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Physics A-Level > Circular Motion > Flashcards

Circular Motion Flashcards

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1
Q

equation for angle in radians

A

ang in rad = arc length/radius

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2
Q

equation linking ω, time and deg

A

ω = deg/time

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3
Q

equation linking ω and freq

A

ω = 2πf

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4
Q

Centripetal force

A

Any force that keeps a body moving along a circular path with a constant speed

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5
Q

What is always true for a Centripetal force?

A

Always perpendicular to the velocity of an object

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6
Q

Time period in circular motion

A

time, in seconds, taken for an object to travel a full circle

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7
Q

Equation for speed in circular motion

A

v=(2πr)/T=rω

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8
Q

What is always true for centripetal acceleration?

A

Always acts towards the center of the circular path

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9
Q

Centripetal acceleration

A

Acceleration of any object travelling in a circular path at a constant speed

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10
Q

Centripetal acceleration equation

A

a= v^2/r = ω^2/r

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11
Q

Equation for centripetal force

A

F=(mv^2)/r = F=mω^2r

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12
Q

How much work is done by an object moving in a circle? Why?

A

0, WD=F*D in the direction of the force

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13
Q

Explain why the speed of an object remains constant even though there is a resultant force F towards the center of the circle

A

Resultant force (F) acts at 90deg to the velocity of the object → no work is done by F → no acceleration IN THE DIRECTION OF THE MOTION

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14
Q

Describe how values of F and v are obtained in the rotating bung expt (5)

A
  1. Student TRIES to rotate bung at CONSTANT radius
  2. Force F is calculated using F = Mg. where M is mass of slotted masses
  3. Measure time t for n revolutions of the bung (hence calculate T for 1 revolution).
  4. Measure radius r when STATIONARY
  5. Calculate v using (2πrn) /t or (2πr)/T
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15
Q

How to determine mass of an object (circular motion) from F-v^2 graph

A

Gradient m/r → * by radius

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16
Q

Newton’s first law of motion

A

A body will remain at rest or continue to move with constant VELOCITY unless acted upon by a force

17
Q

At which point on a vertical circle does a pilot of a plane experience weightlessness

A

At top of the circle

when the weight provides/equals the required centripetal force

18
Q

Equation for ω linking time period

A

ω = (2π)/T

Physics A-Level (10 decks)

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