rider) (Radius Crank /Radius Tire) (Gear Ratio) The Attempt at a Solution

How do I calculate the PE?

It would I believe. The gain in potential energy would in theory be the same tho

I really just need the equations right now .

The only part I don't understand is how to find the force wheel. How does it relate to the angle? Secondly, on post 7 you mention the pedal force would be related to the radius of the rear wheel and crank etc. Does that mean they are multiplied? The problem I'm having now isn't with the...

I think I am slowly getting the hang of it! :) how do we find the the force wheel? I understand how you're getting to the force applied to the pedal which is ultimately the thing I am going to solve for with all my data so I can find out what gear is best for which hill!

Sorry forgot to reply to you directly.

Yes! I know free body diagrams well and I understand the concepts you are mentioning. The only part I am confused on is the actual calculations and formula of finding the force needed by the biker to summit the hill (I assume that's what the drive force is?)

How do you calculate the Force of the driven wheel?

Homework Statement Hi there, I am doing a project for my physics class where I am attempting to calculate the amount of force and work required to go up a 10% grade hill in a variety of different gears and I am running into a lot of issues. I have already collected my data and have calculated...

Okay great! Thanks for helping me with some of the ideas. You don't this this project is crazy right? I'm just feeling a little lost and the things you said sounded like they were on the right track for me. Is there anyway you think I could measure efficiency from this experiment? (calories...

Okay. Let me rephrase my question then. What sort of equations and graphs could I design surrounding gear ratios and bicycle movement up a hill in different gears? Would rotational velocity be appropriate? How about torque?