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    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



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    March 28, 2020

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