Lesson 4 — Balanced and unbalanced forces

• Force
• 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

Checking homework

Balanced and unbalanced forces

Resultant force

Worksheet

Goals

• Describe the effects of balanced forces on stationary and moving objects

• Describe the effects of balanced forces on stationary and moving objects
  

•  Be able to calculate resultant force

Checking the homework

• Use the answer sheet to check your answers
  

• Any questions?

Open the answers on another tab, and let the students check their answers them selves

Balanced forces

and

 

unbalanced forces

Simulation

Balanced or unbalanced?

Balanced or unbalanced?

Balanced and unbalanced forces

•  A pair of forces

• Working in opposite directions

• Or working in the same direction

Resultant force

•  Forces in the same direction add up
• Forces in opposite directions cancel out

Simulation

Resultant force?

	balanced forces	Unbalanced forces
stationary objects
Moving objects

	balanced forces	Unbalanced forces
stationary objects	remain stationary
Moving objects

	balanced forces	Unbalanced forces
stationary objects	remain stationary	gets forced into moving
Moving objects

	balanced forces	Unbalanced forces
stationary objects	remain stationary	gets forced into moving
Moving objects	Move at a steady speed

	balanced forces	Unbalanced forces
stationary objects	remain stationary	gets forced into moving
Moving objects	Move at a steady speed	They accelerate/ decelerate

Worksheet balanced and unbalanced forces

If you're done, start working on the workbook exercises of paragraph 1.2

Goals

• Describe the effects of balanced forces on stationary and moving objects

• Describe the effects of balanced forces on stationary and moving objects
  

•  Be able to calculate resultant force