## Pages

### 4. Data Analysis

4.1 Video motion Analysis using "tracker "

Paste screen captures here with the following graphs for
A) Displacement -time graph
B) Velocity -time graph
C) Acceleration - time graph

4.2 Data Analysis

1. Which wheels are your drive wheels ? ( front or back )

2. What is the circumference of your drive wheels ?

3. How Far will your car travel in one rotation of the drive wheels ? Show how you calculated this

4. How many rotations (on average ) were there in each run?

5. How much string is used in one rotation of the drive wheels ? Show how you calculated this .

6. The release of the lever is the power stroke . What is the length of the vehicles power stroke ?

7. Calculate how far your vehicle will travel during the power stroke ( show calculations )

8. Compare the answer to #7 to the distance your measured during your cars power stroke Discuss reasons for different values.

9.Calculate the average velocity of your car during the period after the spring releases .

10. What force causes your car to stop?

11. The work done by a force is calculated by multiplying the force timed the distance over which it acts . The work done on an object is equal to the change in its kinetic energy. Can you find a way to calculate the force of friction ? Use equations and explain your steps .

12. Various experiments have been done to measure the potential energy available from the spring . One estimate is 0.65 Joules . Using your estimate of the maximum kinetic energy of your car and the work done by friction , discuss whether or not this is a reasonable value . Can you account for any differences in the forms of energy ? You must