1-7 Forces in the universe

Forces in the universe 
(p. 20)
Bluetooth 
- ON
- VPN off

Stationary
- Writingbook
- Pen, pencil
- Calculator
- iPad

Mark
- NO


Lessonup
- YES
Schoolbags in
the cupboard
Phones in teh phone bag
1 / 16
suivant
Slide 1: Diapositive
NatuurkundeMiddelbare schoolvwoLeerjaar 3

Cette leçon contient 16 diapositives, avec quiz interactifs et diapositives de texte.

time-iconLa durée de la leçon est: 50 min

Éléments de cette leçon

Forces in the universe 
(p. 20)
Bluetooth 
- ON
- VPN off

Stationary
- Writingbook
- Pen, pencil
- Calculator
- iPad

Mark
- NO


Lessonup
- YES
Schoolbags in
the cupboard
Phones in teh phone bag

Slide 1 - Diapositive

Lesson goals:
  • Explain why the planets move around the sun.
  • Explan the difference between gravity and weight.
  • Explain what weightlessness is.

Slide 2 - Diapositive

Everything in the universe experiences gravitational force...

...not only the things on earth.

The moon also experiences
a gravitational force due to
the earth.

Slide 3 - Diapositive

Why does a planet not move away from the sun?

Because a planet is
attracted to the sun.

Slide 4 - Diapositive

Why does a planet not collide with the sun?

Because a planet moves with a 
high speed past the sun.


With each turning motion of a planet
there is a  centripetal force.

Slide 5 - Diapositive

Elliptical orbits
Almost circular.

Slide 6 - Diapositive

The difference between gravity and weight...
Gravity works on an object
itself and weight works on
the support, 
e.g. the surface, rope
or handles of a crate when
lifting.

Slide 7 - Diapositive

Weight
Weight is calculated with the the
equation


On earth it is g = 9,8 m/s2 but on other planet or on a star it is probably different.
G=Fz=mg

Slide 8 - Diapositive

Slide 9 - Diapositive

Mass
The amount of substance that something is made up of.

Slide 10 - Diapositive

Weightlessness
If you jump out of an aeroplane your
body is in free fall. 
Because your body is not supported
anywhere you feel weightless.

Slide 11 - Diapositive

What do we call the shape of the orbit a planet has around the sun.

Slide 12 - Question ouverte

Why does a planet not move away from the sun?
A
Gravity
B
Weight
C
Velocity
D
Support

Slide 13 - Quiz

Why does a planet not fall toward the sun?
A
Gravity
B
Weight
C
Velocity
D
Support

Slide 14 - Quiz

What is the difference between gravity and weight?

Slide 15 - Question ouverte

Now do the following
26 up to 29 
Answer digitally.

Slide 16 - Diapositive