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

• Natuurkunde
• Middelbare school
• havo, vwo
• Leerjaar 2

Calculations with mass

and gravitational force

(p 166)

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Lessonup

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Stationary

- Book and writingbook

- Pen, pencil

- Ruler and calculator

Mark

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Lesson goals:

- Calculating a force

- Drawing forces

- Determine a resultant force

Calculating gravittional force

mass (in kg) multiplying with 9,8

SO...

F​g​​=m⋅9,8

What is the gravitational force on an object with a mass of 3 400 grams?

1. 33 320 N
2. 33 N
3. 347 N
4. 0,3 N

What is the mass of an object
that experiences a
gravitational force of 23 N?

1. 2,3 kg
2. 23 kg
3. 225 kg

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)

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

Now it is your turn:

Draw a downwards force of 30 N

Paste a foto of your answer

Adding and subtracting forces:

• Forces in the same direction are added together
  
• Forces in opposite directions are subtracted from each other
  

Example from the textbook:

What is the resultant force?

1. 290 N to the right
2. 290 N to the left
3. 50 N to the right
4. 50 N to the left

What is the resultant force?

1. 490 N to the right
2. 490 N to the left
3. 150 N to the right
4. 150 N to the left

Now do questions 

29 - 36 (p 167)

No discussion

You will type your answers into lessonup.

When you are done, search for youtube videos on the topic of forces

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

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

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

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

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

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

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

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

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

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

Conclusion:

- Calculating forces

- Drawing forces

- Calculate the reslutant force