Circular motion

Question 1

equation for angular velocity with T

Answer 1

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

Question 2

equation for angular velocity with f

Answer 2

w=2pif unit rads-^-1

Question 3

what is a centripetal force

Answer 3

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

Question 4

how can you find linear velocity of circular motion

Answer 4

linear velocity is always at a tangent to the circular path

v=2pir/T v=rw

Question 5

in what direction does centripetal acceleration act?

Answer 5

towards the centre of the circle

Question 6

equation for centripetal acceleration circular motion

Answer 6

a=rw^2

Question 7

equation for centripetal force circular motion

Answer 7

F=mrw^2

Question 8

SHM acceleration equation

Answer 8

a= -w^2

Question 9

velocity in SHM

Answer 9

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

Question 10

vmax in SHM

Answer 10

vmax=wA

Question 11

displacement (x) in SHM from equilibrium

Answer 11

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

Question 12

key features of objects moving SHM

Answer 12

• 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

Question 13

what is an isochronous oscillator

Answer 13

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

Question 14

graph of displacement against time for SHM

Answer 14

cos graph

Question 15

graph of acceleration against time for SHM

Answer 15

upside down cos graph

Question 16

graph of velocity against time for SHM

Answer 16

upside down sin graph