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Topic 3.1 : Forces
Topic 3.1 :
Forces
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
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Tekstslide
Science
Middelbare school
havo
Leerjaar 2
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Topic 3.1 :
Forces
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
Slide 1 - Tekstslide
Topic 3.1 :
Forces
Forces are all around us, You can’t see them !
You can only see their effect
Object changes shape
Object starts to move
Object changes speed
Direction of object changes
Slide 2 - Tekstslide
Topic 3.1 :
Forces
Object
changes shape
Slide 3 - Tekstslide
Topic 3.1 :
Forces
Object
starts to move
Slide 4 - Tekstslide
Topic 3.1 :
Forces
Object
changes speed
Slide 5 - Tekstslide
Topic 3.1 :
Forces
Object
changes direction
Slide 6 - Tekstslide
Topic 3.1: Forces
There are many types of forces
Types of forces
Unit
Also known as
Gravity
F
g
Applied force
F
a
muscle force
Air resistance
F
air
drag
Friction
F
f
Tension force
F
t
Spring force
F
s
elastic force
Normal force
F
n
support force
Topic 3.1:
Forces
Slide 7 - Tekstslide
Air resistance force
Gravity force
Spring force
magnetic force
Normal Force
Tension Force
applied force
Friction force
Slide 8 - Sleepvraag
Topic 3.1:
Forces
Force (F)
Measured in Newtons (N)
The force needed to lift 1 kg = 9.8 N on earth
On the moon the force needed is only 1.6 N
The mass is the same
Gravitational force is different
Slide 9 - Tekstslide
Topic 3.1:
Forces
Formula for calculating Gravity force
F
g
is the gravitational force in [
N]
m is the mass in [
kg
]
9.8 is the gravitational constant on earth in
N / kg
or
F
g
= m x 9.8
m / s
2
Slide 10 - Tekstslide
Topic 3.1: Forces
Example:
The mass of Peter is 76 kg. What is his gravitational force, F
g
?
F
g
= m x 9.8
F
g
=
76
[kg] x
9.8
[N/kg]
F
g
=
744.8
[N]
Slide 11 - Tekstslide
The mass of Mohamed is 45 kg. What is his gravitational force, Fg
A
350 N
B
45 N
C
441 N
D
882 N
Slide 12 - Quizvraag
The gravitational force of my cat is 34.3N What is her mass?
A
34,3 kg
B
3,5 kg
C
336 kg
D
24,5 kg
Slide 13 - Quizvraag
Topic 3.1 :
Forces
Forces are represented by an arrow
It has three things:
1. point of application (origin of force)
2. direction
3. magnitude (the longer the arrow, the bigger the force)
Slide 14 - Tekstslide
Topic 3.1:
Forces
1. point of origin:
Centre of mass
2. Direction:
downward
3. Magnitude:
depending on scale
Slide 15 - Tekstslide
Name types of forces
Slide 16 - Woordweb
A forces is drawn with a length of 4 cm
The scale is 1 cm = 30 N
What is the magnitude of the force drawn?
A
60 N
B
30 N
C
120 N
D
7,5 N
Slide 17 - Quizvraag
I want to draw a force with a magnitude of 300 N.
The scale must be 1 cm = 60 N
How large should the arrow (vector) be?
A
2 cm
B
5 cm
C
10 cm
D
12 cm
Slide 18 - Quizvraag
Topic 3.1:
Forces
Adding up forces (resultant force)
Two forces in the same direction are added up
Two forces in opposite direction are subtracted from eachother
If forces are equal and in opposite direction, there is no motion!
Slide 19 - Tekstslide
What is the resultant force?
A
140 N to the left
B
140 N to the right
C
60 N to the left
D
60 N to the right
Slide 20 - Quizvraag
What is the resultant force?
A
225 N to the left
B
225 N to the right
C
25 N to the left
D
25 N to the right
Slide 21 - Quizvraag
Topic 3.1:
Forces
Adding up forces that are not in one line
Head-tail method
begin to end = resultant force
Slide 22 - Tekstslide
Forces can't be seen.
What effects of a force can be seen?
A
changes in shape
B
changes in temperature
C
changes is color
D
changes in density
Slide 23 - Quizvraag
A person on earth has a mass of 80 kg. What is the gravitational force?
Only give your answer and unit
Slide 24 - Open vraag
Topic 3.1 : Forces
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
Slide 25 - Tekstslide
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