Friction and Gravity - ascsscience.weebly.com · •Sliding Friction-When solid surfaces slide over...
Transcript of Friction and Gravity - ascsscience.weebly.com · •Sliding Friction-When solid surfaces slide over...
![Page 1: Friction and Gravity - ascsscience.weebly.com · •Sliding Friction-When solid surfaces slide over one another •Rolling Friction-When an object rolls along a surface •Fluid Friction-When](https://reader031.fdocuments.in/reader031/viewer/2022020121/5c1c7e1f09d3f25e398b62de/html5/thumbnails/1.jpg)
Friction and Gravity
![Page 2: Friction and Gravity - ascsscience.weebly.com · •Sliding Friction-When solid surfaces slide over one another •Rolling Friction-When an object rolls along a surface •Fluid Friction-When](https://reader031.fdocuments.in/reader031/viewer/2022020121/5c1c7e1f09d3f25e398b62de/html5/thumbnails/2.jpg)
Friction
• The force one object exerts on another when they move past each other
– Strength depends on:
• Types of surfaces involved
• How close the surfaces are to each other
• Example
![Page 3: Friction and Gravity - ascsscience.weebly.com · •Sliding Friction-When solid surfaces slide over one another •Rolling Friction-When an object rolls along a surface •Fluid Friction-When](https://reader031.fdocuments.in/reader031/viewer/2022020121/5c1c7e1f09d3f25e398b62de/html5/thumbnails/3.jpg)
Type of surface involved
• Imagine skiing or snowmobiling on bare ground…what would happen?
![Page 4: Friction and Gravity - ascsscience.weebly.com · •Sliding Friction-When solid surfaces slide over one another •Rolling Friction-When an object rolls along a surface •Fluid Friction-When](https://reader031.fdocuments.in/reader031/viewer/2022020121/5c1c7e1f09d3f25e398b62de/html5/thumbnails/4.jpg)
The type of surface determines friction
• Snow grips the skis less…
– Therefore there is less friction
• Dirt grips the skis more…
– Therefore there is more friction
– So much that it may cause
![Page 5: Friction and Gravity - ascsscience.weebly.com · •Sliding Friction-When solid surfaces slide over one another •Rolling Friction-When an object rolls along a surface •Fluid Friction-When](https://reader031.fdocuments.in/reader031/viewer/2022020121/5c1c7e1f09d3f25e398b62de/html5/thumbnails/5.jpg)
How hard surfaces push against each other
• The harder two surfaces push against eachother…the more friction is produced
– Atoms rubbing against each other
– Example
• Fish tank demo/Class demo
– Mass can increase friction
![Page 6: Friction and Gravity - ascsscience.weebly.com · •Sliding Friction-When solid surfaces slide over one another •Rolling Friction-When an object rolls along a surface •Fluid Friction-When](https://reader031.fdocuments.in/reader031/viewer/2022020121/5c1c7e1f09d3f25e398b62de/html5/thumbnails/6.jpg)
Useful Friction
• List some examples of how friction helps/doesn’t help you.
