4-4 Magnitude of forces (5.2)

The magnitude of forces (p. 164)
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NatuurkundeMiddelbare schoolhavo, vwoLeerjaar 2

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

time-iconLesson duration is: 50 min

Items in this lesson

The magnitude of forces (p. 164)
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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/s2
F=mg

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=ma

Slide 20 - Slide

Slide 21 - Slide