# Anyone done centripetal force equations yet? Really confused?

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Thread starter 1 year ago
#1
Hi all,

The question is An object of mass 0.15 kg moves around a circular path of radius 0.42 m at a steady rate once every 5.0 s

Calculate:

A)The speed and acceleration of the object

B) The centripetal force on the object

Now I am guessing I need to work out the angular velocity first then work out speed? But no real clue?

Any help is greatly appreciated
1
1 year ago
#2
(Original post by Lambert87)
Hi all,

The question is An object of mass 0.15 kg moves around a circular path of radius 0.42 m at a steady rate once every 5.0 s

Calculate:

A)The speed and acceleration of the object

B) The centripetal force on the object

Now I am guessing I need to work out the angular velocity first then work out speed? But no real clue?

Any help is greatly appreciated
Are you familiar with the circular motion equations at all?
0
Thread starter 1 year ago
#3
(Original post by Protostar)
Are you familiar with the circular motion equations at all?
Familiar with

C = 2 pi r

v = 2 pi r/ T

Angular speed equations

Is this enough?
0
1 year ago
#4
(Original post by Lambert87)
Familiar with

C = 2 pi r

v = 2 pi r/ T

Angular speed equations

Is this enough?
It’s enough for the first part of the first question but I think that’s all

So looking back at what the question says, what components have you been given? Can you substitute these into any of the equations you know to work out speed?
1
1 year ago
#5
(Original post by Lambert87)
Familiar with

C = 2 pi r

v = 2 pi r/ T

Angular speed equations

Is this enough?
Yeah that's for linear velocity ...there's a bit more...
Centripetal acceleration = (v^2 )/r
Centripetal force = m * (the above acceleration)

Spoiler:
Show
You can do this!
1
1 year ago
#6
(Original post by Protostar)
Are you familiar with the circular motion equations at all?
Rofl... no. He was obviously either asleep or absent. Maybe he wandered in from the English Lit building by mistake and was given the wrong homework. Shall I compare this to... wtf??
1
1 year ago
#7
(Original post by Lambert87)
Hi all,

The question is An object of mass 0.15 kg moves around a circular path of radius 0.42 m at a steady rate once every 5.0 s

Calculate:

A)The speed and acceleration of the object

B) The centripetal force on the object

Now I am guessing I need to work out the angular velocity first then work out speed? But no real clue?

Any help is greatly appreciated
linear velocity = angular velocity x radius is a helpful one
0
Thread starter 1 year ago
#8
(Original post by Vinny C)
Rofl... no. He was obviously either asleep or absent. Maybe he wandered in from the English Lit building by mistake and was given the wrong homework. Shall I compare this to... wtf??
Absent
1
1 year ago
#9
(Original post by Lambert87)
Absent
0
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