What is Friction ( contact force ) Force that acts when two objects rub (contact) each other...
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Transcript of What is Friction ( contact force ) Force that acts when two objects rub (contact) each other...
![Page 1: What is Friction ( contact force ) Force that acts when two objects rub (contact) each other Friction comes from solid, air or water //phet.colorado.edu/sims/friction/friction_en.html.](https://reader037.fdocuments.net/reader037/viewer/2022110303/551429ea5503466d1a8b4c8c/html5/thumbnails/1.jpg)
What is Friction ( contact force )Force that acts when two objects rub (contact)
each otherFriction comes from solid, air or water
http://phet.colorado.edu/sims/friction/friction_en.html ( Let us visit this website)
![Page 2: What is Friction ( contact force ) Force that acts when two objects rub (contact) each other Friction comes from solid, air or water //phet.colorado.edu/sims/friction/friction_en.html.](https://reader037.fdocuments.net/reader037/viewer/2022110303/551429ea5503466d1a8b4c8c/html5/thumbnails/2.jpg)
How does Friction affects motion?
Friction opposes movement
![Page 3: What is Friction ( contact force ) Force that acts when two objects rub (contact) each other Friction comes from solid, air or water //phet.colorado.edu/sims/friction/friction_en.html.](https://reader037.fdocuments.net/reader037/viewer/2022110303/551429ea5503466d1a8b4c8c/html5/thumbnails/3.jpg)
How does Friction affects motion?
Slows down
![Page 4: What is Friction ( contact force ) Force that acts when two objects rub (contact) each other Friction comes from solid, air or water //phet.colorado.edu/sims/friction/friction_en.html.](https://reader037.fdocuments.net/reader037/viewer/2022110303/551429ea5503466d1a8b4c8c/html5/thumbnails/4.jpg)
How does Friction affects motion?
Getting moving
![Page 5: What is Friction ( contact force ) Force that acts when two objects rub (contact) each other Friction comes from solid, air or water //phet.colorado.edu/sims/friction/friction_en.html.](https://reader037.fdocuments.net/reader037/viewer/2022110303/551429ea5503466d1a8b4c8c/html5/thumbnails/5.jpg)
How does Friction affects motion?
Getting moving
![Page 6: What is Friction ( contact force ) Force that acts when two objects rub (contact) each other Friction comes from solid, air or water //phet.colorado.edu/sims/friction/friction_en.html.](https://reader037.fdocuments.net/reader037/viewer/2022110303/551429ea5503466d1a8b4c8c/html5/thumbnails/6.jpg)
How does Friction affects motion?
Grip or stop
![Page 7: What is Friction ( contact force ) Force that acts when two objects rub (contact) each other Friction comes from solid, air or water //phet.colorado.edu/sims/friction/friction_en.html.](https://reader037.fdocuments.net/reader037/viewer/2022110303/551429ea5503466d1a8b4c8c/html5/thumbnails/7.jpg)
Factors affecting friction ( surface)http://www.bbc.co.uk/schools/scienceclips/ages/8_9/friction.shtml ( visit this website)
Smooth surface Rough surface
Lesser bump and hollows means lesser
frictioncan move the object continuously with little
force.
More bump and hollows means more friction
Can move the object slowly with greater force
![Page 8: What is Friction ( contact force ) Force that acts when two objects rub (contact) each other Friction comes from solid, air or water //phet.colorado.edu/sims/friction/friction_en.html.](https://reader037.fdocuments.net/reader037/viewer/2022110303/551429ea5503466d1a8b4c8c/html5/thumbnails/8.jpg)
Smooth surfaceThe smoother the surface the faster the object glides with little force
![Page 9: What is Friction ( contact force ) Force that acts when two objects rub (contact) each other Friction comes from solid, air or water //phet.colorado.edu/sims/friction/friction_en.html.](https://reader037.fdocuments.net/reader037/viewer/2022110303/551429ea5503466d1a8b4c8c/html5/thumbnails/9.jpg)
Rough surfaceObjects will move slowly with greater force on the rough surface.
![Page 10: What is Friction ( contact force ) Force that acts when two objects rub (contact) each other Friction comes from solid, air or water //phet.colorado.edu/sims/friction/friction_en.html.](https://reader037.fdocuments.net/reader037/viewer/2022110303/551429ea5503466d1a8b4c8c/html5/thumbnails/10.jpg)
Factors affecting frictionAir Resistance Example:Is the force that provide a backward
forceSize and shape are the
factors that affect air resistance. ( the
bigger the size and shape the more is the
air resistance)
http://www.youtube.com/watch?v=oTMLXBeQ40E
http://www.youtube.com/watch?NR=1&v=ur40O6nQHsw
![Page 11: What is Friction ( contact force ) Force that acts when two objects rub (contact) each other Friction comes from solid, air or water //phet.colorado.edu/sims/friction/friction_en.html.](https://reader037.fdocuments.net/reader037/viewer/2022110303/551429ea5503466d1a8b4c8c/html5/thumbnails/11.jpg)
Friction: Good and BadGood BadHold objectsStops objectAble to play ,run ,walk
etcGives energy
Shoes, slippers , tires and anything that are used for moving are worn out.
Machine become less efficient
Reduce speed Cause accidents Cause sparks
![Page 12: What is Friction ( contact force ) Force that acts when two objects rub (contact) each other Friction comes from solid, air or water //phet.colorado.edu/sims/friction/friction_en.html.](https://reader037.fdocuments.net/reader037/viewer/2022110303/551429ea5503466d1a8b4c8c/html5/thumbnails/12.jpg)
Ways of reducing frictionApplying wax or polishingUse rotating objectsStreamliningNew design shoes for the athletes