YEAR 2 - Practical 1 : Investigating Circular Motion Flashcards

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1
Q

Which formula are we using to measure the mass of a rubber bung?

A

F = mv^2/r

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2
Q

Equipment

A

Stopwatch
Clear use
Bung on strong
Slotted masses (up to 500g)

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3
Q

How is the bung rotated?

A

By holding the clear tube and the weight is held until it is balanced by the bung rotating

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4
Q

What ensures a constant radius?

A

A marker on the string

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5
Q

When is the stopwatch started?

A

When the bung passes a fixed marker relative to the experimenter

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6
Q

When does counting starts

A

As the stopwatch is pressed at zero

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7
Q

When is the stopwatch stopped?

A

At count 20 rotations

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8
Q

How much is the uncertainty reduced by doing 20 rotations instead of 1?

A

By a factor of 20

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9
Q

What is the range of weights and the increments in which they’re increased?

A

0.10kg to 0.50kg

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10
Q

How is T calculated?

A

By dividing T20 by 20 for each weight

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11
Q

Equation used to curate the velocity

A

V = 2pir/T

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12
Q

What type of graph is plotted and what gradient would this give?

A

F versus V^2
Gradient m/r

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13
Q

How is m calculated?

A

Gradient x r

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14
Q

How can we check our results?

A

Using a balance

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15
Q

When are the rotations slowest and why?

A

With lower weights as there’s a smaller force, therefore the rotations are slower

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