Chapter 1; Section 1

Observing MotionReference Point:

Object that appears to stay in placeEx: Earth’s surface

YouLandscape

Motion: When an object changes position over

time when compared with a reference pointActivity: Bellringer pg 4

Speed Depends on Distance and TimeSpeed: The rate an object moves

How long it takes an object to move over time

Average Speed= total distance/ total time

SI unit for speed= meters per second (m/s)

Activity: Math Break pg 5Math and More pg 5 Using The Figure pg 5

Velocity: Direction MattersVelocity: The speed of an object in a specific

directionPlanes velocity = 600 km/h south

Activity: Self Check pg 6

Change in velocity= change in speed or direction

Combining VelocitiesCombine two velocities in same direction= add

togetherCombine two velocities in opposite directions=

subtract smaller velocity from larger velocityActivity: Independent Practice pg 7

Section Review Pg 7Answers on pg 7 in pink

Acceleration

Acceleration ContinuedCircular motion: Continuous Acceleration

Centripetal Acceleration= Change direction in a circle, changes velocity

Figure 5

Graphing Acceleration:Acceleration= positive because velocity

increases as time passes (Graph goes up)Deceleration= Graph goes down

Section Review Pg 10Answers on pg 10 in book

What is Force?Chapter 1 Section 2

Forces Act on ObjectsForces= A push or pull on an object

Size and directionNewton= How force is measured

SI unit

Activity:Pg 11 Discussion

Forces in CombinationNet Fore= The combination of forces on an

objectActivity: Pg 12 Prediction Guide

Forces in the same direction= Added TogetherForces in the opposite direction= Subtracted

from one anotherSubtract the smaller force from the larger

Activity:Pg 13 Using the figurePg 13 Self Check

Unbalanced and Balanced ForcesUnbalanced Forces=

The object moves (Change in motion)Not equal to 0Ex. Soccer Ball

Balanced Force= the object doesn’t move

Equal to 0Ex. Bird’s nest in a treeEx. Hat resting on your head

Friction: A Force That Opposes Motion

Chapter 1, Section 3

The Source of FrictionFriction: A force that opposes motion

between two surfaces that are touching.Friction depends on two things:

1. Roughness of surfaces- The rougher the surface, the more friction

Ex. Skating on ice vs. grass

2. Amount of force- the greater the force the more friction

Ex. Massive object vs. Non massive object

Activity:Pg 15: Connect to life…Pg 16: Diagram and Quick Lab

Discussion!Ways to reduce friction?

Ways to increase friction?

Activity:pg 20 apply

Gravity: A Force of Attraction

Chapter 1, Section 4

All Matter Is Affected by GravityGravity = The force between two objects due

to their massesAll objects experience an attraction toward

all other objectsEarth’s gravitational force is large= pulls

everything toward center of earthEx. Chair stays in placeEx. Dropped objects fall to earth and not

toward youActivity:

Pg 22 Reading Strategy

The Law of Universal GravitationSir Isaac Newton

Law= All object attract each other and the force depends on the objects mass and distance

Gravitational force increases when mass increasesEx. Cat is easier to pick up than elephant

Gravitational force decreases when distance increasesEx. PlanetsActivity:Pg 24 Activity

Weight Is a Measure of Gravitational Force

Weight= A measure of the gravitational force exerted on an object

Mass= Amount of matter in an object (value does not change)

Gravity is a force and is measured in Newton's

100 g is about 1 N