Tuesday

March 31, 2015

March 31, 2015

Posted by **CONFUSED!!!!** on Tuesday, October 2, 2007 at 8:34pm.

Assuming the ball is alyways thrown with the same initial speed, at what angle should the ball be thrown in order to go the same distance D with one bounce (lower path) as one thrown upward at angle 47.8 with no bounce (upper path?)

the only hint my teacher gave me was: solve this problem symbolically before you plug in numbers.

i dont even know where to start.

- Physics -
**bobpursley**, Tuesday, October 2, 2007 at 8:49pmSymbolically:

Throw a ball up vertically, it stays in the air a long time, but doesn't go far. The energy of the throw concentrated the speed vertically, where it did little horizontal movement.

So when one angles a ball upwards, it is in the air longer, but that means the horizontal velocity is lower.

To get to a distance D, horizontal velocity needs to be maximum. So ignorign friction, the ball thrown horizontally is the way to go, letting it bounce/roll (neglicting friction). But friction is real, so with each bounce one looses energy.

So the question is, loosing 3/4 energy on one bounce (velocity is 1/2 before bounce), is it still a better deal to let it bounce to get the ball there faster.

Look at time to plate, which is determined by horzontal velocity .

- Physics -
**Anonymous**, Friday, December 28, 2007 at 3:05pmi don't know

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