1-11 Applying forces

Applying forces (p. 39)

Stationary
- Writingbook
- Pen, pencil
- Calculator


Mark
- NO


Lessonup
- YES
Schoolbags in
the cupboard
Phones in the phonebag
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Slide 1: Slide
NatuurkundeMiddelbare schoolvwoLeerjaar 3

This lesson contains 21 slides, with interactive quizzes and text slides.

time-iconLesson duration is: 50 min

Items in this lesson

Applying forces (p. 39)

Stationary
- Writingbook
- Pen, pencil
- Calculator


Mark
- NO


Lessonup
- YES
Schoolbags in
the cupboard
Phones in the phonebag

Slide 1 - Slide

Lesson goals:
  • Explain the difference between a fixed pulley and a loose pulley.
  • Calculate work, force or distance with the work formula.
  • Reason with profit and loss
        of block and tackle

Slide 2 - Slide

Fixed pulley
Changes the direction of the force
(not the magnitude of the force)

Slide 3 - Slide

Slide 4 - Slide

Work formula 


W = work (Nm)
F = force (N)
s = distance (m)
W=Fs

Slide 5 - Slide

too heavy? ... use a block and tackle
count the number of blocks 
above the loose pulley

Slide 6 - Slide

Rule
If an object hangs on N amount of ropes, the hoisting force is 
N x greater and the hoisting distance is N x smaller

Slide 7 - Slide

Profit:
Block and tackle makes the hoisting force 2x bigger
Loss:
2m pulling rope = 
1m hoisting

Slide 8 - Slide

Slide 9 - Slide

What is the hoisting force needed at 3?
1
2
3
4
A
4
B
6
C
8
D
12

Slide 10 - Quiz

49 (p. 37)
timer
2:30

Slide 11 - Slide

Share your answer of exercise 49.
a: ...
b: ...

Slide 12 - Open question

Slide 13 - Slide

50 (p. 37)
timer
2:30

Slide 14 - Slide

Share your answer of exercise 50.
a: ...
b: ...
c: ..
d: ...

Slide 15 - Open question

Slide 16 - Slide

51 (p. 37)
timer
4:00

Slide 17 - Slide

Share your answer of exercise 50.
a: ...
b: ...
c: ..

Slide 18 - Open question

Slide 19 - Slide

What did you
learn today?

Slide 20 - Mind map

Now try
53 and 54 of the digital method

Slide 21 - Slide