WHY ARE SPOKES PROVIDED IN A BICYCLE WHEEL?
QUESTION: Why are spokes provided in a bicycle wheel?
The spokes of cycle wheel increases its moment of inertia. If it is a disc some mass will be very near to axis of rotation. Due to spokes maximum mass for rim leads to more moment of inertia, greater is the opposition to any change in uniform rotational motion. As a result the cycle runs smoother and steadier. if the cycle wheel had no spokes, the cycle would be driven in jerks and hence unsafe.
- Is it necessary that a mass should be present at the center of mass of any system?
No. It is not necessary to have some mass at center of mass of the system.
Eg: For bangle or ring center of mass is at its center but there is no mass particle at center of mass.