Chapter 2- Motion In A Circle Flashcards

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1
Q

Angular displacement def

A

Is the angle radians where

[] = arc length (s) / the radius (r)

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2
Q

Angular velocity

A

The AV of an object is its rate of change of angle, measured in radians/second

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3
Q

Angular velocity unit

A

Omega (w)

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4
Q

Explanation of angular velocity on a playground roundabout

A

Same angular velocity for everyone

But the further you stand away from the centre the faster you are travelling

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5
Q

Angular velocity eq for spinning on earth

A

w= 2pie / T

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6
Q

When something turns at a steady speaks what type of pull do you need?

A

A centripetal pull

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7
Q

Centripetal def

A

Means towards the centre of a circle

A force seeking the centre of the circle

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8
Q

Centrifugal def

A

Means away from the centre

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9
Q

Centripetal acceleration def

A

The radially inwards acceleration, perpendicular to the tangential velocity

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10
Q

Centripetal acceleration eq

A

CA = v^2 / r = r w^2

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11
Q

Investigating centripetal force method

A

Using a rubber bung in a thin string
Held at point if glass tubing with weight at other end
Rotated by person

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12
Q

Graph to calculate m in eq

F= mrw^2

A

Draw graph of F against rw^2

Line would go straight through origin
Gradient would be m (mass)

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13
Q

Resultant force eq

A

Fres = mv^2 / r

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14
Q

In situations where someone feels weightlessness they are actually…

A

Briefly in free fall (accelerating downwards at g= 9.8 m/s^2 )

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