Openthe PhetsimulationCharges and Fieldfrom this link: (https://phet.colorado.edu/en/simulation/charges-and-fields).

In this simulation, a little different model is used: the little yellow "E field sensors" are like the hockey puck but they are on a high friction surface, so they stay in place allowing for measurements. Collect data by turning onShow Numbers&Tape Measure.

1. Explain how you can predict the motion of a charged hockey puck that is moved by other charged pucks. Explain using examples and drawings that include:

a. How to use free body diagrams and vector addition.

b. How negative and positive charges compare and contrast.

2. Explorethe relationship between energy and fields.

• An object is placed in a field and released. Explore with either simulation, your own drawing of field lines, or your every-day experience with masses in gravitational fields.

a. What energy changes are observable or measurable?

b. What does the conservation of energy principle imply about these energy changes?

3. Imagine that the field strength is doubled, for example by doubling the source charge or the mass of a planet. How does doubling the field strength affect the kinetic energy gained by an object placed in the field?