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1.4 identify whether the forces acting on an object are balanced or unbalanced.
1.5 predict the net effect of unbalanced forces.
Activity 1.4A
Activity 1.4A
A. View video: 7th Tug-of-war https://www.youtube.com/watch?v=D-t0eYQ [1.48 mins]
B. Answer the questions below using 7-13 word sentences:
What force is acting?
Why do the people move?
If you were building a tug-of-war team, what would it look like?
Activity 1.4A
Activity 1.4A
A. View video: 7th Tug-of-war https://www.youtube.com/watch?v=D-t0eYQ [1.48 mins]
B. Answer the questions below using 7-13 word sentences:
What force is acting?
Why do the people move?
If you were building a tug-of-war team, what would it look like?
4. What factors help the tug-of-war teams to win? Write 7-13 word sentences to explain.
Activity 1.4B You will need your toy car.
Activity 1.4B You will need your toy car.
Interact with the Presentationand complete the tasks.
Push your toy car and observe its movement.
Write sentences to explain the unbalanced forces as you move it and as it comes to rest.
7.5 FAW 1.5 Balancing Forces M.pptxActivity 14B You will need your toy car.
Activity 14B You will need your toy car.
Interact with the Presentation and complete the tasks.
7.5 FAW 1.5 Balancing Forces E.pptxActivity 1.4C
Activity 1.4C
Complete the Worksheet
7 FAW 1.4 Balanced Forces WS Pearson p279 M.docxActivity 1.4C
Activity 1.4C
Complete the Worksheet
7 FAW 1.4 Balanced Unbalanced p279 WS.docx7 FAW 1.4 Prac Force Meter.pdfActivity 1.5B
Activity 1.5B
7 FAW 1.4 How do Toys Move.pdfActivity 1.5B
Activity 1.5B
Complete the Worksheet. You may need a calculator.
7 FAW 1.4 Balancing Forces WS.pdfI can...
1.6 describe examples of technological developments that can reduce the negative impact of forces in our everyday life.
Practical 1.6A Cup of water relay challenge.
Practical 1.6A Cup of water relay challenge.
Forces make the world go around (literally) and help us every day.
** Quick-write to your desk: one way that forces help us (not in transport). Call teacher to check.
But some forces are harmful and even life-threatening. People have been looking for ways to reduce the negative impact of forces on people since they lived in caves.
Seatbelts, airbags and headrests are examples of passive safety features - they are don't act until we need them, in a crash or a sudden stop or swerve, when their job is to lessen the forces acting on the vehicle's occupants. It’s better to avoid a car accident in the first place and so modern cars include active safety features. These features are designed to reduce the chance of an accident occurring.
Activity 1.6A
Activity 1.6A
Research to find 3 ways technology is used to protect us from bad effects of force (not in transport). Write dot points of what and how into your record.
Activity 1.6A
Activity 1.6A
Research to find 5 ways technology is used to protect us from negative effects of forces (not in transport). Write dot points of what and how into your record.
Practical 1.6B Crash Test Dummy
Practical 1.6B Crash Test Dummy
Activity 1.6B link broken find replacement
Activity 1.6B link broken find replacement
A. View and complete the interactive: http://www.scootle.edu.au/ec/viewing/L491/sc_002_clt_302/index.html
B. Complete the Worksheet (download by clicking the arrow top right, then the download arrow at the top of the page that opens.)
Activity 1.6C Read the following extract from your text pp 281-2
Activity 1.6C Read the following extract from your text pp 281-2
Why do we need safety additions in cars?
Why do we need safety additions in cars?
One of the most dramatic examples of negative impact of forces on people is the impact of a person's body hitting the inside of the car in a car crash. Scientists have been working for many decades to solve this problem and new features are added every few years.
When something stops the car, like brakes or a car crash, it doesn’t stop us because we are not part of the car. For us to stop and not continue through the windscreen, we need to be part of the car - attached to it with a seatbelt or a harness. A seatbelt holds us as part of the seat, although not as well as a harness.
