Year 10 10 Sc Science
Acceleration 2009
YEAR 10 SCIENCE: TICKER TIMER PRACTICAL LESSON Period 3 Thursday, 22/10/09 (Line 1) 11.15 – 12.25
Objective: To use a ticker ti cker timer to measure and demonstrate both constant speed and acceleration. Equipment: Equipment: ticker timers (1per table table group), ticker tape (2 x 1 m lengths lengths each), power packs, AC connectors. Special needs: needs: To be identified. Two adults will be available to assist where necessary.
Intro: Intro: What are ticker timers used for? How do they work? work? How are they set up? What are we going to attempt to demonstrate?
Body: Body: With care and a friend assisting to minimise tangling of the tape, pull the first tape through the timer at a constant speed. speed. Pull only approximately 60 cm through, and on the remaining 30cm of tape, identify the speed at which the tape was pulled through (constant speed or acceleration) and the direction in which it was pulled. Repeat with the second piece, this time accelerating the speed at which the tape is being pulled through the machine. machine. Mark in the same way. way. Complete the worksheet.
Conclusion: Conclusion: What were we able to demonstrate? What may be the reasons reasons for a variation on the expected result?
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Year 10 10 Sc Science
Acceleration 2009
WORKSHEET: TICKER TIMER PRACTICAL.
AIM:
MATERIALS: Ticker timer, complete with carbon disc Ticker tape (2 x 1m lengths per student) AC power supply and connecting wires
METHOD: 1) Set up ticker ticker timer timer as per instruct instructions. ions. Measure Measure off off lengths lengths of tape. tape. 2) Start the timer timer and pull pull a piece of tape tape through through at a constant constant speed speed until 60 cm of tape has been pulled through. Label the tape and and indicate direction of movement. 3) Repeat Repeat step 2, this time time pull the the tape through through with increas increasing ing speed. speed. Label the the tape and indicate direction of movement. 4) Exam Examin ine e the the tape tapes: s: a) What can can be observed observed about about the spacing spacing of the dots dots on the different different tapes? tapes? b) What What is the differ differenc ence? e? 5) On each each tape, tape, select select a starting starting point. point. Count Count along along the tape tape from from the first first dot, dot, marking off every fifth dot. Five dots dots represent 0.1 second. second. (See text book, p 125 for diagram). Measure the the distances d 1, d 2 2, d 3, d 4 etc and record them in the data table below. CONSTANT SPEED
DISTANCE d1
d2
d3
d4
d5
d6
d7
d8
d9
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Year 10 10 Sc Science
Acceleration 2009
ACCELERATION
DISTANCE d1
d2
d3
d4
d5
d6
d7
d8
d9
6) Plot a distance distance versus versus time time graph for each each set of data data and draw a best-fit best-fit line. line. 7) Now cut tape along along each marked marked segment segment (0.1 second second interva intervals) ls) (5-6 pieces). pieces). For each tape, glue the segments alongside one another, creating a speed versus time graph. What do you observe? observe? Was the constant speed speed tape constant? Was the acceleration constant?
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Year 10 10 Sc Science
Acceleration 2009
Stannard, P & Williamson, K 2001, Science World 3, MacMillan Education, Australia, Melbourne
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