Research study in senior high school: physics and toys and their improvement. Find out the relationship between toys and physics in life, and give detailed examples, preferably with schematic diagrams

Research study in senior high school: physics and toys and their improvement. Find out the relationship between toys and physics in life, and give detailed examples, preferably with schematic diagrams. Physics is closely related to toys or household appliances. For example, most electric bicycles can't help. When using electricity, the speed of the pedal can't keep up. This is mainly because the diameter ratio of the driving wheel and the driven wheel is not well designed, and a great cause can be completed with a little change.