This lesson contains 31 slides, with interactive quizzes and text slides.
Lesson duration is: 50 min
Items in this lesson
Introduction and forces
(p. 8)
Bluetooth
- ON
- VPN off
Stationary
- Book and writingbook
- Pen, pencil
- Calculator
- iPad
REPORT
- NO
Lessonup
- YES
Schoolbag in
the cupboard
Phones in the phonebag
Slide 1 - Slide
LESSONUP:
- Download the lessonup app from the appstore.
- Register, and type in the following classcode:
A3X - qxbwq
C3X - jncws
Slide 2 - Slide
Google classroom
A3X - v8bnxk
C3X - f347gg2
Slide 3 - Slide
Lessongoals:
Discussion of the class rules.
Name three things forces can do.
Name the two types of deformation.
Explain which deformation is applicable.
Name the types of forces.
Calculate gravitational force.
Slide 4 - Slide
Rules
We respect each other
We keep the class clean
- We dont eat in the class
- You may have a bottle of water with you
We do our best
- Be prepared for a lesson
- Give your best effort
Slide 5 - Slide
What do you need in every lesson:
For all the lessons bring an A4 writing book with 1 x 1 blocks and a textbook even when you are writing a test.
Keep a file for your tests and handouts (alternatively you can take a photo of the mark of your test).
Slide 6 - Slide
CALCULATOR, a Casio!! You are not allowed to use your mobile phone or iPad as calculator because you must learn how to use your calculator in the class.
Stationary such as a pen, pencil and ruler/ geotriangle.
Sometimes you need a pair of compasses to draw a circle, so also have that with you.
Slide 7 - Slide
Neatness
Begin a new lesson with a heading and a date in your writing book and underline your work at the end of a lesson.
Write with a black or blue pen, and make diagrams and graphs with a pencil.
You will get a mark for your writing book.
Slide 8 - Slide
Forces can do three things:
Change the speed of an object
Change the direction of an object
Change the
shape of an
object
Slide 9 - Slide
There are two kinds of deformation
Elastic deformation:
Original shape of an object
returns when force is removed.
Plastic deformation:
The deformation is permanent.
Slide 10 - Slide
Types of forces:
Muscular strength
Resistance or resilience
Tention (rope)
Gravity
Magnetic force
Friction
or
Forces are measured with a dynamometer in Newton.
Fmusc
Fr
FT
Fgr
Ff
f
Slide 11 - Slide
Calculating gravitational force:
To calculate the gravitational force on an object we use the formula...
F = mg
where g = 9.8 N/kg
Slide 12 - Slide
Calculating gravity
If you have the mass of an object in kg,
then you can calculate the force of gravity with:
mass x 9.8
Fgr
Slide 13 - Slide
Example 1
What is the gravitational force of an object with a mass of
550 grams?
Slide 14 - Slide
Example 2
If the gravity on an object is 900 N, what then is the mass of the object?
Slide 15 - Slide
What kind of deformation can be seen here
A
Elastic deformation
B
Plastic deformation
Slide 16 - Quiz
What kind of deformation can be seen here?
A
Elastic deformation
B
Plastic deformation
Slide 17 - Quiz
What kind of deformation can be seen here?
A
Elastic deformation
B
Plastic deformation
Slide 18 - Quiz
Which of the following is NOT an effect of forces:
A
Increase speed
B
Change direction
C
Change shape
D
Attract an object
Slide 19 - Quiz
Which of the following is NOT a type of force?
A
Muscular strength
B
Mass force
C
Magnetic force
D
Resilience
Slide 20 - Quiz
What can be used to measure forces?
A
Ruler
B
Dynamometer
C
Newton scale
D
An estimation
Slide 21 - Quiz
What must be the unit of mass if you want to calculate force?
A
ton
B
kg
C
g
D
mg
Slide 22 - Quiz
When do you divide with 9,8 and when do you multiply with 9,8?
Slide 23 - Open question
What is the gravitational force on a tennis ball with a mass of 56 grams?
A
548,8 N
B
5,7 N
C
0,549N
D
0,57N
Slide 24 - Quiz
What is the mass of an antelope with a gravitational force of 2 499 N?
A
255 kg
B
2,55 kg
C
24 490 kg
D
24,49 kg
Slide 25 - Quiz
Do question 3 (p. 12)
timer
2:00
Slide 26 - Slide
Slide 27 - Slide
Do question 5 (p. 12)
timer
3:00
Slide 28 - Slide
Slide 29 - Slide
What did you learn today?
Slide 30 - Mind map
Conclusion:
Forces can change the speed, direcition
and shape of an object.
With elastic deformation the object returns to its original shape and with plastic deformation the deformation is permanent.
Types of forces: Muscular strength, resilience, gravitational force and magnetic force.