# Les 4

Todays lesson
• Types of forces
• Balanced and unbalance forces
• A video
• Working on §1.2
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Slide 1: Tekstslide
Natuurkunde / ScheikundeMiddelbare schoolhavo, vwoLeerjaar 1

In deze les zitten 20 slides, met tekstslides en 1 video.

## Onderdelen in deze les

Todays lesson
• Types of forces
• Balanced and unbalance forces
• A video
• Working on §1.2

#### Slide 1 -Tekstslide

Learning goals
• Give an example for each type of force.
• Calculating resultant force?
• What two things can balanced forces do?
• What two things can unbalanced forces do?

#### Slide 2 -Tekstslide

The homework
Force
Change in speed
Chang in direction
Gravity acting on an apple
Friction acting on a car going a round a corner at a steady speed
Friction when a car brakes in a straight line

#### Slide 3 -Tekstslide

Types of Forces
Gravitational force
Friction
Thrust
Upthrust
Tension
Electrostatic force
Magnetic force

#### Slide 4 -Tekstslide

Thrust
The force applied by an engine

#### Slide 5 -Tekstslide

Thrust
The force of an engine

#### Slide 6 -Tekstslide

We now finished § 1.1

#### Slide 7 -Tekstslide

§1.2 Balanced and unbalanced forces

• Balanced forces
• Unbalanced forces
• Resultant force

#### Slide 8 -Tekstslide

Resultant forces?

Resultant force?

Resultant force?

#### Slide 11 -Tekstslide

Calculating the resultant force
Forces in the same direction add up.
Forces in opposite direction cancel out.

#### Slide 12 -Tekstslide

Video — Exercise

• Acceleration
• Deceleration
• Constant velocity
• Stationary
• Weight
• equal
What do the words below mean?
Discuss in pairs and write down your answer

#### Slide 13 -Tekstslide

Acceleration
Speeding up
Decceleration
Slowing down
Constant velocity
Traveling at one speed
Stationary
Standing still
Weight
The force that pulls you to the earth
Equal
Two things being the same

#### Slide 15 -Video

Homework
The Workbook exercises of §1.2

#### Slide 16 -Tekstslide

Learning goals
• Give an example for each type of force.
• Calculating resultant force?
• What two things can balanced forces do?
• What two things can unbalanced forces do?

#### Slide 18 -Tekstslide

Balanced and unbalance forces
Balanced forces
• Object remains stationary
• Object keeps moving at a constant velocity
Unbalanced Forces
• Accelerate
• Decelerate

#### Slide 19 -Tekstslide

Homework
The Workbook exercises of §1.2