Compound machines are made of two or more simple machines working together to perform a task. They can combine the functions of inclined planes, pulleys, levers, wheels and axles, screws, and wedges to make work easier.
Rube Goldberg created a complex machine, known as a Rube Goldberg machine, that performs a simple task in a convoluted way. In this context, the rake in "How to Keep Shop Windows Clean" is likely just a regular garden rake, which is a simple machine categorized as a lever.
A doorknob is not considered a machine; it is a simple mechanical device designed to open and close doors. It is typically made of materials such as metal or plastic and operates through manual turning or twisting to latch or unlatch a door.
A ceiling fan is a compound machine because it is made up of multiple simple machines. It typically includes an electric motor (a form of a wheel and axle) that drives the blades (a form of a lever) to create airflow, making it a combination of several simple machines working together.
Venetian blinds are made with pulleys.
a umbrella can be a simple machine but it depends on how it's made
A compound machine.
A compound machine.
"compound machine" or "compound"
Venetian blinds are made with pulleys.
A simple machine made from wheels and ropes is a pulley.
coumpound machine
That isn't a simple machine, it is a complex machine, made up of other simple machines.
plastic can be made into simple machines, but no plastic itself isn't a simple machine.
Compound machines are things that are made up of 1 or more simple machines. A screw isn't made up of any simple machines unless you count the screw as a simple machine.
it's a screw because it is sort of a wedge and it has very thin inclined planes swirled around it.
Complex machine
A compound machine.