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Edexcel | Physics WPH0 | S 18 4 1 | 1 hour 30 minutes
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14
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The diagram shows an investigation of circular motion.

           

A small movement of the hand causes the rubber bung on the end of the string to move in a circular path of radius r. The rubber bung and the string may be assumed to rotate in a horizontal plane.

14
(a)
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3 Mark s

For a particular experiment, r is 59 cm.

Calculate the speed of the rubber bung.

mass of M = 250 g

mass of rubber bung = 80 g

 

                                                        Speed = .......................................................

14
(b)
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3 Mark s

The speed of the rubber bung is increased.

Explain why M now moves to a higher position.

14
(c)
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2 Mark s

In order to calculate the speed of the rubber bung, the time for one rotation must be determined.

Student A suggests the number of rotations in a fixed time should be counted.

Student B suggests measuring the time for a fixed number of rotations.

Explain which method will produce more accurate results for the time of one rotation.

 

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