1-2 Drawing forces and a centre of gravity

Drawing forces and a 
centre of gravity (p. 9)
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Slide 1: Diapositive
NatuurkundeMiddelbare schoolvwoLeerjaar 3

Cette leçon contient 20 diapositives, avec quiz interactifs et diapositives de texte.

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Drawing forces and a 
centre of gravity (p. 9)
Bluetooth 
- ON
- VPN off

Stationary
- Text book and writing book
- Pen, pencil
- Calculator
- iPad Geotriangle
Mark
- NO


Lessonup
- YES
Schoolbags in
the cupboard
Phones in the phonebag

Slide 1 - Diapositive

Lessongoals:
  • Draw or sketch a force diagram.
  • Indicate where the centre of gravity lies.

Slide 2 - Diapositive

Drawing a force
A force has a
- magnitude
- direction
- point of application
Any quality with these properties is called a vector.

Slide 3 - Diapositive

Force scale
First choose a force scale, eg. 1 cm      5 N

- This means that an arrow with a length of 1 cm represents a force of 5 N and therefore an arrow with a length of 3 cm represents a force of 15 N.

Slide 4 - Diapositive

Example
Draw a force of 20N to the right.

Slide 5 - Diapositive

Centre of gravity
Point where you can imagine gravity as being applied.

An object will topple over if the centre of
gravity is not above the plane it is resting 
on.
Plane it is resting on

Slide 6 - Diapositive

Slide 7 - Diapositive

Which one of the following factors is insignificant when drawing a force?
A
Length
B
Thickness
C
Point of application
D
Direction

Slide 8 - Quiz

Where is the centre of gravity?
A
B
C
A
A
B
B
C
C

Slide 9 - Quiz

Do question 7 (p. 12)
On the following slide you will hand in a photo of your answer
timer
3:00

Slide 10 - Diapositive

Make a photo of your answer to question 5 and hand it in.

Slide 11 - Question ouverte

Slide 12 - Diapositive

Do question 8 (p. 13)
timer
3:00

Slide 13 - Diapositive

Slide 14 - Diapositive

Do question 10 (p. 13)
timer
1:00

Slide 15 - Diapositive

Slide 16 - Diapositive

Do question 12 (p. 13)
timer
3:00

Slide 17 - Diapositive

Slide 18 - Diapositive

What have you
learned today?


Slide 19 - Carte mentale

Conclusion:
  • A vector has magnitude, direction and a point of application.
  • An arrow representing a force therefore has a length, direction and a starting point.
  • The centre of gravity is the point 
       where the mass of the object is in 
       equilibrium.

Slide 20 - Diapositive