Chapter 3 - Circular Motion Flashcards

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1
Q

Angle (radians) = ?

A

Arc length/radius

θ = s/r

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2
Q

Define one radian?

A

The angle subtended at the centre of a circle by an arc of equal length to the radius of the circle.

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3
Q

Define centripetal force?

A

The net force acting on an object moving in a circle; it is always directed towards the centre of the circle.

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4
Q

Centripetal force equation and centripetal acceleration equation?

A

F=(mv^2)/r

Since a=F/m

Centripetal acceleration, a?

a = (v^2)/r

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5
Q

How to calculate orbital speed?

A

Centripetal force = (mv^2)/r is provided by the Earths gravitational pull =mg.

Therefore:
(mv^2)/r = mg
So:

(v^2)/r = g

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6
Q

Define angular displacement?

A

The angle through which an object moves in a circle.

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