4-7 magnitude of forces (4.2 knowing more)

The magnitude of
a force (p 169)
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- Pen and calculator

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Slide 1: Tekstslide
NatuurkundeMiddelbare schoolhavo, vwoLeerjaar 2

In deze les zitten 19 slides, met interactieve quizzen, tekstslides en 4 videos.

time-iconLesduur is: 50 min

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The magnitude of
a force (p 169)
Bluetooth 
- ON

Lessonup
- YES
Stationary
- Books
- Pen and calculator

Mark
- No


Slide 1 - Tekstslide

Lesson goals:
  • What does 'elastic' mean
  • What does 'stiff' mean
  • Make calculations if the  
       tensile strength of a material 
       is known

Slide 2 - Tekstslide

Slide 3 - Video

Slide 4 - Video

Slide 5 - Video

Streaching and bending
Everything can stretch.
A rubber band is elastic
because it returns to its 
original length.
But even steel wire and a thick 
steel cable streaches a little bit.

Slide 6 - Tekstslide

Stiff
  • Steel is stiffer than rubber. 
  • Therefore you need a greater 
       pulling force to stretch steel. 
  • Thickness and shape also influence the size of the required pulling force. 
  • Huge buildings move a bit in the wind.

Slide 7 - Tekstslide

Slide 8 - Video

Bend or break
A weak material can break 
due to tensile or bending forces. 
E.g. a bridge breaks if the traffic 
that crosses it is too heavy.


Slide 9 - Tekstslide

                     Tensile strength
                                          The tensile strength of steel is 400 N/mm2
This means that a steel cable with a cross-sectional area of 
 1 mm2 breaks under a load of 400 N.
Paper has a tensile strength of approximatly 100 N/mm2.
Designers have to take these strengths into consideration.

Slide 10 - Tekstslide

Make 37 up to 40 
(p 169)

no discussion

Answers will be typed into your iPad

When you are done, read mroe about 'largest engineering disasters'
timer
8:00

Slide 11 - Tekstslide

37a
A
handle
B
strings
C
frame

Slide 12 - Quizvraag

37b
A
handle
B
stings
C
frame

Slide 13 - Quizvraag

38a
A
bowstring
B
bow

Slide 14 - Quizvraag

39a
A
27
B
9
C
81
D
3

Slide 15 - Quizvraag

40a
A
3N
B
30N
C
29,4N
D
3kg

Slide 16 - Quizvraag

40b
A
29,4
B
294
C
2,94
D
0,29

Slide 17 - Quizvraag

40c
A
1176
B
136
C
0,0074
D
2,94

Slide 18 - Quizvraag

What did you
learn today?

Slide 19 - Woordweb