- #1
adrienne
- 12
- 0
sth about centripetal force. pls help! ><
i got some problem about centripetal force. in this experiment, " http://www.smcc.edu.hk/phy/Experiments.files/Centripetal%20Force.doc "
my hand apply a horizontal force, to give the velocity 'ω' to the stopper thing. when i decompose ω into vectors, i got a centripetal force to the centre. but then the problem comes. i don't undrstand y Mg doesn't fall down. as the centripetal force (Tension) has a direction to centre and Mg is pointing downwards, y don't it fall?
is that becoz when there is a 'ω', there will be a centripetal force(T) with a magnitude, which hv a length 'r' (radius)? so when the bung is whirled, there will be a length 'r', which make Mg remain at the same level?
but then there'll be another problem... if Mg doesn't fall, according to Newton's 3rd law, there is another upward force. is that real?
i'm just thinking when the force applied is small, the deflected angle of the bung is large. is it becoz the centripetal force is small? if it is, the vertical component of the bung is then smaller! how can it keep 'mg' at the same level then?
pls help! ><
i got some problem about centripetal force. in this experiment, " http://www.smcc.edu.hk/phy/Experiments.files/Centripetal%20Force.doc "
my hand apply a horizontal force, to give the velocity 'ω' to the stopper thing. when i decompose ω into vectors, i got a centripetal force to the centre. but then the problem comes. i don't undrstand y Mg doesn't fall down. as the centripetal force (Tension) has a direction to centre and Mg is pointing downwards, y don't it fall?
is that becoz when there is a 'ω', there will be a centripetal force(T) with a magnitude, which hv a length 'r' (radius)? so when the bung is whirled, there will be a length 'r', which make Mg remain at the same level?
but then there'll be another problem... if Mg doesn't fall, according to Newton's 3rd law, there is another upward force. is that real?
i'm just thinking when the force applied is small, the deflected angle of the bung is large. is it becoz the centripetal force is small? if it is, the vertical component of the bung is then smaller! how can it keep 'mg' at the same level then?
pls help! ><