Circlur Motion

Question 1

Degrees to radians

Answer 1

Theta x pi/180

Question 2

Time period and frequency

Answer 2

Time taken for one full rotation unit *s)

The number of full rotations per second unit (Hz)

Question 3

Time period and frequency equation

Answer 3

T=1/f
F=1/t
T=2pir/v

Question 4

Angular velocity

Answer 4

W=d○/dt w=2pi/t w=2pif

V=wr

Question 5

Rpm to rads^-1

Answer 5

Rpm x2pi/60 =rads^-1

Question 6

Centripetal force

Answer 6

Net constant force which causes an object to move in a circular path. The force is: always directed to the centre and perpendicular to the velocity

Question 7

Centripetal equations

Answer 7

F=mv²/r a=v²/r

Question 8

In circular motion the linear velocity changes how can this be?

Answer 8

Velocity is a vector quautity and the maguitude remains the same, however the direction changes. The centripetal acceleration changes thedirection.

Question 9

why does the speed of an object in circular motion Not change?

Answer 9

The net force is directed perpendicular to the direction of motion (the velocity); This means that there is no work done by -this force and hence no change in speed.

W=fxcos○ and ○=90 so cos○ always equals 0 so work done =0