4.3.1.P11
For the following situations, indicate whether for the indicated system over the time interval stated whether:
- momentum is conserved
- momentum is not conserved
- there is not enough information give to decide
| 1. Suppose an O atom traveling with a speed of 200 m/s collides with a stationary O2 molecule and they bind into an ozone (O3) molecule. Gravity can be ignored for the time interval considered as can the presence of other neighboring molecules |
System: O atom and O2 molecule collide and become an O3 molecule.
Time interval: from just before collision to just after.
|
| 2. A perfectly elastic superball is attached to a metal rod that can pivot around the top of a ringstand. When the ball is released from the position shown, it falls, pivoting down until it collides with the block and bounces off. Air resistance and bending of the rod can be ignored. Only the horizontal momentum is considered. |
System: Superball and block
Time interval: From just after the ball is released until
just before it hits the block.
|
| 3. Same as 2. |
System: Superball and block
Time interval: From just before the ball hits the block until just after. |
| 4. Three carts move without friction on an air track. (Only part of the track is shown. It’s actually much longer.) They are connected by springs whose mass can be ignored and have negligible internal friction. Carts 2 and 3 are held fixed, cart 1 is pulled to the left and all three carts are released at the same time |
System: The 3 carts and 2 springs.
Time interval: From just after the carts are released until just before the first cart hits the bumper at the end of the track.
|
| 5. Same as 4. |
System: Carts 2 and 3 and spring H. Time interval: From just after the carts are released until just before one cart hits the
bumper at the end of the track. |
Joe Redish 12/2/16
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