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Category: Physics 12

Electrostatics: Electric Charge + Electrostatic Force

Electrostatics: Electric Charge + Electrostatic Force

This video is only 10 minutes but EXTREMELY dense. Consider playing it at 0.75X speed and pausing frequently to take notes. That’s right – you are taking notes on these videos, right?

And a demonstration of a single force calculation using Coulomb’s law, with some explanation of the equation.… read more

Practice Test Answers

Practice Test Answers

Written response:
Circular Motion:
1. 1600 N
2. 7.7 rpm
3. coefficient when “just about to slip” = 0.61, so mu = 0.82 is fine
4. 11 N
Gravitation:
5. 9.2 hours
6. 3.3E8 m/s (note this is faster than the speed of light – no escape!)
7.… read more

Circular Motion: Sample Problems

Circular Motion: Sample Problems

A short simple one: max speed a car can take around a curve:

Note that when circles are oriented vertically, you have to consider gravity in addition to centripetal force. At the top of the circle it helps it, at the bottom it opposes it.… read more

Momentum Test Review

Momentum Test Review

The test is on Monday. For review, complete the practice test and check your answers:

Multiple choice:

  1. A
  2. B
  3. C
  4. B
  5. B
  6. D
  7. B
  8. C
  9. B
  10. B

Written response:

  1. 6.6 m/s at 20.4 degrees N of E (according to diagram with up being N – this is called “S of W” in the problem)
  2. 80N
  3. 91000 Ns upwards
  4. 211 m/s to the right
  5. 390 m/s at 70 degrees S of W

Written solutions for the written response questions here: