# FORCE AND MOTION - PowerPoint PPT Presentation

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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

• 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

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

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