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1.1

Minor Versionm

by Kailash NR

Introduction

Ring magnets behave fascinatingly when inserted into any metal rod that is magnetic. Here, we use a cycle spoke as the rod and notice the wonderful behaviour of the magnets as they spin down the spoke! This causes vibrations at the bottom of the spoke, where a cardboard spinner spins rapidly as the magnets descend!

Video Overview

    • Be mindful of sharp edges of the spoke.

    • Handle scissors with care

  1. Take a long cycle spoke . Pass the  bead through the cycle spoke's screw end and have it on the other end. The bead acts as a support for the Spinner/fan so that it does not slip through the cycle spoke.
    • Take a long cycle spoke .

    • Pass the bead through the cycle spoke's screw end and have it on the other end.

    • The bead acts as a support for the Spinner/fan so that it does not slip through the cycle spoke.

    • Make a spinner/fan ( circular, rectangular or star shaped) out of card board sheet and insert it into the spoke.

    • Make a hole at the middle of spinner using a paper punch.

  2. Place two magnets over each other Pass the magnets through the screw end of the spoke and leave them near that end
    • Place two magnets over each other

    • Pass the magnets through the screw end of the spoke and leave them near that end

  3. Pass the magnet through the screw end of the spoke and leave it near that end. With the screw end at the top, hold the spoke vertically and give the magnet enough of a twirl so that it can start moving down the spoke.
    • Pass the magnet through the screw end of the spoke and leave it near that end.

    • With the screw end at the top, hold the spoke vertically and give the magnet enough of a twirl so that it can start moving down the spoke.

  4. Measure the time taken by the magnet to reach the bottom of the spoke using a stopwatch. You can use the Stopwatch on your watch or app on your mobile phone.
    • Measure the time taken by the magnet to reach the bottom of the spoke using a stopwatch.

    • You can use the Stopwatch on your watch or app on your mobile phone.

    • Seek assistance for measuring time, if necessary.

    • Conduct 3 separate trials and write down their respective time periods on a piece of paper.

  5. Place two magnets over each other. Pass the magnets through the screw end of the spoke and leave them near that end. With the screw end at the top, hold the spoke vertically and give the magnets enough of a twirl so that they can start moving down the spoke.
    • Place two magnets over each other.

    • Pass the magnets through the screw end of the spoke and leave them near that end.

    • With the screw end at the top, hold the spoke vertically and give the magnets enough of a twirl so that they can start moving down the spoke.

  6. Measure the length of the spoke from base to the screw grooves. This is the distance travelled by the magnets on the spoke. The formula for calculating speed is Distance travelled/Time taken.
    • Measure the length of the spoke from base to the screw grooves.

    • This is the distance travelled by the magnets on the spoke.

    • The formula for calculating speed is Distance travelled/Time taken.

    • Calculate the mean of five trials for all the cases separately by formula (Trial 1 + Trial 2 + Trial 3+....+ Trial 5) / 5.

    • Now calculate the speed of magnets for all the cases using mean values.

  7. With the screw end at the top, hold the spoke vertically and give the magnets enough of a twirl so that they can start moving down the spoke The fan should start to spin as the magnet moves down the spoke
    • With the screw end at the top, hold the spoke vertically and give the magnets enough of a twirl so that they can start moving down the spoke

    • The fan should start to spin as the magnet moves down the spoke

    • The hole in the fan is either too small or too big.

    • The hole in the fan is not centred

    • The inside surface of the magnet(s) are too rough, hence preventing the magnets from spinning.

    • The fan is too big/unbalanced, thereby preventing itself from spinning.

    • The shape of the fan/spinner is asymmetrical

    • If magnets stopped in the middle of a trial, go for a fresh trial.

    • Do not tilt the spoke in the middle of a trial.

    • If time measurement readings are erratic, feel free to go for more trials until your timings are more consistent

  8. At what length of the spoke does the fan start spinning ?
    • At what length of the spoke does the fan start spinning ?

    • Can you increase the speed of rotation? How?

    • Can you change the direction of rotation? How?

    • What happens when you change the number of magnets? Experiment!

    • What happens to the colours on the disc when it spins ? Why does it happen ?

    • Make spinner/fan of different sizes and observe if the spin differs in each case.

  9. Variation 1 : Differentiate between magnetic and non magnetic substances by making a 'Hybrid Spoke'. Variation 2 : See the interplay of magnetism and gravity when we make a 'Mystery Rod'.
    • Variation 1 : Differentiate between magnetic and non magnetic substances by making a 'Hybrid Spoke'.

    • Variation 2 : See the interplay of magnetism and gravity when we make a 'Mystery Rod'.

    • To learn and make these variations refer 'Variation guide'.

Finish Line

Attached Documents

Vishal Bhatt

Member since: 04/26/2017

2,725 Reputation

78 Guides authored

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