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Y2_T4_LSN4.1
Topic 4
MOVEMENT IN THE WORLD
GRADES:
QUIZ (2X)
TEST (4X)
1 / 17
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Slide 1:
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Science
Middelbare school
havo, vwo
Leerjaar 2
This lesson contains
17 slides
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interactive quizzes
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text slides
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Lesson duration is:
90 min
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Topic 4
MOVEMENT IN THE WORLD
GRADES:
QUIZ (2X)
TEST (4X)
Slide 1 - Slide
§4.1 Forces
p. 154-157
ex 1-11 p 158-161
Check out plan in magister!
Slide 2 - Slide
§4.1 - Learning Goals:
I can explain what a force is and can identify different types of forces.
I can calculate the gravitational force acting on an object.
I can draw arrows on a force diagram with the correct point of application, magnitude and direction.
I can calculate the resultant force of forces going in the same direction or opposite directions of each other.
VWO ONLY - I can calculate the resultant force of two perpendicular forces
P.154-157
Slide 3 - Slide
§4.1 - Keywords:
Gravity
Applied force
Air resistance
Friction
Tension force
Spring force
Normal force
Resultant force
Point of application
Direction
Magnitude
P.154-157
F
g
F
a
F
a
i
r
F
f
F
t
F
s
F
n
F
r
e
s
Slide 4 - Slide
A world of Forces:
Forces are all around us
You can’t see them
You can only see their effect
The things forces can do:
Object changes shape
Object starts to move
Object changes speed
Direction of object changes
P.154-157
Slide 5 - Slide
Types of Forces:
Gravity
Applied force
Air resistance
Friction
Tension force
Spring force
Normal force
P.154-157
F
g
F
a
F
a
i
r
F
f
F
t
F
s
F
n
Slide 6 - Slide
Slide 7 - Slide
Magnitude of Forces:
Force is measured in Newtons
The force needed to lift 1 kg = 9.81 N on earth
On the moon the force needed is only 1.6 N
The mass is the same
Gravitational force is different
P.154-157
Slide 8 - Slide
Calculation gravitational force:
= gravitational force in Newton or weight
m = mass in kg
9.81 is a constant
P.154-157
F
g
F
g
=
m
⋅
9
.
8
1
Slide 9 - Slide
Example: Peter has a mass of 76 kg. What is his gravitational force, ?
F
g
Slide 10 - Open question
Example: The gravitational force of my cat is 34.3N What is her mass?
F
g
Slide 11 - Open question
Drawing Forces:
Forces are represented by an
arrow
It has three things:
point of application -
origin of force
direction
magnitude (size) -
the longer the arrow, the bigger
the force
P.154-157
Slide 12 - Slide
Adding & subtracting forces:
Two forces in the same direction are added up
Two forces in opposite direction are subtracted from each other
If forces are equal, there is no motion
P.154-157
Slide 13 - Slide
Adding & subtracting forces:
Resultant force is the sum of the forces
It is written as
Forces in the same direction = add
Forces in the opposite direction = subtract
P.154-157
F
r
e
s
Slide 14 - Slide
Perpendicular forces:
Combine the forces end to end by making a triangle
P.154-157
Slide 15 - Slide
Forces worksheet:
Open the worksheet on Google Classroom
Try the questions by yourself first.
Then try together
Then ask for help
P.154-157
Slide 16 - Slide
Hw for lesson 2:
Complete the forces worksheet.
Complete exercises 1-11 of §4.1 pages 158-161
Read §4.2 pages 162-165
Study the glossaries of §4.1-§4.2 on Studygo.
P.154-157
Slide 17 - Slide
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