# 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
Slide 1: Tekstslide
NatuurkundeMiddelbare schoolvwoLeerjaar 3

In deze les zitten 16 slides, met interactieve quizzen en tekstslides.

Lesduur is: 50 min

## Onderdelen in deze les

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 -Tekstslide

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

#### Slide 2 -Tekstslide

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 -Tekstslide

Why does a planet not move away from the sun?

Because a planet is
attracted to the sun.

#### Slide 4 -Tekstslide

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 -Tekstslide

Elliptical orbits
Almost circular.

#### Slide 6 -Tekstslide

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 -Tekstslide

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 9 -Tekstslide

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

#### Slide 10 -Tekstslide

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 -Tekstslide

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

#### Slide 12 -Open vraag

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

#### Slide 13 -Quizvraag

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

#### Slide 14 -Quizvraag

What is the difference between gravity and weight?

#### Slide 15 -Open vraag

Now do the following
26 up to 29
Answer digitally.