# Centripetal Force

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#1
I really dont understand the answer to number 9c iii) on this pastpaper.

I thought the centripetal force is what keeps you in circular motion, and hence kept on the surface. The answer seems to suggest the centripetal force is what would make you fly off the surface, even though the force is what makes you accelerate toward the centre of the circle (asteroid)... I have no idea what the wieight force has got to do with it

Could someone explain please: QP and MS (Paper 2863) attached below: Cheers in advance

https://as-a2-physics.wikispaces.com...0June%20QP.pdf

https://as-a2-physics.wikispaces.com...0June%20MS.pdf
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#2
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5 years ago
#3
(Original post by newblood)
I really dont understand the answer to number 9c iii) on this pastpaper.

I thought the centripetal force is what keeps you in circular motion, and hence kept on the surface. The answer seems to suggest the centripetal force is what would make you fly off the surface, even though the force is what makes you accelerate toward the centre of the circle (asteroid)... I have no idea what the wieight force has got to do with it

Could someone explain please: QP and MS (Paper 2863) attached below: Cheers in advance

https://as-a2-physics.wikispaces.com...0June%20QP.pdf

https://as-a2-physics.wikispaces.com...0June%20MS.pdf
let N be the normal reaction felt by the car on the surface.

mg-N = m omega^2 r
N > 0 thus mg > momega^2r
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#4
(Original post by Zenarthra)
let N be the normal reaction felt by the car on the surface.

mg-N = m omega^2 r
N > 0 thus mg > momega^2r
Oh i see thanks!
1
5 years ago
#5
(Original post by newblood)
I really dont understand the answer to number 9c iii) on this pastpaper. I thought the centripetal force is what keeps you in circular motion, and hence kept on the surface. The answer seems to suggest the centripetal force is what would make you fly off the surface, even though the force is what makes you accelerate toward the centre of the circle (asteroid)... I have no idea what the wieight force has got to do with it Could someone explain please: QP and MS (Paper 2863) attached below: Cheers in advance https://as-a2-physics.wikispaces.com...0June%20QP.pdf https://as-a2-physics.wikispaces.com...0June%20MS.pdf
the cpf is what is required to perform the circular motion, which is the sum of the weight and reaction from the surface.
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