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# Physics Coursework-Bouncing ball ???? watch

1. In bouncing ball experiment, I measured time of contact with the ball and floor.

Using I=Ft=mv-mu equation

I can calculate how much force is exerted.

Question is ....

By knowing Force and time would I be able to calculate how much sound and heat is produced from collision between floor and ball ??

What equation shall I use ??

Could you suggest me any web site ???

Oh, and how can I measure gravity without using time and velocity..
my light gates doesnt seem to work at all.

Thanks
2. you guys have really dull coursework, no offence.
i couldnt tell you
im not sure what board you're with but i'll tell you only wat i know from my forces, fields exam we had in jan

Speed of ball b4 impact: PE = mgh ( 1/2 mv2 )
V2 = 2gh B = squareroot 2gh

and average force during impact for a contact of time F = mv/t

this probably wont help you whatsoever but whatever, if u want coursework for the specific heat capacity i'll give u myne

bye.
3. and to get gravity you can derive it from the 1st one
i know 0 sites
sorry
4. (Original post by DazYa)
you guys have really dull coursework, no offence.
i couldnt tell you
Its actually boucing ball on inclined plane.
well still piece of pi**. I admit.

its only 1/6 of my A2 course and i dont want to spend much time trying to understand, choosing interesting and hard coursework.

oh its Edexcel btw.

see ya
5. don't know whether they allow to use other method or not...

seem there are so many ways to measure gravity...

eg. using F=BIL is a goog way to find it without t & v.
6. & always accept the idea of conservation of energy

1/2mv^2 + energy lost = mgh

BTW: Is there any method can directly calculate the energy of sound ?
7. F = BIL only applies to electromagnetic conduction and the like i think, but i guess u cud try.. or fit equations into equations
8. and if u wanan get the gravity then u can do g = F/M which can also be as G Ms Me
---------
(Re + h )2 Ms

the Ms cancel out which gives
G Me
-------
(Re + h )2

G = constant
Me = mass of earth
h = height

g = G m / r2
9. (Original post by DazYa)
and if u wanan get the gravity then u can do g = F/M which can also be as G Ms Me
---------
(Re + h )2 Ms

the Ms cancel out which gives
G Me
-------
(Re + h )2

G = constant
Me = mass of earth
h = height

g = G m / r2
what a fun in using this formula to solve out the gravity...
a bit of error will cause you die in no doubt...
10. & I am not sure whether it is right to omit the smaller mass particle in this way...
11. yep so u can jst use Mass of ball, Radii of ball,then get ur answer dat way
there was a similar situation in the exam .....whereby you CAN use the equation and apply it to a ball cuz the ball is sstill a body
but yueah its not gonna be perfect :P
12. Not to forget the coefficient of friction. Ie when ball hits ground, it lioses energy.
and its a constant is "e"

ie. V1 = eV1

Where V1 is the speed at wich it falls on ground.

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Updated: February 12, 2004
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