Lesson 5 — Balanced and unbalance forces

• Forces
• Voortgezet speciaal onderwijs
• Leerroute 1

1.2 Balanced and unbalanced

forces

This lesson

•  balanced and unbalanced forces
• A video
•  Resultant force
• Working on exercises

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

Balanced and unbalanced

forces

Balanced and unbalanced forces

• When there is a pair of forces
  
• Pulling in opposite or similar sides
  

Balanced forces

Balanced forces

Unbalanced Forces

Video — Exercise

• Acceleration
• Deceleration
• Constant velocity
• Stationary
• Weight
• equal

What do the words below mean?

Discuss in pairs and write down your answer

Acceleration
Decceleration
Constant velocity
Stationary
Weight
Equal

Acceleration	Speeding up
Decceleration
Constant velocity
Stationary
Weight
Equal

Acceleration	Speeding up
Decceleration	Slowing down
Constant velocity
Stationary
Weight
Equal

Acceleration	Speeding up
Decceleration	Slowing down
Constant velocity	Traveling at one speed
Stationary
Weight
Equal

Acceleration	Speeding up
Decceleration	Slowing down
Constant velocity	Traveling at one speed
Stationary	Standing still
Weight
Equal

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

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

0

Simulation

Balanced forces

•  Stationary — remains stationary
  

• Moving — moves at a steady speed

Unbalanced forces

• Standing still — Starts moving

• Moving — Accelerates or decelerates

Resultant force?

Workbook question E

	Thrust of the car (N)	Friction (N)	Air resistance (N)	Resultant force (N)
A	1500	700	800
B	3000	500	100
C	1000	600	500
D	2500	900	400

Workbook question E

	Thrust of the car (N)	Friction (N)	Air resistance (N)	Resultant force (N)
A	1500	700	800	0
B	3000	500	100
C	1000	600	500
D	2500	900	400

Workbook question E

	Thrust of the car (N)	Friction (N)	Air resistance (N)	Resultant force (N)
A	1500	700	800	0
B	3000	500	100	2600
C	1000	600	500
D	2500	900	400

Workbook question E

	Thrust of the car (N)	Friction (N)	Air resistance (N)	Resultant force (N)
A	1500	700	800	0
B	3000	500	100	2600
C	1000	600	500	100
D	2500	900	400

Workbook question E

	Thrust of the car (N)	Friction (N)	Air resistance (N)	Resultant force (N)
A	1500	700	800	0
B	3000	500	100	2600
C	1000	600	500	100
D	2500	900	400	1200

Homework

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