Which of the following scenarios demonstrate the conservation of either linear o

Question

Which of the following scenarios demonstrate the conservation of either linear or angular momentum?

1.A parent pushes a merry-go-round and, consequently, it spins faster.
2.From opposite sides of a room, two identical balls of putty move toward each other, without friction, at the same velocity and, eventually, they collide; the result is one ball of putty with zero velocity.
3.A penny is dropped from the top of a building and its velocity increases as it falls due to the acceleration from gravity.
4.An ice skater tucks in her arms during a spin and her angular velocity increases.

Explanation / Answer

1. No. [no check mark]

The parent is imparting an impulsive force on the merry-go-round, causing an increase in angular velocity. Momentum is not conserved when impulsive forces are acting on the system.

2. Yes. [check mark]

3. No. [no check mark]

4. Yes [check mark]

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