PHYS 1110/2010 Midterm 2 Study Guide

Quick recap of Force Problems


  1. Write down knowns + unknowns

  2. Draw a picture

  3. Choose a coordinate system + Usually x is horizontal, y is vertical + For ramps choose x to be down the ramp and y to be perpendicular to the ramp

  4. Draw a free body diagram!!

  5. Write down sum of forces from tree body diagram


6. Is the acceleration in the x or y direction 0?

7. Use force equations to solve for unknowns!


Work + Energy


Work-Energy Theorem:


"Work done equals change in kinetic energy"


How to calculate work done by forces:

Work done on an object in circular motion is always zero!


Conservation of Energy:


“Energy in the beginning equals energy in the end”


If there’s kinetic and potential at the beginning and only kinetic at the end, then:


Just an example, it won’t always look like this


Power


Gravity


Force of gravity


If we cross out the little m’s, we get the gravitational acceleration on a planet:

Momentum


Momentum is ALWAYS conserved!!!


(The lines on the top just mean that they're vectors)


Momentum of one object is


+ Notice that momentum is a vector that points in the same direction as velocity


+ If you want to add two momentums, you have to do vector addition



Penji Team

December 27th

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