Lesson 3 — 1.2 Balanced forces

• Natuurkunde / Scheikunde
• Middelbare school
• havo
• Leerjaar 1

Lessonplan

Lesson plan

Opening — 5 min

- Lesson plan

- Goals

- Tug of war — which side applied more force? what effect did that have?

Class phase — 15

- Balanced and unbalanced forces

• Examples — force the students to come up with examples

• Effects — let the students fill in the table of balanced and unbalanced with stationary and moving.

Solo phase — 20 min

- Fill in the table

- Start the homework

Closing — 10 min

- discuss the table

- What have you learned + goals

- Next lesson – homework

Learning goals

• Explain the difference between balanced and unbalanced forces

• Describe the effect of balanced forces

• Describe the effect of unbalanced forces

This lesson

• Balanced and unbalanced forces
• Resultant force

https://www.youtube.com/watch?v=n2gQs1mcZHA&ab_channel=Don%27tMemorise

Learning goals

• Recognise balanced and unbalanced forces.
• Name two things balanced forces can do.
• Name two things unbalanced forces can do.
• Calculate resultant force.

Balanced and unbalanced

forces

• Balanced forces
• Unbalanced forces
• Resultant force

Lesson plan

• Tug of war
• Balanced and unbalanced forces
• Calculating resultant force
• Working on exercises

Learning Goals

• Recognise balanced and unbalanced forces.
  
• Name two things balanced forces can do.
  
• Name two things unbalanced forces can do.
  
• Calculate resultant force.

Class Phase

1.2 Balanced and unbalanced

forces

Balanced and unbalanced forces

• Balanced forces
• Unbalanced forces
• Resultant force

Balanced or unbalanced?

Balanced or unbalanced?

Resultant force

The effects of:

Balanced and unbalanced forces

Stationary: When an object is not moving, standing still

Constant velocity: When an object is moving at a constant speed

Acceleration: When the speed of an object is increasing (or decreasing)

Stationary: When an object is not moving, standing still

Constant velocity: When an object is moving at a constant speed

Acceleration: When the speed of an object is increasing (or decreasing)

Stationary: When an object is not moving, standing still

Constant velocity: When an object is moving at a constant speed

Acceleration: When the speed of an object is increasing (or decreasing)

Stationary: When an object is not moving, standing still

Constant velocity: When an object is moving at a constant speed

Acceleration: When the speed of an object is increasing (or decreasing)

The forces on an object are 

balanced.

How does this effect its motion when...

• It is stationary?

• it is moving at a constant speed?

Balanced Forces

When an object is...

• stationary –> It stays stationary

• Moving –> travels at a constant speed.

The forces on an object are unbalanced.

How does this effect its motion when...

• it is stationary?

• it is moving at a constant speed?

Unbalanced forces

When an object is...

• stationary –> It starts moving

• Moving –> accelerates or decelerates

	balanced forces	Unbalanced forces
stationary objects
Moving objects

	balanced forces	Unbalanced forces
stationary objects	stays stationary	starts moving
Moving objects	keeps the same speed	accelerates/ decelerates

Working on exercises

Homework:

Do: textbook 1.2 - the yellow block exercises

Do: workbook exercises 1.2

Solo Phase

Learning Goals

• Recognise balanced and unbalanced forces.
  
• Name two things balanced forces can do.
  
• Name two things unbalanced forces can do.
  
• Calculate resultant force.

Next lesson

Homework:

Do: textbook 1.2 - the yellow block exercises

Do: workbook exercises 1.2