### Types of Simple Machines : - Year 6 and 7 Mathematics

```- Megastructures don’t build themselves.
- From the ancient Egyptians to modern
day Emirati, machines have always been
used to create our mega masterpieces.
- What mechanics were used in ancient
times?
- What mechanics are used today?
Engineers use scientific knowledge to design
and build machines that make our lives easier,
bridges that carry heavy loads, and buildings
that don’t fall over.
A machine is a device that makes a physical
task easier (eg. cars, bikes, cranes, lifts and
escalators) to do.
SIMPLE MACHINES: is a machine with few
or no moving parts to which you apply just
one force (wheelbarrow, .
Types of Simple Machines:
1. Lever
2. Pulley
3. Wedge
4. Wheel and axle
5. Screw
6. Inclined plane
- Can-openers, scissors, tongs, spanners,
hammers, brooms, tennis racquets and staplers
are examples of levers.
- A lever is a simple machine that uses the
turning effect of a force. It is a bar that pivots
on a fixed point. Eg hockey stick, seesaw,
prybar)
- The turning (fixed) point of a lever is called a
fulcrum.
- The resistance to motion that a lever works
- The force used to cause movement is called an
effort.
-Many of the bones in your own body are levers.
- The long bones in your arms and legs are the
most obvious examples of levers.
- Joints such as your elbow or knee act as
fulcrums.
-Your muscles pull on parts of the bone to create
the effort.
- The load is the resistance to motion that your
bone works against (eg. a basketball, a bucket of
water or a heavy weight at the gym).
-When you bend your arm to lift a weight,
the effort is provided by your biceps
muscle where it joins a bone called the