Final answer:
The shape of a grindstone used for grinding is a Solid Disk. This shape provides a stable and uniform surface for sharpening and grinding various tools in a workshop setting.
Step-by-step explanation:
The shape of a grindstone used for grinding is a Solid Disk. Grindstones are typically used in workshops for sharpening tools and they have to be solid and stable to withstand the forces applied during the grinding process. The solid disk shape provides a large surface area that can be used to grind tools evenly.
For example, an ordinary workshop grindstone might have a radius and is rotated at high speeds to achieve efficient grinding. When a force is applied tangentially to this grindstone, it can be used to calculate various physical properties such as angular acceleration, the number of turns before coming to rest, or even the power provided by the motor to keep it at a constant rotation rate. These calculations are based on principles of physics like friction, rotational motion, and energy.