Chapter 1- MotionHow can an objects motion be described?

Homework: Finish, “What I Learned,” List Started in class in notebook. Read pgs. 7-11 in textbook

Do Now: Write down homework, Open textbook to pg. 6

Update TOC: pg. 20- Chapter 1-Motion Title page Pg. 21- Describing Motion

April 21, 2014- Welcome Back!

What I know:An object is moving when it changes position

Objects move at different speedsThis effects how long it takes for an object to travel a certain distance..

Motion- What do you know about Motion?

Motion- An object is in motion if its distance from another object is changing.

Reference point- is a place or object used for comparison to determine is something is in motion.

An object is in motion if it changes position relative to a reference point.

Describing Motion-Read pg.6

Are students on a bus moving compared to a person standing on the side walk? Why?◦Yes, because the distance between the

students and the person on the sidewalk is changing

Are the students seated on the bus moving compared to the bus? Why?◦No, because the distance between the bus

and the students does not change.

Moving or Not Moving??

Objects that are stationary, (not moving). Examples:

What makes a good reference point?

If you choose a moving reference point, ◦You may think that you are moving when you are not◦Or that you are moving faster or slower than you really are.

Read over pg. 7 to pg. 8

Why is it important to chose a stationary object as a reference point?

Something I learned about motion Another thing I learned about motion One more thing I learned about motion

What I learned…. (pages 7-9)

Homework: Speed worksheet.

Do Now: Write down homework, Update TOC : pg. 22- Calculating speedOpen textbook to pages 10 & 11: Then Define: all highlighted terms and write the speed equation, on pg. 22

Today I will Calculate an objects speed

April 22, 2014

To measure distance the SI unit used is for length is meter (m).

Motion is compared to a reference point

What I learned…

The distance an object travels per unit of time.

If you know the distance an object travels in a certain amount of time you can calculate the speed

Speed:

Speed = Distance/ Time

What is the Speed of a asteroid traveling 4500km in 6 seconds?

What are two ways to increase this speed?◦Increase the distance◦Decrease the time

Calculating Speed

Average Speed: The total distance divided by the total time

Instantaneous Speed: The rate that an object is moving at a given instant of time.

Avg. Speed and Instantaneous Speed