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Lesson 3

Chapter 2 — Forces
Section 2 more than one force
This lesson:
  • Previous lesson
  • Discussing the homework
  • Section 2
  • Working on exercises
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Chapter 2 — Forces
Section 2 more than one force
This lesson:
  • Previous lesson
  • Discussing the homework
  • Section 2
  • Working on exercises

Slide 1 - Diapositive

Previous lesson

Slide 2 - Diapositive

Measuring force

Slide 3 - Diapositive

You can also calculate it

  • Fg: Gravitational Force
  • M: Mass
  • g: gravitational field strength
F​g​​=m⋅g

Slide 4 - Diapositive

You can also calculate it

  • Fg: Gravitational Force
  • M: Mass
  • g: gravitational field strength
F​g​​=m⋅g

Slide 5 - Diapositive

Drawing forces — Vectors
Forces has:
  • A magnitude
  • A direction
  • A point of exertion

When you draw forces you first decide a force scale. 
For example: 1 cm ≡ 5 N.

Slide 6 - Diapositive

Slide 7 - Diapositive

center of gravity

Slide 8 - Diapositive

Discussing the homework

Slide 9 - Diapositive

Discussing the homework

Slide 10 - Diapositive

Section 2

More than one force

Slide 11 - Diapositive

Forces accelerate
  • In that case we're talking about net force.
  • What is Net force?

Slide 12 - Diapositive

Resultant force

Slide 13 - Diapositive

Resultant force

Slide 14 - Diapositive

Force and extension

Slide 15 - Diapositive

Force and extension
Link

Slide 16 - Diapositive

Force and extension
Link

Slide 17 - Diapositive

Force and extension
Link

Slide 18 - Diapositive

Force and extension
C=​x​​F​​
C: Spring constant (in N/m)
F: Force (in N)
x: Extension (in m)

Slide 19 - Diapositive

Slide 20 - Diapositive

Slide 21 - Diapositive

Homework
Read: Chapter 2, Section 2
Do: Exercise 3, 4, 5 and 6

Slide 22 - Diapositive

Section 2

More than one force

Slide 23 - Diapositive

Forces accelerate
  • In that case we're talking about net force.
  • What is Net force?

Slide 24 - Diapositive

Resultant force

Slide 25 - Diapositive

Resultant force

Slide 26 - Diapositive

Resultant force

Slide 27 - Diapositive

Force and extension

Slide 28 - Diapositive

Force and extension
Link

Slide 29 - Diapositive

Force and extension
Link

Slide 30 - Diapositive

Force and extension
Link

Slide 31 - Diapositive

Force and extension
C=​x​​F​​
C: Spring constant (in N/m)
F: Force (in N)
x: Extension (in m)

Slide 32 - Diapositive

Slide 33 - Diapositive

Slide 34 - Diapositive

Homework
Read: Chapter 2, Section 2
Do: Exercise 3, 4, 5 and 6

Slide 35 - Diapositive

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