Calculating Flywheel Speed in a Hybrid Vehicle: A Homework Challenge

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Homework Help Overview

The discussion revolves around calculating the speed of a flywheel in a hybrid vehicle, specifically focusing on the energy transfer from the car to the flywheel during braking. The problem involves concepts from mechanics and energy conservation.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants are considering the relationship between kinetic energy and rotational kinetic energy, with some uncertainty about which equations to apply. There is mention of uniform angular acceleration and centripetal force, but clarity on their relevance is lacking.

Discussion Status

Some participants have offered hints related to energy concepts, suggesting a focus on the conversion of kinetic energy to rotational energy. Others are seeking further assistance and clarification on the problem, indicating a collaborative effort to understand the topic better.

Contextual Notes

There is a mention of the assumption of 100% efficiency in the energy transfer process, which may influence the approach to the problem. Additionally, some participants express feeling lost regarding Newton's laws and the relevant equations.

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Homework Statement



In a hybrid vehicle a flywheel is used to capture the energy of the car during braking. If the car has a total mass of 850kg and the flywheel has a mass-moment of inertia equal to 14kgm2 determine the speed of the flywheel when the car stops for traffic lights in an urban area (you may assume 100% efficiency).

Homework Equations



Not sure

I am thinking an equation for Uniform Angular Acceleration.

Or

Centripetal force

I am stuck on what one to use

The Attempt at a Solution



If i can get some hints, i would like to have a stab at this one, i am just 100% lost in Newtons laws and other equations...
 
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Think of energy. The kinetic energy of the car has to turn into rotational kinetic energy of the flywheel.
 
I will post what i have done in a few hours, thanks for the hint...
 
Hi could you post your results or someone offer some help as i am having problems with the exact same question.

thank you
 

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