Lesson 3 — force arrows, a force meter, balanced and unbalanced forces

• Forces
• Middelbare school
• havo, vwo
• Leerjaar 1

Science period 1

Forces

Force what comes to mind?

Discuss for 2 minutes with your neighbour what you think this chapter will be about.

Class discussion

• if an object is moving, a force acts on it
• 
  

This lesson

• Recap + Checking the homework 
• Types of forces
• Measuring force
•  Drawing force arrows

https://www.cpp.edu/respect/resources/documents_3rd/forces/gr3.forces_common_student_ideas.pdf

Goals

•  Name at least three types of forces + examples
• Describe how forces are shown in an image
• Name the unit of force
• Describe how a force meter works

Itslearning 

Science period 1

Class Rules

• Your phone goes in the phone hotel
  

•  Every lesson we take a moment to start and end the class

•  When you get a task — put in the effort to work on it

• When you disturb the class you get a warning 

• When you disturb the class even more, you get put out of the class — Consequences will follow

What have we learned about forces already?

Force is a push or pull that change the way an object moves.

• you cannot see forces, only their effect.
  

Forces can change an object in three ways:

•  change the speed of an object.
  
• change the direction of an object's motion.
  
• Change the shape of an objects.
  

Discussing the homework

Types of forces

• Gravitational force
• Electrostatic force
  
• Magnetic force
  
• Friction
  
• Air resistance
  
• Upthrust
  
• Tension
  

Air resistance

Upthrust

Measuring force

Measuring forces

Distance is measured in...

• Meters
  

Time is measured in...

• Seconds
  

Force is measured in...

• Newtons

Force is measured in: 

newtons (N)

Force is measured in: 

newtons (N)

named after Isaac Newton

Force meter

Drawing force arrows

Force arrows show two things:

• Magnitude of the force
• Direction of the force

Simulation

Exercise

• Do the workbook exercises of paragraph 1.1
  
• Read paragraph 1.2

Homework

• The workbook exercises of paragraph 1.1

Goals

•  Name at least three types of forces + examples
• Describe how forces are shown in an image
• Name the unit of force
• Describe how a force meter works