<Li> ρ (\ displaystyle \ rho) is the density of the cylinder </Li> <Li> r (\ displaystyle r) is the radius of the cylinder, and </Li> <Li> ω (\ displaystyle \ omega) is the angular velocity of the cylinder . </Li> <P> Flywheels are made from many different materials, the application determines the choice of material . Small flywheels made of lead are found in children's toys . Cast iron flywheels are used in old steam engines . Flywheels used in car engines are made of cast or nodular iron, steel or aluminum . Flywheels made from high - strength steel or composites have been proposed for use in vehicle energy storage and braking systems . </P>

Where is a flywheel located on the car