A 'perpetual motion machine' that can continue working without applying energy from outside is impossible in the real world. However, figurines that look like perpetual motion machines are being sold ...

What is a wheel and axle mechanism? A wheel and axle mechanism is a simple device you make when you connect one or more wheels to an axle. They are used to help things move. A wheel is a round, flat ...

A cam is a rotating piece that converts rotary motion into reciprocating motion in the follower. Think of it like a spinning shape pushing something up and down. Eccentric/off centre cam: this is the ...