YR1_T3_LSN4

• 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.

10 min: HW check

• Correct your HW

30 min: recap 3.1 - 3.3

• §3.1
• §3.2
• §3.3

30 min: FICA worksheets

• Practice with FICA
• (Practice with calculating speed)

20 min: study for test

• Review all exercises of     §3.1-§3.3
• Study glossary lists       §3.1-§3.3 on StudyGo

HW CHECK

• Check the answers on classroom
• Correct your own work.
• Use a coloured pen/pencil.

• Stay seated
• Stay quiet

GET READY

• Close your laptop and put it in your bag. 
• Close your textbook 
• Grab a pen/pencil (to make notes)

§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!

§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 force is labeled with the letter "A"?

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

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

1) Does the cyclist move forwards or backwards?
2) What is the resultant force?
(Give answer with unit)

§3.3 SPEED

• I can explain what speed is.
• I can calculate the speed in m/s and in km/h (when you know the distance and time).
• I can calculate the distance when you know the time and the speed.
• I can calculate the time when you know the distance and the speed

§3.3 SPEED

KEY WORDS:

• Motion
• Speed
• km/h
• m/s
• Distance
• Time

What is speed?

Speed is a measure of how fast an object moves. In other words, how far of a distance an object moves in a certain amount of time. 

Speed is measured in: 

meters per second (m/s)

Kilometers per hour (km/h)

Average speed

As an object moves its speed is constantly changing, though this is very difficult to measure.  

Therefore we calculate the average speed, which is the speed over a certain amount of time.

Here a car is constantly changing 

its speed, but we only calculate the 

average speed throughout the journey.

Calculating speed

To calculate speed two things are needed:

• The distance in meters (or kilometers)
• The time in seconds (or hours)

The formula for calculating speed is:

The unit for speed is m/s (or km/h)

How to calculate with a formula?

FICA:

Formula

Information

Calculation

Answer

Example question

Ms de Vreede drives her car to school. 

It takes her 15 minutes and she lives 8 km away. 

• Calculate her speed in m/s.
• Use FICA 

Example question answer

Ms de Vreede drives her car to school. It takes her 15 minutes and she lives 8 km away. (Calculate her speed in m/s)

• F:   speed = distance / time
• I:    8 km and 15 min
• C:  speed = meter / seconds
•       8 km --> meter                      8 x 1000 = 8000 meter
•       15 min --> seconds             15 x 60 = 900 seconds
•       8000m / 900s = 8.89 m/s
• A:  8.89 m/s

Calculating Time and Distance

You can reshape the formula for speed, to calculate time or distance

The formula for calculating speed is:

The unit for speed is m/s (or km/h)

Short break

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

GET READY

• Close your laptop and put it in your bag. 
• Close your textbook 
• Grab a pen/pencil (to make the worksheet)

FICA worksheet

• Make the FICA worksheet 
• Make the questions ALONE

• Do not use your laptop!

Are you stuck?: 

• Ask the person next to you (WHISPERING ONLY!)
• Ask your teacher

Done? Practice with the speed worksheet in classroom!

Homework:

Next week  = quiz §3.1, §3.2 and §3.3:

• Review all exercises of §3.1 - §3.3
• Study glossary list §3.1 - §3.3 on StudyGo

And if you did not do so yet for tomorrow:

• Prepare skills assessment speed: 

       Second section: Graphing