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Making A Low Friction Balloon Air Puck S-5. Created for OP 3 October 2K+3. FORCES & MOTION IVA1 ROLLING ON AN INCLINED PLANE. Created for OP 26 April 2K+2. Materials: Inclined plane Free‑wheeling toy car Masking tape or chalk or movable place‑markers meter stick stop watch.

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## Making A Low Friction Balloon Air Puck S-5

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**Making A Low Friction Balloon Air PuckS-5**Created for OP 3 October 2K+3**FORCES & MOTIONIVA1ROLLING ON AN INCLINED PLANE**Created for OP 26 April 2K+2**Materials:**• Inclined plane • Free‑wheeling toy car • Masking tape or chalk or movable place‑markers • meter stick • stop watch**1. Adjust the inclined plane so it takes the car at least**three seconds to reach the bottom. Try for four or five seconds.**2. A timekeeper will call out seconds. Release the car at**the top of the incline at one of the seconds.**3. Every time the timekeeper calls out another second, mark**the incline to show where the car was at that second.**Measure the distance between the marks to find out how far**the ball rolled during each second. • Record your measurements in the data table below.**Distance (in cm) Car Traveled During One Second**• Trial 1st 2nd 3rd 4th 5th • 1 • 2 • 3 • Ave**5. Calculate the average velocity for each of the time**intervals. Use the average distance from above. (The elapsed time is always one second.)**Table of Results**• TimeIntervalAverage Velocity • (sec) (cm/sec) • 1st • 2nd • 3rd • 4th • 5th**6. What happened to the average velocity of the car as it**rolled down the incline?**7. How much did the average velocity change between the**first and second time interval?**8. How much did the average velocity change between the**second and third time interval?**9. How much did the average velocity change between the**third and fourth time interval (if you got this data)?**10. How much did the average velocity change between the**fourth and fifth time interval (if you got this data)?**11. Did the average velocity change by about the same amount**with every passing second? • Give the value.**12. Your answer to number 11 is called the rate of change of**velocity. • It is the change in velocity divided by the elapsed time.**Its units are the units of velocity divided by the unit of**Time • (usually meters per second divided by seconds or centimeters per second divided by seconds; • we would say "meters per second per second").**The rate of change of velocity is called the acceleration.**Use your answer to number 11 and write out, with units, the average acceleration of the car as it rolled down the incline.**13. When you set up the inclined plane, what do you think**the acceleration of the car would have been if the end of the incline had been lifted twice as high?**14. If the end of the incline had been lifted twice as high,**what would you predict for the average speed during each of the time intervals?**15. Repeat the experiment using twice the height for the**elevated end of the incline.**16. Discuss how well your new data matched your predictions.**Include comments about the efforts of some other teams.**17. For your first set of data, if the car could continue**accelerating on the same incline for 10 seconds, what would you predict for its average velocity during the tenth second?**The acceleration of gravity on Earth is 9.8 meters per**second per second. If a rock is dropped from a sufficient height, how fast will it be going after: • 1 sec___ 2 sec___ 3 sec___**Force and Motion4A3Classifying Motionp 69**Created for OP 26 April 2K+2**Predict**• Accelerated or not? • Not moving? • Speeding Up? • Constant speed, st. line? • Slowing down? • Changing Direction?**Cart and Accelerometer**• At Rest • Long Slow Push • Constant Speed • Slowing down**Repeat – Be More Aggressive**• Cart and Accelerometer • At Rest • Long Slow Push • Constant Speed • Slowing down**Repeat – Be More Aggressive**• What does the “trusty” accelerometer demonstrate? • How does it display the direction of acceleration?**Cart on Incline**• Going down the incline • Going up the incline • Going Up and Down incline**Cart on Incline**• What is the direction of the acceleration of a cart on a ramp? • a. Going down? • b. Going up? • c. At the top?**What is the “trusty” accelerometer telling us?**• a. To right, speeding up • b. To right, slow down • c. To right, constant speed • d. The repeat, to left? • e. At the top of ramp?**Cart on Incline**• 15.**Cart on Incline**• 16.**Cart on Incline**• 17.**Force and Motion4B1Acceleration InCircular Motion72**Created for OP 26 April 2K+2**Rotate on stool with “trusty” indicator perpendicular to**arm.**2. Rotate on stool with “trusty” indicator parallel to**arm with arm outstretched.**3. Rotate on stool with “trusty” indicator parallel to**arm but close to body.**4. When an object is moving in a circle at constant speed,**what is the direction of acceleration?**Does the acceleration depend on how far from the center it**is measured? • Demo: Multi-Accelerometer**6. What does “trusty” accelerometer say when it is**placed on top of ones head.**Force and Motion4B2Acceleration When Speed and Direction**Change75 Created for OP 26 April 2K+2

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