20. Video

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| '''Finding Unknown Masses'''
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| '''Discs on a Turn Table'''
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| [[Image:masses.JPG]]
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| [[Image:Discs1.JPG]]
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| valign="top"| In this experiment the masses of two rocks can be determined by using the idea of forces in equilibrium. The data is collected and then you are required to do the calculations to find the masses.
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| valign="top"| Here four discs are placed on a turntable. The turntable starts to rotate and its angular speed is gradually increased. Explain why the discs begin to slide in the order shown in the clip.
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http://www.youtube.com/watch?v=uUYJD2EAcdw
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http://www.youtube.com/watch?v=Oa9SD2sqgXQ
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| '''Angle of Friction Experiment'''
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| '''Discs of Different Masses on the Turn Table'''
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| [[Image:friction1.jpg]]
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| [[Image:Discs2.jpg]]
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|valign="top"| The coefficient of friction for a body on an inclined plane can be found by looking for the angle at which the body is on the point of sliding down the slope. This experiment shows how the coefficient of friction between a calculator and a wooden plane can be found.
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|valign="top"| If two discs of different masses are placed at the same distance from the centre of the turntable, why if either will begin to slide first? Make your prediction before watching the clip.
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http://www.youtube.com/watch?v=S9I2uaHKgD4
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http://www.youtube.com/watch?v=3V6EhZY_dKo
 
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| '''Angle of Friction Second Experiment '''
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| '''Finding the Coefficient of Friction between the coin and the Turn Table '''
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| [[Image:friction2.jpg]]
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| [[Image:coin.jpg]]
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|valign="top"| Here the coefficient of friction between a block and a plane is determined and then tested by using the angle of friction.
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|valign="top"| Use the data that you can gain from the experiment shown in the clip to calculate the coefficient of friction between the disc and the turntable.
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http://www.youtube.com/watch?v=z2q_Wymu0W4
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http://www.youtube.com/watch?v=gsXwqY6PGzY
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Current revision

       Theory          Exercises          Video      


Discs on a Turn Table
Image:Discs1.JPG Here four discs are placed on a turntable. The turntable starts to rotate and its angular speed is gradually increased. Explain why the discs begin to slide in the order shown in the clip.

http://www.youtube.com/watch?v=Oa9SD2sqgXQ


Discs of Different Masses on the Turn Table
Image:Discs2.jpg If two discs of different masses are placed at the same distance from the centre of the turntable, why if either will begin to slide first? Make your prediction before watching the clip.

http://www.youtube.com/watch?v=S9I2uaHKgD4


Finding the Coefficient of Friction between the coin and the Turn Table
Image:coin.jpg Use the data that you can gain from the experiment shown in the clip to calculate the coefficient of friction between the disc and the turntable.

http://www.youtube.com/watch?v=gsXwqY6PGzY

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