# SC PHYS 201 - Review for Exam 3 (3 pages)

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## Review for Exam 3

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- Lecture number:
- 22
- Pages:
- 3
- Type:
- Lecture Note
- School:
- University Of South Carolina-Columbia
- Course:
- Phys 201 - General Physics I
- Edition:
- 1

**Unformatted text preview: **

Phys 201 1nd Edition Lecture 22 Outline of Last Lecture I Angular momentum and rotational kinetic energy Outline of Current Lecture II Review A Power B Impulse C Momentum D Gravitational Potential Energy E Torque F Rotational Kinetic Energy Current Lecture Power Power describes the speed at which work is done Power can be described calculated from the following equations P W t P F X t P FV Where W represents work t represents time x represents distance and V represent velocity Because power is energy over time the unit for power is J s which are also called Watts Most objects can only put out a limited amount of power This means that if a person continues to increase the force they are applying to something they will have to adjust their speed in order to stay within the parameters of their available power e g when riding a bike up a hill you have to pedal slower when you use more work to keep moving up Impulse The impulse helps relate actual force of a system to the average force The most common example of an impulse is in the case of a collision in which an equal and opposite force is experienced for a certain amount of time causing the momentum of the object to change This force in this amount of time experienced is the impulse and it is equal to the momentum of the object Conservation of Momentum These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Momentum is used to describe a change in motion of an object The momentum p of a force is calculated by multiplying mass by velocity where momentum and velocity are both vectors If two objects collide with one another and the momentum lost by one object will be equal to the momentum gained by the other object then there is no change in in the momentum over time meaning that the final and initial momentums are the same This is called conservative momentum For objects with the same momentum the object with the fastest

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