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