Even with the seatbelt we can be thrown far enough forward to hit the windscreen. Air bags at the front can help prevent this. Seatbelts also do not work as well for side crashes, so side airbags are often fitted.
The seatbelt can stop us so suddenly that we are forced backwards, then we need the headrest to cushion and stop that sudden backward movement.
If we were hit by another car and the glass shattered, we could be seriously hurt, so safety glass that doesn't produce sharp pieces is used in the car windows.
Cars are built to crumple in a particular pattern that makes it the safest it can be. These are called crumple zones.
Reference Pearson Y7 pages 281-2
Activity 1.6D
Activity 1.6D
View videos below:
Crash dummy with and without safety additions https://www.youtube.com/watch?v=d7iYZPp2zYY [0.42 mins]
With harness: https://www.youtube.com/watch?v=URnhg0mbSWk [0.49 mins]
Activity 1.6E
Activity 1.6E
Answer the questions below
1. What happens to you if the car you are in suddenly swerves to the right? Try this in your seat.
2. Where else can people experience this?
3. Do you think buses and trains should have seat belts? Why or why not?
4. Why do babies have harnessed capsules rather than seat belts?
The tendency for something to keep moving unless it is stopped by an opposing force is called inertia (in - er- sha).
Activity 1.6E
Activity 1.6E
The tendency for something to keep moving unless it is stopped by an opposing force is called inertia (in - er- sha). Newton described it in his First Law of Motion (he had three laws of motion).
A body (science word for object) will remain in a state of rest or uniform (the same) motion unless acted upon by an external unbalanced force.
A. View video Newton’s First Law https://www.youtube.com/watch?v=8zsE3mpZ6Hw [1.32 mins]
B. Answer the questions:
1. What happens to you if the car you are in suddenly swerves to the right?
2a. Where else can people experience inertia?
2b. What safety measures are used for these?
3. Do you think all moving vehicles should have seat belts? Why or why not?
4. Why do babies have harnessed capsules rather than seat belts?
Activity 1.6F
Activity 1.6F
Download the diagram of the Ferrari from below. (Save it into Slides or PPT. Use text boxes over, then screenshot or Snip.)
Use the link (or Box of Books app) to open the Pearson 7 text to pages 281-2
Label the passive safety features onto the diagram.
Label three active safety features onto the diagram.
Upload here
Activity 1.6G
Activity 1.6G
Complete Live Worksheet2
Activity 1.6F
Activity 1.6F
Download the diagram of the Ferrari from below. (Save it into Slides or PPT. Use text boxes over, then screenshot or Snip.)
Use the link (or Box of Books app) to open the Pearson 7 text to pages 281-2
Label the passive safety features onto the diagram.
Label the active safety features onto the diagram.
Upload here.
Activity 1.6G
Activity 1.6G
Complete Live Worksheet
EXTRA FOR INTEREST:
EXTRA FOR INTEREST:
REVIEW
REVIEW
Review: Activity 1.7A
Review: Activity 1.7A
List two times you have pushed something today.
List two times you have pulled something today.
Draw a diagram to show two unbalanced forces. What would happen in your diagram?
Review: Activity 1.7A
Review: Activity 1.7A
List four times you have pushed something today. Include at least one "invisible force".
List four times you have pulled something today. Include at least one "invisible force".
Draw a diagram to show four unbalanced forces. What would result from this?
Review Activity 1.7B
Review Activity 1.7B
Visit Pearson 7 Text
Remembering Q1-4
Analysing Q13a, b, f, g; 14
Evaluating Q15b
Review Activity 1.7B
Review Activity 1.7B
Visit Pearson 7 Text
Go to Page 283 and complete
Remembering Q3, 4
Applying Q11
Analysing Q13a, b, f, g; 14
Evaluating Q15b
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