Frictional Forces LO: to describe the force which opposes movement and investigate the best shape...
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Transcript of Frictional Forces LO: to describe the force which opposes movement and investigate the best shape...
![Page 1: Frictional Forces LO: to describe the force which opposes movement and investigate the best shape for a glider TASK: 1. 1. Lightly push your book across.](https://reader036.fdocuments.us/reader036/viewer/2022070403/56649f2e5503460f94c48224/html5/thumbnails/1.jpg)
Frictional Forces
LO: to describe the force which opposes movement and investigate the best shape
for a glider
TASK: 1.
1. Lightly push your book across the table. Why does it stop moving?
2. Rub your hands together and write down your observations
3. Make a list of useful friction and non useful friction
![Page 2: Frictional Forces LO: to describe the force which opposes movement and investigate the best shape for a glider TASK: 1. 1. Lightly push your book across.](https://reader036.fdocuments.us/reader036/viewer/2022070403/56649f2e5503460f94c48224/html5/thumbnails/2.jpg)
Space shuttle re entry
Friction occurs whenever 2 moving surfaces come in to contact with each other. Its direction is always opposite to the driving force.
Friction produces heat.
Air and water resistance (drag) are both kinds of friction.
![Page 3: Frictional Forces LO: to describe the force which opposes movement and investigate the best shape for a glider TASK: 1. 1. Lightly push your book across.](https://reader036.fdocuments.us/reader036/viewer/2022070403/56649f2e5503460f94c48224/html5/thumbnails/3.jpg)
11.3 FrictionFor each picture, discuss and then write down where friction is produced?
![Page 4: Frictional Forces LO: to describe the force which opposes movement and investigate the best shape for a glider TASK: 1. 1. Lightly push your book across.](https://reader036.fdocuments.us/reader036/viewer/2022070403/56649f2e5503460f94c48224/html5/thumbnails/4.jpg)
What links all these pictures?Streamlining and lubrication are used to reduce
friction
Lubrication video
![Page 5: Frictional Forces LO: to describe the force which opposes movement and investigate the best shape for a glider TASK: 1. 1. Lightly push your book across.](https://reader036.fdocuments.us/reader036/viewer/2022070403/56649f2e5503460f94c48224/html5/thumbnails/5.jpg)
Air resistance class challengeTASK: Who can make the best glider?
From one piece of A4 paper you have to make a shape which takes the longest time to reach the floor from the ceiling
Remember you have to increase air resistance
HINT: think about things in nature which glide to the floor
Lubrication video
![Page 6: Frictional Forces LO: to describe the force which opposes movement and investigate the best shape for a glider TASK: 1. 1. Lightly push your book across.](https://reader036.fdocuments.us/reader036/viewer/2022070403/56649f2e5503460f94c48224/html5/thumbnails/6.jpg)
Table of results
![Page 7: Frictional Forces LO: to describe the force which opposes movement and investigate the best shape for a glider TASK: 1. 1. Lightly push your book across.](https://reader036.fdocuments.us/reader036/viewer/2022070403/56649f2e5503460f94c48224/html5/thumbnails/7.jpg)
Homework
Imagine you wake up tomorrow morning in a world without friction?
Explain what would be good about this world?
Explain what would be difficult to do in this world?
![Page 8: Frictional Forces LO: to describe the force which opposes movement and investigate the best shape for a glider TASK: 1. 1. Lightly push your book across.](https://reader036.fdocuments.us/reader036/viewer/2022070403/56649f2e5503460f94c48224/html5/thumbnails/8.jpg)
Plenary- True/FalseSnow increases the friction between your shoes and the ground.
Shoelaces stay tied up because of friction
Cars need friction to keep moving.
Matches light because of friction
Cars need friction to stop.
Pencils need friction to write
There is no air resistance in space
![Page 9: Frictional Forces LO: to describe the force which opposes movement and investigate the best shape for a glider TASK: 1. 1. Lightly push your book across.](https://reader036.fdocuments.us/reader036/viewer/2022070403/56649f2e5503460f94c48224/html5/thumbnails/9.jpg)
What is the best lubricant?
Lubricant used Friction on block (N)
Friction on block with lubricant (N)
Difference in friction (N)
Vegetable oil
Washing up liquid
Water
Soap