# 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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Slide 1: Slide
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This lesson contains 35 slides, with text slides.

Lesson 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

Previous lesson

Measuring force

#### Slide 3 -Slide

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.

#### Slide 7 -Slide

center of gravity

#### Slide 8 -Slide

Discussing the homework

#### Slide 9 -Slide

Discussing the homework

#### Slide 10 -Slide

Section 2

More than one force

#### Slide 11 -Slide

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

Resultant force

Resultant force

#### Slide 14 -Slide

Force and extension

#### Slide 15 -Slide

Force and extension

#### Slide 16 -Slide

Force and extension

#### Slide 17 -Slide

Force and extension

#### Slide 18 -Slide

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

#### Slide 21 -Slide

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

#### Slide 22 -Slide

Section 2

More than one force

#### Slide 23 -Slide

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

Resultant force

Resultant force

Resultant force

#### Slide 27 -Slide

Force and extension

#### Slide 28 -Slide

Force and extension

#### Slide 29 -Slide

Force and extension

#### Slide 30 -Slide

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 34 -Slide

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