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FORCE AND MOTION

FORCE AND MOTION. FORCE AND MOTION. FORCES ARE REQUIRED TO CHANGE THE MOTION OF OBJECTS. NEWTON’S LAWS DEFINE THE RELATIONSHIP BETWEEN: FORCE MASS (INERTIA) ACCELERATION. KEY TOPICS. INERTIA NEWTON’S FIRST LAW NEWTON’S SECOND LAW WEIGHT NEWTON’S THIRD LAW. INERTIA.

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FORCE AND MOTION

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  1. FORCE AND MOTION

  2. FORCE AND MOTION • FORCES ARE REQUIRED TO CHANGE THE MOTION OF OBJECTS. • NEWTON’S LAWS DEFINE THE RELATIONSHIP BETWEEN: • FORCE • MASS (INERTIA) • ACCELERATION

  3. KEY TOPICS • INERTIA • NEWTON’S FIRST LAW • NEWTON’S SECOND LAW • WEIGHT • NEWTON’S THIRD LAW

  4. INERTIA • THINGS AT REST TEND TO STAY AT REST. • THINGS IN MOTION TEND TO STAY IN MOTION.

  5. INERTIA • DEFINITION: RESISTANCE TO CHANGES TO MOTION • AN ALTERNATE MEASURE OF THE MASS OF AN OBJECT IT IS MEASURED USING THE GRAM FAMILY THE KILOGRAM IS MOST OFTEN USED IN NEWTON’S LAWS

  6. DEMO INERTIA DEMONSTRATION TABLE CLOTH – PLACE SETTING

  7. VIDEO YOUTUBE TABLECLOTH DEMO

  8. NEWTON’S FIRST LAW IF THE SUM OF ALL THE FORCES UPON AN OBJECT IS ZERO • AN OBJECT AT REST WILL STAY AT REST • AN OBJECT IN MOTION WILL STAY IN MOTION WITH CONSTANT SPEED AND MOVE IN A STRAIGHT LINE.

  9. ACTIVITY PAPER CLIP PULL This is being replaced with the PhET sim “forces and motion – basics”

  10. NEWTON’S SECOND LAW THE MATHEMATICAL FORM OF NEWTON’S SECOND LAW IS A = F / M

  11. ACTIVITY NEWTON SLIDE

  12. Question The acceleration on an object is “a”. If the force on the object is doubled and its mass is cut in half, what will be its new acceleration? • 2a • A • 4a • NOTA

  13. WEIGHT • THE FORCE DUE TO GRAVITY UPON AN OBJECT • THE FORCE POINTS TO THE CENTER OF THE EARTH • THE AMOUNT OF FORCE CAN BE CALCULATED BY WRITING THE SECOND LAW AS F = M A

  14. MASS & WEIGHT • THE RELATION BETWEEN MASS (M) AND WEIGHT (Wt) CAN BE FOUND FROM F = M A • THE FORCE F IS REPLACE BY Wt AND THE ACCELERATION IS REPLACED WITH THE ACCELERATION DUE TO GRAVITY (g)

  15. MASS & WEIGHT THE RELATION BETWEEN MASS AND WEIGHT IS Wt = M g

  16. NEWTON’S THIRD LAW IF AN OBJECT EXERTS A FORCE ON A SECOND OBJECT, THE SECOND EXERTS AN EQUAL BUT OPPOSITE FORCE ON THE FIRST.

  17. VIDEO RECOIL OF A “CANNON” COLLISION CO2 ROCKET

  18. ACTIVITY • TUG BOAT TUG-O-WAR • BALLOON ROCKET

  19. Question When a bug splatters upon a windshield, the force on the bug is _______ the force on the windshield. • greater than • less than • Equal to

  20. FORCE AND MOTIONSUMMARY • DESCRIBING MOTION • INERTIA • NEWTONS THREE LAWS

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