1. FORCES AND MACHINES
YEAR 3

2. FORCES AND WORK
• A force is a push or a pull that makes
an object do something. For example
when you kick a ball, the force of your
kick makes the ball move.

3. • An object moves faster when
we apply more force.
• We need to apply more force
when we move a heavier object.
• We use forces any time we
push, pull or lift objects.

5. DIFFERENT TYPES OF FORCES
GRAVITY
• When you jump up in the air, you drop
back down again. This is because
there’s an invisible force pulling you
down to the ground. This force is
called gravity.
• Gravity is the force that keeps you on
the ground.
• Without gravity, everything will float
into space.

6. Magnetism
• Magnetism is the force that magnets
produce.
• A magnet is a piece of metal that can
pull some other type of metal towards
it.
• Magnets have two ends. These are
called the north pole and the south
pole.

7. Magnetic attraction
• A north pole and a south pole always
pull towards each other. This is called
magnetic attraction.
• Two poles of the same type always
push each other away. This is called
magnetic repulsion.

8. Contact forces
• A contact force is a force between two
objects that are touching.
• Contact forces occur when one object
applies a force to another object.

9. Match the sentences
• A force is …. • …we apply a force.
• An object moves • …the center of the
when… Earth.
• Magnetism is the …. • …a pull or a push.
• Gravity pull objects • …force that magnets
towards… produce.

10. MACHINES
• A machine is a tool used to make work
easier.
• COMPLEX MACHINES are two or more
simple machines working together. The
have lots of moving parts.
• A bicycle is a complex machine.

12. Simple machines
• LEVER
A lever is a bar that moves on a point called
fulcrum. Moving the fulcrum changes the
weight of the object.

13. PULLEY
A pulley is a wheel with a rope. It changes
the direction of a pulling force. Pulling
down on the rope lifts the object on the
other end.

15. INCLINED PLANES
An inclined plane is a sloping surface, such
as a ramp. Incline planes can reduce the
force needed to move something.

16. Screws

17. Wheel and axle

18. Wedge