1. Motion and Point of Reference Motion is a ___________in _____________. Determining whether or not something has changed its position depends on your ___________ __ _______________. Your point of reference is where ____ are relative to the moving object.

2. Speed Speed is the _____________ that indicates how much _______________ you traveled divided by the amount of _________ that you traveled. It is measured in meters per second (m/s). Formula = distance (meters) time (seconds) Example: You ran the 100 m dash in 20 seconds 100 m 20 s = 5 m/s (you traveled 5 meters every second you were running)

3. Velocity Velocity is the exact same formula as _____________, but it has one big difference. VELOCITY IS THE ____________ PLUS THE ______________ YOU ARE TRAVELING. Use the example from before: You ran the 100 m dash in 20 seconds 100 m 20 s = 5 m/s W (you traveled 5 meter per second in a western direction)

4. _________Speed vs. _________Speed Most of the time we calculate __________ speed (example: going to Grandma’s house). However, in some cases, an object travels at a __________ rate when the speed never changes (do you have cruise control on your car?)

5. Graphing Average Speed Suppose Grandma lived 240 miles away, and you traveled there in 4 hours. Your car traveled at different ___________________ (different speeds in different directions), and you made a few stops along the way. So your graph would not be a perfectly _________________ ____________.

6. Constant Speed If you traveled at a _________________ speed of 60 mph, then a constant speed would be graphed as a ______________ line.

7. Acceleration Most people think of acceleration as speeding up, but acceleration is actually a _____________ ____ _______________ over time. Formula: Final Velocity – Starting Velocity Time (sec) Unit is m/s 2 Or m/s/s

8. Acceleration Acceleration can occur when 1) You are ____________________ your speed (positive acceleration) 2) You are ____________________your speed (negative acceleration or deceleration) 3) You are _____________ __________________.

9. Acceleration Problems You start off riding your bike at 5 m/s. Then you go down a big hill. At the bottom of the hill your are traveling at 15 m/s. It took you 5 seconds to go from the top of the hill to the bottom of the hill 1) What was your rate of acceleration? 2) Was it positive or negative acceleration?.

10. Acceleration Problems You are riding your bike at 20 m/s. You now are having to go uphill. You don’t exert more effort, so, by the time you reach the top of the hill, you are traveling at 10 m/s. It took you 10 seconds to go from the bottom of the hill to the top. 1) Is this positive or negative acceleration? 2) what was your rate of acceleration?.

11. Momentum ______________is really a measure of how difficult it is to _________ a moving object. An object that collides with an object at rest (and bounces off )will have the ________ momentum as it had before. An object that collides with an object in motion will experience a momentum that is a ________________of both moving objects..

12. Momentum Formulas Momentum equals the ________ of an object times its ___________: p (momentum) = mv So an 20 kg object traveling at 100 m/s W: P(force) = 20 kg x 100 m/s west = 2000kg/m/s west If p = m x v, How would you find either mass or velocity (if you had force?) You would divide either into the force (P) M = p/v or V = p/m.

13. Inertia Newton’s First Law of Motion proves that objects do not move or stop moving unless there are greater (______________) forces acting upon them. Inertia is the object’s tendency to either keep moving or not moving. A force that changes this has to be strong enough to change an object’s inertia.

14. Speed Problems 1)A family traveled a total of 480 miles in 12 hours. What was their average speed? 1)Myra ran for 10 seconds, and her average speed was 6 m/s. How far did she run?.

15. Acceleration Problems 1) Sam rode brother ‘s Big Wheel He started off traveling at 2 m/s. By the time Sam broke the toy, he had traveled for 4 s at 10 m/s. What was Sam’s rate of acceleration? 2) A train arrives at a station traveling at 10 miles per hour. 30 minutes ago it was traveling at 40 miles per hour. What was the train’s rate of acceleration?.

16. Acceleration Problem 3) An airplane’s rate of acceleration is 50 m/s 2. The starting speed was 100 m/s. After a while the plane was traveling at 200 m/s. How long did it take the plane to accelerate? 4) An object with a mass of 50 kg is traveling at 14 m/s east. What is the force of this object? 5) An object thrown from a bridge has a force of 500g/m/s down. It has a mass of 125 g. What is the velocity of this object?.

17. Momentum Problems 6) An object with a mass of 50 kg is traveling at 14 m/s east. What is the force of this object? 7) An object thrown from a bridge has a force of 500g/m/s down. It has a mass of 125 g. What is the velocity of this object?