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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
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
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
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
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