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FORCE AND MOTION

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

- INERTIA
- NEWTON’S FIRST LAW
- NEWTON’S SECOND LAW
- WEIGHT
- NEWTON’S THIRD LAW

- THINGS AT REST TEND TO STAY AT REST.
- THINGS IN MOTION TEND TO STAY IN MOTION.

- 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

INERTIA DEMONSTRATION

TABLE CLOTH – PLACE SETTING

YOUTUBE

TABLECLOTH DEMO

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.

PAPER CLIP PULL

This is being replaced with the PhET sim

“forces and motion – basics”

THE MATHEMATICAL FORM OF NEWTON’S SECOND LAW IS

A = F / M

NEWTON SLIDE

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

- 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

- 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)

THE RELATION BETWEEN MASS AND WEIGHT IS

Wt = M g

IF AN OBJECT EXERTS A FORCE ON A SECOND OBJECT, THE SECOND EXERTS AN EQUAL BUT OPPOSITE FORCE ON THE FIRST.

RECOIL OF A “CANNON”

COLLISION

CO2 ROCKET

- TUG BOAT TUG-O-WAR
- BALLOON ROCKET

When a bug splatters upon a windshield, the force on the bug is _______ the force on the windshield.

- greater than
- less than
- Equal to

- DESCRIBING MOTION
- INERTIA
- NEWTONS THREE LAWS