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4-4 Magnitude of forces (5.2)
The magnitude of forces (p. 164)
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Natuurkunde
Middelbare school
havo, vwo
Leerjaar 2
This lesson contains
21 slides
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interactive quizzes
and
text slides
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Lesson duration is:
50 min
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Items in this lesson
The magnitude of forces (p. 164)
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Stationary
- Textbook and writingbook
- pen and pencil
Mark
- NO
Slide 1 - Slide
Kilogram and newton
- Kilogram is the amount of matter
- Fore is measured in newton, the symbol for newton is N
On earth a force of 9,8 N is required to lift one kilogram of substance.
Slide 2 - Slide
Force to pick something up
1 kg - force needed is 9,8 N
10 kg - force needed is 98 N
F = force in newton
m = mass in kilogram
g = gavitational acceleration in m/s
2
F
=
m
⋅
g
Slide 3 - Slide
Strongest muscles
Muscles consist of muschle tissue
By training your muscles the
your muscles grow and strengthen
The strongest muscles are at the
front of yout thighs.
They can deliver a force of
1 000 N.
Slide 4 - Slide
Actvity 5 (p 170)
During the next lesson
(1 test)
- You are going to hang masses on a
spring.
- you will measure the
extention of the spring
After that you will make a graph with the extention (in cm) plotted against the force.
Slide 5 - Slide
Measuring forces
- A spring balance is made up of a spring mounted in a cylinder.
- On the cylinder there is a scale division.
Slide 6 - Slide
Symbols of forces
Slide 7 - Slide
Which unit is used to measure mass?
A
kg
B
N
C
m
D
m/s
Slide 8 - Quiz
Which unit is used to measure force?
A
kg
B
N
C
m
D
m/s
Slide 9 - Quiz
The object with the largest mass experiences the greatest gravitational force.
A
true
B
false
Slide 10 - Quiz
What is the gravitational force on a watermelon that has a mass of 2 300 gram?
A
22 540N
B
23 N
C
235 N
D
0,2 N
Slide 11 - Quiz
What is the mass of a horse if the gravitational force on the horse is
7 350 N?
A
72 030 kg
B
750 kg
C
700 kg
D
1 000 kg
Slide 12 - Quiz
What is the symbol for frictional force?
A
Fw,l
B
Fz
C
Ff
D
Fv
Slide 13 - Quiz
timer
5:00
The following questions are bout the practical investigation you will do the next lesson. Take 5 minutes to read (p 170)
Slide 14 - Slide
What is placed on the vertical axis?
A
Mass
B
Gravitational force
C
Length of spring
D
Extension of spring
Slide 15 - Quiz
What is placed on the horizontal axis?
A
Mass
B
Gravitational force
C
Length of spring
D
Extension of spring
Slide 16 - Quiz
Now do 24 up to 28
(p 165)
No discussion
10 minutes
when you are done - read p. 166 and 167
timer
10:00
Slide 17 - Slide
Slide 18 - Slide
What have
you learned?
Slide 19 - Mind map
Conclution:
Mass we measure in kilograms (kg)
Force is measured with
The symbols for different forces are
F
=
m
⋅
a
Slide 20 - Slide
Slide 21 - Slide
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