4-5 Calculations with mass and gravitational force (4.2)

Calculations with mass
and gravitational force
(p 166)
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Slide 1: Diapositive
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Calculations with mass
and gravitational force
(p 166)
Bluetooth 
- ON
Lessonup
- YES
Stationary
- Book and writingbook
- Pen, pencil
- Ruler and calculator
Mark
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Slide 1 - Diapositive

Lesson goals:
- Calculating a force
- Drawing forces
- Determine a resultant force

Slide 2 - Diapositive

Calculating gravittional force
mass (in kg) multiplying with 9,8



SO...
Fg=m9,8

Slide 3 - Diapositive

What is the gravitational force on an object with a mass of 3 400 grams?
A
33 320 N
B
33 N
C
347 N
D
0,3 N

Slide 4 - Quiz

What is the mass of an object
that experiences a
gravitational force of 23 N?
A
2,3 kg
B
23 kg
C
225 kg

Slide 5 - Quiz

Forces and arrows
Important - When you draw a force with an arrow...
  • You need a point of action
  • Direction
  • Length (the greater the force
       the longer the arrow)

Slide 6 - Diapositive

The steps...
  1. Choose a suitable scale
  2. Do your calculations
  3. TDraw your force with the correct point of action
Example: Draw a force to the right with a magnitude of 24 N...
Step 1:            4N = 1 cm
Step 2:        24 N = 6 cm

Slide 7 - Diapositive

Now it is your turn:
Draw a downwards force of 30 N

Slide 8 - Diapositive

Paste a foto of your answer

Slide 9 - Question ouverte

Adding and subtracting forces:
  • Forces in the same direction are added together
  • Forces in opposite directions are subtracted from each other

Slide 10 - Diapositive

Example from the textbook:

Slide 11 - Diapositive

What is the resultant force?
A
290 N to the right
B
290 N to the left
C
50 N to the right
D
50 N to the left

Slide 12 - Quiz

What is the resultant force?
A
490 N to the right
B
490 N to the left
C
150 N to the right
D
150 N to the left

Slide 13 - Quiz

Now do questions 
29 - 36 (p 167)

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You will type your answers into lessonup.

When you are done, search for youtube videos on the topic of forces
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Slide 14 - Diapositive

Answer 29a
Use a , not a .
don't add a space in front of the unit

Slide 15 - Question ouverte

Answer of 29b
Use a , not a .
don't add a space in front of the unit

Slide 16 - Question ouverte

Answer of 29c
Use a , not a .
don't add a space in front of the unit

Slide 17 - Question ouverte

Answer of 29d
2 decimalen, Use a , not a .
don't add a space in front of the unit

Slide 18 - Question ouverte

Answer of 31
Use a , not a .
don't add a space in front of the unit

Slide 19 - Question ouverte

Answer of 32a
Use a , not a .
don't add a space in front of the unit

Slide 20 - Question ouverte

Answer of 32b
Use a , not a .
don't add a space in front of the unit

Slide 21 - Question ouverte

Answer of 32c
2 decimals, Use a , not a .
don't add a space in front of the unit

Slide 22 - Question ouverte

33c
one decimal, Use a , not a .
don't add a space in front of the unit

Slide 23 - Question ouverte

36d
Use a , not a .
don't add a space in front of the unit

Slide 24 - Question ouverte

Conclusion:
- Calculating forces
- Drawing forces
- Calculate the reslutant force

Slide 25 - Diapositive

Slide 26 - Diapositive

Slide 27 - Diapositive

Slide 28 - Diapositive

Slide 29 - Diapositive