Not-That-Bright
Andrew Quah
The only problem I can see with the height is if it isn't high enough for the ball being thrown hits the ground too fast, but that wouldn't be anything you can call a 'cliff'.
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Objects thrown under free fall (2 Viewers)
- Thread starter rawker
- Start date
Mat_Aussie
Member
not-that-bright
do you agree with my answer?
do you agree with my answer?
Not-That-Bright
Andrew Quah
Well I don't think they have to reach terminal velocity.
Mat_Aussie
Member
but without height of the cliff, the mass of the balls, and the force or speed at which they are thrown.
i dont think that it is possible to work it out, is it?
i dont think that it is possible to work it out, is it?
Not-That-Bright
Andrew Quah
Well I think we can assume that the cliff is fairy high, that the balls were thrown at a relatively normal throwing speed (i.e. not shot like a bullet) and are of average ball mass.... but that doesn't really matter.
twilight1412
Member
the topic states freefall
BUT
in the question the person asked freefall is not mentioned
also i consider it illogical even by school standards for a situation to occur that involves freefall and a cliff
unless of course an elevator/car was pushed off and you were in it
BUT
in the question the person asked freefall is not mentioned
also i consider it illogical even by school standards for a situation to occur that involves freefall and a cliff
unless of course an elevator/car was pushed off and you were in it
ianc
physics is phun!
- Joined
- Nov 7, 2005
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- HSC
- 2006
everyone seems really confused here....
freefall (in the hsc sense of the word) is where the only force acting on an object is gravity - hence it is falling towards the earth.
The question does not need to specifically mention freefall - it is simply expected that at an hsc level you recognise that the only force acting on the object is gravity until it reaches the ground - so you apply the simple kinematics equations of v2 = u2 + 2as and v = u + at
do not worry about terminal velocites and all that for freefall (unless of course you're a 4unit maths student doing mechanics
)
hope this has helped!
freefall (in the hsc sense of the word) is where the only force acting on an object is gravity - hence it is falling towards the earth.
The question does not need to specifically mention freefall - it is simply expected that at an hsc level you recognise that the only force acting on the object is gravity until it reaches the ground - so you apply the simple kinematics equations of v2 = u2 + 2as and v = u + at
do not worry about terminal velocites and all that for freefall (unless of course you're a 4unit maths student doing mechanics
)hope this has helped!