Page 52 - Science Course 2 (Book 2)

Mo9-L2b: What are Complex Machines?

Can you name the simple machines that make up
Mo9-L2b What are Complex Machines? this complex (compound) machine?

KEY CONCEPTS: A bicycle is an example of a complex machine.
1. In what ways can machines make work easier?

pedals turn The handles
Vocabulary A-Z and crank are are levers
levers
Let us learn some vocabulary

complex machine
is two or more simple machines working together.

The pulley changes The front wheel is a
the chain direction wheel and axle
and turns the wheel

The pedals turn a
wheel and axle

Let’s Begin Machines and Work

The work you do on a machine is called the input
Machines Transfer Mechanical Energy work.

Two or more simple machines working together are The work the machine does on an object is the out-
a complex machine. put work.

Complex machines use more than one motion to
accomplish tasks.

Machines make work easier by changing the
distance the object moves or the force required
to do work on an object.

44