topic: simple machine Year: 4 and 6

2. • Wheel and axle
• Lever
• Wedge
• Pulley
• Gears
• Inclined plane
• Screw

4. • Machines are tools that help us to do
our work and make our lives easier.
• A simple machine is a device that
allows us to use less force to make
easier and faster.
• Machines can be classified into :
• simple machines
• complex machines

5. A simple machine is a
machine with few or
no moving parts.

6. Simple
Machines
Inclined
plane
Lever
Wheel and axle
Screw
Gear
Pulley
Wedge

7. Wheel and Axle
• A wheel and axle consists of a larger
wheel connected by a smaller cylindrical
rod (axle).
• Examples are door knobs, toy cars, cross
spanners, tap heads and steering wheels.
wheel
axle

9. Lever
• A lever consists of a straight rod or board
that attach on a point known as the
fulcrum.
• Examples are scissors, hammers and
wheelbarrows Effort
Load
Fulcrum

13. Inclined plane
• An inclined plane is a flat plane that
connects two other surfaces of different
levels.
• The examples are staircases and ramps.

16. Screw
• A screw has a spiral inclined plane called
thread.
• A use of a screw is to hold objects
together.
• The examples are a bolt and nut,
spanners and tap heads.

18. Gear
• A gear is a wheel or cylinder with teeth.
• The examples of gears are clocks, drills,
handheld egg beaters and watches.

20. Pulley
• A pulley is a way to use less effort or
energy to lift an object.
• A pulley consists of a grooved wheel that
can move freely.
• Pulleys are found in flag poles, cranes and
window blinds.

22. Wedge
• A wedge is a simple machine that has an
inclined plane on one or both sides of its
surfaces.
• Wedges are used to cut or split things.
• Examples are knives, nails, axes, door
stoppers and saws.