Posted by Tom on Wednesday, May 26, 2010 at 6:24pm.
A 6.9 kg bowling ball travelling at 6.4 m/s strikes a stationary 1.4 kg bowling pin. After the collision, the pin flies forward at 6.4 m/s.
How much kinetic energy was lost in the collision?

physics  drwls, Wednesday, May 26, 2010 at 7:03pm
There is something wrong with the assumptions of this problem. Collisions of bowling balls with pins are highly elastic. The kinetic energy of rotation of the bowling ball also should be considered. It changes very little.
A pin hit headon by a bowling ball will end up with a velocity a lot faster than that of the ball. If you don't believe it, go to a bowling alley.
They probably want you to assume conservation of momentum for the collision. This is OK, but the assumed velocity of the pin after collision is not.
6.9*6.4 = 6.9V' + 6.4*1.4
V2 (the final velocity of the ball) = 5.1 m/s
Use that velocity and what you already know to compute the KE loss they want to to compute. Warning: it will not be close to what would really happen.
Your teacher may be unaware of the importance of rotational KE, so assume it stays the same.
Answer This Question
Related Questions
 physics  a bolwing ball of mass 2.00 kg strikes a stationary pin of mass 5.00 x...
 Physics  In order to convert a tough split in bowling, it is necessary to ...
 physics  After being struck by a bowling ball, a 1.4kg bowling pin sliding to ...
 Physics  I've been stuck on this questions for 2 days A 7.2kg bowling ball ...
 physics  In order to convert a tough split in bowling, it is necessary to ...
 physics  Bailey is on the tenth frame of her recent bowling competition and she...
 physics  A 6kg bowling ball rolling at 5 m/s strikes a stationary 4kg bowling...
 Physics  A 4.0 kg bowling ball rolling at a velocity of 11m/s down the bowling ...
 physical science  A 6 kg bowling ball rolling at 5 m/s strikes a stationary 4 ...
 calculus  a bowling ball of mass 6.5 kg rolled with a velocity of 12m/s. The ...
More Related Questions