Question

2.1.3 list 3 of your own examples of compound machines. (remember: machines help make work easier.)

Explanation:

A compound machine is made of two or more simple machines. A bicycle uses wheels (simple machine: wheel and axle) and gears (simple machine: gear, a type of wheel and axle or also related to levers in transmission) and brakes (simple machine: lever). A pair of scissors uses two levers (simple machine: lever) and also the blades act as wedges (simple machine: wedge). A wheelbarrow uses a wheel and axle (simple machine: wheel and axle) and a lever (the handle part acts as a lever to lift the load).

Answer:

1. Bicycle (combines wheels (wheel - and - axle), gears (wheel - and - axle - like mechanism), and brakes (lever)).
2. Pair of scissors (combines two levers and two wedges (the blades)).
3. Wheelbarrow (combines a wheel - and - axle and a lever).