• You will be responsible for this on a test/quiz
![Page 7: Friction and Gravity - ascsscience.weebly.com · •Sliding Friction-When solid surfaces slide over one another •Rolling Friction-When an object rolls along a surface •Fluid Friction-When](https://reader031.fdocuments.in/reader031/viewer/2022020121/5c1c7e1f09d3f25e398b62de/html5/thumbnails/7.jpg)
Controlling Friction
• Sliding Friction-When solid surfaces slide over one another
• Rolling Friction-When an object rolls along a surface
• Fluid Friction-When an object moves through a liquid or gas
![Page 8: Friction and Gravity - ascsscience.weebly.com · •Sliding Friction-When solid surfaces slide over one another •Rolling Friction-When an object rolls along a surface •Fluid Friction-When](https://reader031.fdocuments.in/reader031/viewer/2022020121/5c1c7e1f09d3f25e398b62de/html5/thumbnails/8.jpg)
Sliding Friction
![Page 9: Friction and Gravity - ascsscience.weebly.com · •Sliding Friction-When solid surfaces slide over one another •Rolling Friction-When an object rolls along a surface •Fluid Friction-When](https://reader031.fdocuments.in/reader031/viewer/2022020121/5c1c7e1f09d3f25e398b62de/html5/thumbnails/9.jpg)
Rolling Friction
![Page 10: Friction and Gravity - ascsscience.weebly.com · •Sliding Friction-When solid surfaces slide over one another •Rolling Friction-When an object rolls along a surface •Fluid Friction-When](https://reader031.fdocuments.in/reader031/viewer/2022020121/5c1c7e1f09d3f25e398b62de/html5/thumbnails/10.jpg)
Fluid Friction
![Page 11: Friction and Gravity - ascsscience.weebly.com · •Sliding Friction-When solid surfaces slide over one another •Rolling Friction-When an object rolls along a surface •Fluid Friction-When](https://reader031.fdocuments.in/reader031/viewer/2022020121/5c1c7e1f09d3f25e398b62de/html5/thumbnails/11.jpg)
• Would skiing be an example of fluid friction, rolling friction or sliding friction?
• Would running be an example of fluid friction, rolling friction or sliding friction?
• Would dropping a rock in water be an example of fluid friction, rolling friction or sliding fricition?
![Page 12: Friction and Gravity - ascsscience.weebly.com · •Sliding Friction-When solid surfaces slide over one another •Rolling Friction-When an object rolls along a surface •Fluid Friction-When](https://reader031.fdocuments.in/reader031/viewer/2022020121/5c1c7e1f09d3f25e398b62de/html5/thumbnails/12.jpg)
Gravity
• Is a forces that pulls objects towards each other.
![Page 13: Friction and Gravity - ascsscience.weebly.com · •Sliding Friction-When solid surfaces slide over one another •Rolling Friction-When an object rolls along a surface •Fluid Friction-When](https://reader031.fdocuments.in/reader031/viewer/2022020121/5c1c7e1f09d3f25e398b62de/html5/thumbnails/13.jpg)
Free Fall
• When the only force acting on an object is gravity…an object is in free fall.
![Page 14: Friction and Gravity - ascsscience.weebly.com · •Sliding Friction-When solid surfaces slide over one another •Rolling Friction-When an object rolls along a surface •Fluid Friction-When](https://reader031.fdocuments.in/reader031/viewer/2022020121/5c1c7e1f09d3f25e398b62de/html5/thumbnails/14.jpg)
Projectile Motion
• Projectile-an object is launched horizontally
– Example
![Page 15: Friction and Gravity - ascsscience.weebly.com · •Sliding Friction-When solid surfaces slide over one another •Rolling Friction-When an object rolls along a surface •Fluid Friction-When](https://reader031.fdocuments.in/reader031/viewer/2022020121/5c1c7e1f09d3f25e398b62de/html5/thumbnails/15.jpg)
Air Resistance
• Fluid friction that deals with traveling though air
• Hand Planes
![Page 16: Friction and Gravity - ascsscience.weebly.com · •Sliding Friction-When solid surfaces slide over one another •Rolling Friction-When an object rolls along a surface •Fluid Friction-When](https://reader031.fdocuments.in/reader031/viewer/2022020121/5c1c7e1f09d3f25e398b62de/html5/thumbnails/16.jpg)
Weight vs. Mass
• Mass-How much matter is in an object
• Weight-The force of gravity pulling on an object
– Varies
– Weight =Mass x Acceleration due to gravity
![Page 17: Friction and Gravity - ascsscience.weebly.com · •Sliding Friction-When solid surfaces slide over one another •Rolling Friction-When an object rolls along a surface •Fluid Friction-When](https://reader031.fdocuments.in/reader031/viewer/2022020121/5c1c7e1f09d3f25e398b62de/html5/thumbnails/17.jpg)
Universal Gravitation
• States that the force of gravity acts on all objects in the universe
• You have gravity
• Strength depends on distance and mass
– Large close object=more gravity
– Small distant object=less gravity