YR1_T3_LSN1

• Science
• Middelbare school
• havo, vwo
• Leerjaar 1

iubioub

Materials

• Computer (Lessonup)
• Textbook
• Notebook
• Pencil case

I am ready for this lesson:

• I am in the correct seat.
• My jacket is in my locker.
• My telephone is at home or in my locker.
• I have all my materials ready as required by the checklist.
• I do not have any food / drinks and/or chewing gum.

Are we ready?

😒🙁😐🙂😃

iubioub

During this lesson I will .......

• ... be quiet during classroom instructions.
• ... raise my hand when I have a question.
• ... listen when others are speaking.
• ... be an active and involved participant.
• ... only touch/use my own materials.

iubioub

A WARNING

DIFFERENT SEAT  (if possible)

TIME OUT: 5 MIN. MAX CORRIDOR (max 1 at the time)

REMOVAL TO B022

iubioub

PLAN FOR TODAY:

1.

2.

3.

4.

20min: explanation T3.1

• Learning goals
• Key words
• Notes

5min: short break

• Do not move from your seat
• Keep your volume down

30min: explanation T3.2

• Learning goals
• Key words
• Notes
  

35 min: work on homework

• Complete all exercises of §3.1 and §3.2
• Study glossary list §3.1 and §3.2 on StudyGo

TOPIC 3

MOVEMENT IN THE WORLD

§3.1 GRAVITY

LEARNING GOALS:

• I can explain what gravity is.
• I can explain why gravity is essential for life on Earth.
• I can explain the effect of gravity in the universe. 

§3.1 GRAVITY

KEY WORDS:

• gravity
• gravitational force
• atmosphere
• orbit
• tides
• black hole 

What is gravity?

Gravity - a force between two objects due to their mass and size. The objects are pulled towards each other.

What are some examples you can think of?

• Gravity is invisible.
• You can only see its effects.

Earth's gravity

Earth is very large, it has a large gravitational force, 

It interacts with other objects and pulls them towards earth.

This is essential for life on earth:

• We don’t float away. 
• The air we breathe stays in our atmosphere.

Moon's gravity

Though the moon’s gravitational force is only ⅙ as large as earth's it still affects life on earth

• The moon’s gravity pulls on the water in the ocean 
• This pull changes as the earth rotates and makes the tides

Gravity in the universe

Everything that has mass has a gravitational force.

• The sun’s gravitational force holds all the planets in the solar system in orbit
• Gravity creates, stars, planets and black holes too!

What is gravity?

1. Gravity is a force between two objects due to their mass and size.
2. Gravity is a force between two objects due to their mass and speed.
3. Gravity is a force between two objects due to their speed and size.
4. Gravity is a force within two objects due to their mass and size.

True or False:
Tides are cause by the Sun's gravity.

1. True
2. False

True or False:
A black hole is black because it even sucks in all light.

1. True
2. False

Short break

• Do not move from your seat
• Keep your volume down 

§3.2 FORCES

• I can explain that you cannot see a force, but only the effect 
• I know different forces acting on a moving person (gravity, muscle force, air resistance and friction) 
• I can draw forces with arrows
• I can calculate with forces in Newtons.

§3.2 FORCES

KEY WORDS:

• Force
• Gravity
• Muscle force
• Air resistance
• Friction
• Newtons
• Newton meter 

Types of forces

A force is a push or pull. Forces cannot be seen, but their effects can.

Common types of forces:

• Gravity
• Muscle force
• Air resistance
• Friction

What two forces are slowing these cyclists down?

Why does a sled slide easier on ice than on the road?

Why does skating behind someone cost less energy?

Measuring forces

Newton (N) is the unit of a force. 

The more newtons, the stronger the force.

A Newton meter can help you measure 

the force.

Showing forces

We use arrows to show two things about the force:

The direction = the direction the arrow points at

The size = the length of the arrow

What kind of force is the blue arrow?

What kind of force is the red arrow?

What will happen to the box?

Add and substract forces

Two forces in the same direction are ADDED

Two forces in the opposite direction are SUBSTRACTED

Does the cyclist move forwards or backwards? Explain please.

Resultant force

Resultant force:  the sum of all the forces

Same direction = add                            Opposite direction = subtract

Resultant force

                                        180 - 175 = 5N to the left       

                            100 + 80 = 180N                85 + 90 = 175N

Homework:

• Complete all exercises of §3.1 and §3.2
• Study glossary list §3.1 and §3.2 on StudyGo