Please help me with my physics homework and make it as detailed as possible!!

6. Explain one difference and one similarity between electric force and the force of gravity. 7. A charge is moved from one point to another in an electric field. Explain briefly the relationship between electric potential difference and work done in moving this charge. Select, and carefully complete,eight of the following questions. 1. Is it possible to ever have a situation where an object is accelerating and has a velocity of zero? Explain. 2. An object rests on a ramp. As the high end of the ramp is raised further, the angle of inclination increases causing the object to start moving. With the help of a free-body diagram, explain why this happens. 3. Why does \"centripetal force\" not appear on free-body diagrams? 4. A ball is dropped, bouncing on the floor. Would the collision between the ball and the floor be elastic or inelastic? What physical observations would lead to this conclusion? 5. Is it possible that the net kinetic energy for two objects be non-zero while the net momentum is zero? Explain