Force and motion
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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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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

  • THINGS AT REST TEND TO STAY AT REST.

  • THINGS IN MOTION TEND TO STAY IN MOTION.


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


DEMO

INERTIA DEMONSTRATION

TABLE CLOTH – PLACE SETTING


VIDEO

YOUTUBE

TABLECLOTH DEMO


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.


ACTIVITY

PAPER CLIP PULL

This is being replaced with the PhET sim

“forces and motion – basics”


NEWTON’S SECOND LAW

THE MATHEMATICAL FORM OF NEWTON’S SECOND LAW IS

A = F / M


ACTIVITY

NEWTON SLIDE


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


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


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)


MASS & WEIGHT

THE RELATION BETWEEN MASS AND WEIGHT IS

Wt = M g


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.


VIDEO

RECOIL OF A “CANNON”

COLLISION

CO2 ROCKET


ACTIVITY

  • TUG BOAT TUG-O-WAR

  • BALLOON ROCKET


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


FORCE AND MOTIONSUMMARY

  • DESCRIBING MOTION

  • INERTIA

  • NEWTONS THREE LAWS


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