Welcome back to Class!

TOC – Describe Locations 10-29

How do you describe the location of an object? Choose an object in the classroom that is EASY to see. Do not point to, describe or name the object. Give specific directions in your science notebook. Ask your classmate to identify the object using your directions.

TOC- PHYSICS NOTES WRITE THE NOTES IN YOUR SCIENCE NOTEBOOK.WRITE THE NOTES IN YOUR SCIENCE NOTEBOOK.

POSITION Position - of a place or an object is the LOCATION of that place or object.

IN YOUR SCIENCE NOTEBOOK DO THIS ACTIVITY Using as many reference points as you can, tell me how to walk from your desk to the snack bar.

REFERENCE POINT A LOCATION TO WHICH YOU COMPARE OTHER LOCATIONS

The illustration below during shows a ball at several positions its bounce. If you were to watch it thrown you would see that the ball is in motion.

Motion- pg 9. in book Motion is the change in position over time. (glossary word) As the ball bounces both its horizontal and vertical positions change. (glossary word) If you missed the bounce you would still know that motion happened. How? Because a change of position occurred. That is evidence of motion.

MOTION MOTIONA CHANGE IN AN OBJECT’S POSITION TELLS YOU THAT MOTION TOOK PLACE HOW QUICKLYIT DOESN’T TELL YOU HOW QUICKLY THE OBJECT CHANGED POSITION.

Relative Motion If you sit still in your chair, you are not moving. Or are you? You do not notice your position changing relative to everything else in the room. But if we could observe you from space, we could see that you are constantly changing positions with the Earth as it travels around the Sun.

Consider your car or bus ride to school… An observer in the car would say that the stop sign changed positions and the car did not. An observer by the sign would say that the car changed positions and the sign did not.

Speed is a measure of how quickly or slowly an object changes position. (glossary word)

SPEED The greater the speed, the faster it changes position. Speed is the rate at which the distance an object CHANGES compared to time.

RATE The way in which one quantity (number) changes compared to another quantity (number) is called a rate

SPEED Need to know distance and time Distance – meters, kilometers..most common Time- seconds, hours S= d/t Standard unit for speed is meters per second (m/s) or (km/hr)

AVERAGE SPEED Speed is not constant…when you run you speed up, slow down etc.

Lab Activity – Units for Certain Situations Each of your teams is going to do 2 examples off of the table. Then we will fill in the table together

Major Units Liters- volume Meters- distance Grams- mass On Learning Check

Situations and Units SituationUnitExplanation Mass of a Car Mass of a Person Mass of a Sandwich Mass of an insect Mass of an Insect Mass of a Planet Mass of a Baby Mass of a Ball of Clay Mass of a Bike

Mass of a Penny Mass of an elephant Mass of an Airplane Distance between 2 cities Length of an ant Height of a building Length of a Car Height of a Car Height of a Horse Volume of a Bathtub

Volume of a lake Volume of a Shoe Box Distance Between two kitchen tiles Thickness of a paper clip Height of a room Width of a brick Length of someone’s hair

Volume of a coffee mug Volume of a medicine cup Volume of a pop bottle