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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This lesson contains 35 slides, with text slides.

time-iconLesson duration is: 45 min

Items in this lesson

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

Slide 1 - Slide

Previous lesson

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Measuring force

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You can also calculate it

  • Fg: Gravitational Force
  • M: Mass
  • g: gravitational field strength
Fg=mg

Slide 4 - Slide

You can also calculate it

  • Fg: Gravitational Force
  • M: Mass
  • g: gravitational field strength
Fg=mg

Slide 5 - Slide

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.

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center of gravity

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Discussing the homework

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Discussing the homework

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Section 2

More than one force

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

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Resultant force

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Resultant force

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Force and extension

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Force and extension

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Force and extension

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Force and extension

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

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

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Section 2

More than one force

Slide 23 - Slide

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

Slide 24 - Slide

Resultant force

Slide 25 - Slide

Resultant force

Slide 26 - Slide

Resultant force

Slide 27 - Slide

Force and extension

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Force and extension

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Force and extension

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Force and extension

Slide 31 - Slide

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

Slide 32 - Slide

Slide 33 - Slide

Slide 34 - Slide

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

Slide 35 - Slide