Question: Conservation of Charge

Answer: The net charge in a circuit never changes unless a path leads away form the circuit for the charge to flow through

Question: Kirchhoff’s Junction Rule

Answer: The sum of the currents in branches of a parallel circuit is equal to the current leaving the parallel circuit

Supports conservation of charge by a change in charge in one of the branches corresponds to a change in charge leaving the parallel circuit

Question: What are three ways that net work being applied to a system can be determined?

Answer: 1. Final kinetic energy minus initial kinetic energy

2. Net force time distance

3. Find the individual forces being applied to all objects in a system and calculate work for each object. Add up the individual works to get net work

Question: What is the rotational inertia for a point mass?

Answer: I = MR^2

Question: What is the rotational inertia for a uniform disc?

Answer: I = (1/2)MR^2

Question: Is kinetic energy a vector or a scalar?

Answer: Scalar

Question: What applicant-recipient force pair is responsible for a swimmer propelling himself against the water with his arms?

Answer: The force of the surrounding water on the swimmer’s arms

This is a Newton’s 3rd Law Pair

Question: What is the best strategy for line of best fit problems asking to find error?

Answer: Make two more best fit lines: one with a slope just higher than the original but still going through a loot of data points and one with negative slope.

Question: What is never considered in a collision?

Answer: Velocity

Question: If a problem says that kinetic energy is conserved for a particular collision even though the collision isn’t explicitly stated as elastic, is the problem correct?

Answer: No, kinetic energy is only conserved in elastic collisions