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PS CH 10 SEC 2

PS CH 10 SEC 2. FRICTION, GRAVITY, ELASTIC FORCES. GOAL/PURPOSE. PREVIOUSLY YOU LEARNED ABOUT FORCES AND COMBINING FORCES. NOW, YOU WILL CONTINUE TO COMBINE FORCES AND LEARN HOW GRAVITY AND FRICTION AFFECT MOTION. FRICTION.

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PS CH 10 SEC 2

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  1. PS CH 10 SEC 2 FRICTION, GRAVITY, ELASTIC FORCES

  2. GOAL/PURPOSE • PREVIOUSLY YOU LEARNED ABOUT FORCES AND COMBINING FORCES. • NOW, YOU WILL CONTINUE TO COMBINE FORCES AND LEARN HOW GRAVITY AND FRICTION AFFECT MOTION

  3. FRICTION • FRICTION- IS A FORCE THAT TWO SURFACES EXERT ON EACH OTHER WHEN THEY RUB AGAINST EACH OTHER. • KEY- THE STRENGTH OF THE FORCE OF FRICTION DEPENDS ON THE TYPES OF SURFACES INVOLVED AND HOW HARD THE SURFACES PUSH TOGETHER. • KEY- FRICTION INCREASES WITH ROUGH SURFACES AND PRESSURE

  4. SKETCH

  5. TYPES OF FRICTION • STATIC FRICTION- THE FRICTION THAT ACTS ON OBJECT THAT AREN'T MOVING • EX – PUSHING THE DESK ACROSS FLOOR • SLIDING FRICTION- OCCURS WHEN TWO SOLID OBJECTS SLIDE OVER EACH OTHER • EX- BICYCLE BRAKES

  6. CONT’D • ROLLING FRICTION- WHEN AN OBJECT ROLLS ACROSS A SURFACE. LESS THAN SLIDING FRICTION • EX- WHEELS, BEARINGS • FLUID FRICTION- OCCURS WHEN A SOLID OBJECT MOVES THROUGH A FLUID. LES THAN SLIDING • EX- MACHINES, SURFING

  7. GRAVITY • GRAVITY- IS A FORCE THAT PULLS OBJECTS TOWARD EACH OTHER • KEY- ALL OBJECTS EXERT GRAVITY • EX- SOLAR SYSTEM, MOON, EARTH • KEY- THE FORCE OF GRAVITY BETWEEN OBJECTS INCREASES WITH GREATER MASS AND DECREASES WITH GREATER DISTANCE

  8. ANSWER THE FOLLOWING P.388 • 1ABC • 2ABC • 3AB • http://www.brainpop.com/science/motionsforcesandtime/gravity/

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