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1-1 Introduction and forces
Introduction and forces
(p. 8)
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Slide 1:
Tekstslide
Natuurkunde
Middelbare school
vwo
Leerjaar 3
In deze les zitten
16 slides
, met
interactieve quizzen
en
tekstslides
.
Lesduur is:
50 min
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Introduction and forces
(p. 8)
Stationary
- Book and writingbook
- Pen, pencil
- Calculator
- iPad
REPORT
- NO
Lessonup
- YES
Schoolbag
in
the cupboard
Phones
in the phonebag
Slide 1 - Tekstslide
Forces can do three things:
Change the speed of an object
Change the direction of an object
Change the
shape of an
object
Slide 2 - Tekstslide
Types of forces:
Muscular strength
Resistance or resilience
Tention (rope)
Gravity
Magnetic force
Friction
or
Forces are measured with a
dynamometer
in Newton.
F
m
u
s
c
F
r
F
T
F
g
r
F
f
f
Slide 3 - Tekstslide
Calculating gravitational force:
To calculate the gravitational force on an object we use the formula...
F = mg
where g = 9.8 N/kg
Slide 4 - Tekstslide
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
F
g
r
Slide 5 - Tekstslide
Example 1
What is the gravitational force of an object with a mass of
550 grams?
Slide 6 - Tekstslide
Example 2
If the gravity on an object is 900 N, what then is the mass of the object?
Slide 7 - Tekstslide
Which of the following is NOT an effect of forces:
A
Increase speed
B
Change direction
C
Change shape
D
Attract an object
Slide 8 - Quizvraag
Which of the following is NOT a type of force?
A
Muscular strength
B
Mass force
C
Magnetic force
D
Resilience
Slide 9 - Quizvraag
What can be used to measure forces?
A
Ruler
B
Dynamometer
C
Newton scale
D
An estimation
Slide 10 - Quizvraag
What must be the unit of mass if you want to calculate force?
A
ton
B
kg
C
g
D
mg
Slide 11 - Quizvraag
When do you divide with 9,8 and when do you multiply with 9,8?
Slide 12 - Open vraag
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 13 - Quizvraag
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 14 - Quizvraag
What did you
learn today?
Slide 15 - Woordweb
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
.
F
=
m
a
Slide 16 - Tekstslide
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