Circular motion Flashcards Preview

Physics ALevel OCR > Circular motion > Flashcards

Flashcards in Circular motion Deck (16)
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1
Q

equation for angular velocity with T

A

w=2pi/T T=time period to move in a full circle

2
Q

equation for angular velocity with f

A

w=2pif unit rads-^-1

3
Q

what is a centripetal force

A

a force that keeps a body moving at a uniform speed on a circular path. gravitational attraction is the centripetal force for the earth and sun

4
Q

how can you find linear velocity of circular motion

A

linear velocity is always at a tangent to the circular path

v=2pir/T v=rw

5
Q

in what direction does centripetal acceleration act?

A

towards the centre of the circle

6
Q

equation for centripetal acceleration circular motion

A

a=rw^2

7
Q

equation for centripetal force circular motion

A

F=mrw^2

8
Q

SHM acceleration equation

A

a= -w^2

9
Q

velocity in SHM

A

v= +/- w (A^2 - x^2 )^1/2

10
Q

vmax in SHM

A

vmax=wA

11
Q

displacement (x) in SHM from equilibrium

A

Acoswt (if it starts from a positive amplitude) or Asinwt (if it starts from the equilibrium point)

12
Q

key features of objects moving SHM

A
  • acceleration of the object is directly proportional to its displacement
  • the minus sign shows acceleration of the object is in the opposite to the displacement
  • time period is independent of the amplitude
13
Q

what is an isochronous oscillator

A

an oscillator that has the same period regardless of amplitude. aka in SHM

14
Q

graph of displacement against time for SHM

A

cos graph

15
Q

graph of acceleration against time for SHM

A

upside down cos graph

16
Q

graph of velocity against time for SHM

A

upside down sin graph