# Lesson 5

Chapter 2 — Forces
Section 2 more than one force
This lesson:

• Recap
• Section 2
• Homework
1 / 22
Slide 1: Slide
PhysicsMiddelbare schoolvwoLeerjaar 3

This lesson contains 22 slides, with text slides.

Lesson duration is: 45 min

## Items in this lesson

Chapter 2 — Forces
Section 2 more than one force
This lesson:

• Recap
• Section 2
• Homework

#### Slide 1 -Slide

What is force?
•  Force can accelerate objects
• Change the direction of a moment
• Change the shape of an object (plastic and elastic deformation)

#### Slide 2 -Slide

What is a vector?

#### Slide 3 -Slide

What is a vector?
A force vector always has three things:
• A magnitude
• A direction
• A point of exertion

#### Slide 7 -Slide

center of gravity

#### Slide 8 -Slide

You can also calculate it

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

#### Slide 9 -Slide

Practice exercise
A cat ended up on a planet, but we're not sure which one. Astronauts know that the cats mass is 6,3 kg. Their weight on this planet is 88,641 N.

Which planet did the cat end up on?

Use the table to the right to find the answer.

#### Slide 10 -Slide

Section 2 – More than one force

Resultant force

Resultant force

Resultant force

#### Slide 14 -Slide

Use the parallelogram method do do exercise 8

#### 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
Section 2:
Exercise 5, 6, 7, 8 and 9