This document discusses different types of forces including contact forces like pushing and pulling, and non-contact forces like magnetism and gravity. It explains that contact forces can make objects start or stop moving, move faster or slower, or change direction. Non-contact forces like magnetism and gravity act over a distance without touching. The document also covers different forms of energy including motion, light, heat, electrical, chemical, and sound energy, as well as renewable vs non-renewable energy sources.

4. Force is pushing and pulling things. This
forces are called contact forces because
they require touch.
PUSHING
PULLING

5. Contact forces can also stop things.

6. Contact forces can make an object start
moving, stop moving, move faster, move
slower or change direction.
The children apply a force
to make their bicycles go
faster.
The dog applies a
force to stop the
ball.
The crane applies a
force to lift the car.

7. Contact forces can change the shape of some
objects. They can also break them.
Depending on the force applied
and the material of the object, it...
…breaks.
…changes shape but
returns to its original
shape when the force
is removed.
…changes shape
forever.
…doesn’t change
shape.

8. Magnets create magnetic forces. They
are non-contact forces.
Magnets attract metallic objects and make
them move without touching them.
There are natural
magnets, like
magntetite, and
man-made
magnets.

9. All magnets have 2 ends, called the north
pole and the south pole.
If we put
opposite
poles of
magnets
together,
the attract
each other.
If we put
same poles
of magnets
together,
they repel
each other.

10. Many products of our daily life have
magnets.
A compass uses
a magnet to find
north.
Magnets are
used in watches.
Bank cards have a
magnetic band.

11. Gravity is a non-contact force. It is a force
of attraction that pulls all objects towards
the centre of the Earth.
The Earth’s
gravity stops us
from floating
away. It makes
rain fall and
keeps the water
in the oceans.

12. Because of gravity...
...we
stay on
the
ground
...everything that goes up
comes back down.
...the
apple
falls on
the
boy’s
head.
...we
can’t lift
objects
with a
large
mass.

13. As you move away from the Earth, the
force of gravity is weaker. In space there is
so little gravity that people and objects
float!
How do you wash your hair on the space?
http://www.youtube.com/watch?v=kOIj7AgonHM
Can you cry on the space?
http://www.youtube.com/watch?v=1v5gtOkyCG0

15. Energy is the ability to do work. Any change
needs energy.
All living things need energy to live.
Machines and tools use energy to work.

16. There are 6 main forms of energy:
MOTION
ENERGY
ELECTRICAL
ENERGY
SOUND
ENERGY

17. There are 6 main forms of energy:
CHEMICAL
ENERGY
HEAT
ENERGY
LIGHT
ENERGY

18. Which form of energy is this?
CHEMICAL
ENERGY
LIGHT
ENERGY
HEAT ELECTRICAL
ENERGY ENERGY

19. Which form of energy is this?
LIGHT
ENERGY
HEAT
ENERGY
MOTION
ENERGY
SOUND
ENERGY

20. Which form of energy is this?
MOTION
ENERGY
SOUND
ENERGY

21. The main sources of energy can be divided
into 2 groups:
NON-RENEWABLE
COAL
PETROLEUM
NATURAL GAS
RENEWABLE
SOLAR ENERGY
HYDRO ENERGY
WIND ENERGY
BIOENERGY

22. They are found under the ground.
Because they are consumed very fast, they
will run out.
C
O
A
L
P
E
T
R
O
L
E
U
M
N
A
T
U
R
A
L
G
A
S

23. This energy sources are always available.
They will never run out.
SOLAR
ENERGY
WIND
ENERGY
BIOMASS
HYDRO
ENERGY

24. Our lifestyle affect the amount of energy
we use. To do this we must follow the 3 Rs:
REDUCE
REUSE
RECYCLE