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Skateboarder

Skateboarder. The problem. ‘ A skateboarder on a horizontal surface can accelerate from rest just by moving the body, without touching external support. Investigate the parameters that affect the motion of a skateboard propelled by this method. ’. Conditions. A horizontal surface A skateboard

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Skateboarder

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  1. Skateboarder

  2. The problem ‘A skateboarder on a horizontal surface canaccelerate from rest just by moving the body, without touching external support. Investigate the parameters that affect the motion of a skateboard propelled by this method.’

  3. Conditions • A horizontal surface • A skateboard • A skateboarder

  4. Getting into move • A toy for children – the ‘moonwalker’

  5. Explanation • Ábra

  6. Determining factors • Way of driving: steering with 30 to 60 degrees; not too fast • Surface: e.g. tiles or parquet • Rolling friction: between floor&wheels and wheels&bearings • Driver: mass; motion

  7. Starting a skateboard →Gaining potential energy →Converting into kinetic energy • Raise it and turn • Put it back onto the floor • Push • Repeat on the other side →Getting into a circular motion → Accelerating

  8. Parameters – the surface μstatic μrolling must be the biggest

  9. Parts of a skateboard

  10. Forces acting on the wheels We raise and move the nose rightwards The wheels push the floor The floor exerts a reaction force on the wheel One component rotates the wheel The other component causes a circular motion

  11. Trucks, wheels, bearings

  12. Parameters – the skateboard • Deck: smaller the better • Trucks: loosely adjusted for better turning • Wheels: soft, 60-75 mm • Bearings: small friction

  13. Parameters – the skateboarder • Small mass • Low centre of gravity • Leaning towards the centre of motion • The human factors are not negligible

  14. The right positions

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