The piston moves a rod forwards and backwards. This rod turns the first wheek and the second wheel turns because it is connected to the first wheel by another rod.
Crankshaft mechanism: we can connect multiple rods to one shaft, the rods are connected to cranks and the cranks are connected to the crankshaft. A crankshaft mechanism can synchronise the movements of various parts.
Cam mechanism: a cam is an irregularly shaped device that rotates on a shaft. When the cam rotates, it pushes a special bar called a follower. The follower can move other parts or it can turn a switch on and off. We can put multiple cams on one shaft, called a camshaft.
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