1. Speed, Velocity, and Acceleration
Motion
Speed, Velocity, and Acceleration

2. Frames of Reference
The object or point from which movement is determined
Movement is relative to an object that appears stationary
Earth is the most common frame of reference

3. Questions What is the frame of reference for the sunset?
What is a frame of reference?
What is the most common frame of reference?

4. Question
When can you determine how fast you are going in a jet plane?

5. Motion Motion is a change in position relative to a frame of reference
Speed is the distance traveled in a given amount of time
Speed=distance
time

6. Speed The units for speed: meters/second (m/sec)
kilometers/hour (km/hr)
Speed that does not change is constant speed

7. Average speed Total distance divided by the total time Formula:

8. Velocity Speed in a given direction
Velocities in the same direction combine by adding
Velocities in different directions combine by subtracting

9. Interesting fact
Rockets are launched in the same direction of the earth’s rotation to get an extra boost of 1800 km/hr to its speed

10. Questions
What is motion?
What is speed? How is it calculated?
What is average speed?

11. Questions How is velocity different from speed?
Which two factors determine an object’s velocity?

12. Acceleration The change in velocity
Acceleration is measured in m/sec/sec or m/sec2
Formula is:
(final velocity - original velocity)/time

13. Deceleration vs. Acceleration
A decrease in velocity is deceleration or negative acceleration
A distance-time graph for acceleration is always a curve

14. Centripetal Acceleration
Acceleration directed toward the center of circular path

15. Questions What is acceleration?
What is the shape of a distance-time graph for acceleration?
What is centripetal acceleration?

16. Momentum
Momentum is equal to the mass of an object times its velocity
momentum= mass x velocity

17. Conserving Momentum
The law of conservation of momentum states that the total momentum is NOT lost, only transferred

18. Questions What is momentum?
What happens to momentum as the mass of a moving object increases?
What is the formula for momentum?
What is the law of conservation of momentum?