PHY221 Ch10: Center of Mass

1. Recall main points:

= =

2. Discussion and examples• If =0, CM moves at constant velocity• Explosion of a projectile in flight (free fall)• Example of computation CM for three particles

PHY221 Ch10: Center of Mass1.

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𝑀 �⃗�𝐶𝑀= �⃗� 𝑁𝑒𝑡 𝐸𝑥𝑡𝑒𝑟𝑛𝑎𝑙𝑀=∑𝑚𝑖Proof:

PHY221 Ch10: Center of Mass2.

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Problem: Fnet=0 problems

PHY221 Ch10: Center of Mass2.

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Problem: Projectile explodes in mid-air. What is the trajectory of CM?

PHY221 Ch10: Center of Mass2.

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Problem: Compute CM for three particles

PHY221 Ch10: Center of Mass2.

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CM of CM

PHY221 Ch10: Center of Mass2.

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CM continuous distribution

PHY221 Ch10: Center of MassQue

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PHY221 Ch10: Center of MassQue

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