Pre-Lab: Electrical and Gravitational Potential Name: Section: 1. Write down the equation for the gravitational force between two point- masses m and my. Next write down the equation for the electrical force between two point-charges q1 and q2. 2. How are the gravitational and electrical forces the same? How are they different? Is the force between two like charges attractive or repulsive? How about the force between two like masses? How can you tell from the equations? 3. Calculate both the electrical and gravitational forces between the electron and proton in a Hydrogen atom. The masses and charges of the elec- tron and proton are me = 9.1 x 10 31 kg, mp = 1.7 x 10-27 kg, qe = -1.6 x 10-19 C, and 4p = +1.6 x 10 19 C, and their separation is r = 1.0 x 10 10 m. Which force, electrical or gravitational, is stronger? By how much? 4. Based on your answers to the previous question, is it surprising that a thrown baseball is primarily controlled by gravity, while the electrical force has no noticeable effect on the flight path? What must be true for this to be the case? Hint: What is the electrical charge of the Earth