1. Electric forces and gravitational forces have many similarities. This prelab will examine the properties of Earth's gravitational field, so that you can transfer some of your knowledge about the familiar gravitational forces to electrical forces. Suppose that an object A of mass m is in freefall near Earth's surface. Draw a free body diagram for object A. What is the magnitude and direction of the gravitational force on object A? 2. If object A's mass is doubled, what happens to the direction of the force? The magnitude of the force? 3. We can define the gravitational field as the gravitational force per mass of object A. GF=F m In this equation, GF is the gravitational field, F is the gravitational force on object A, and m is the mass of object A. The gravitational field is a vector. What is the direction of the gravitational field? 4. Calculate the magnitude of the gravitational field acting on object A. Also calculate the magnitude of the gravitational field if the mass of object A is doubled. Is the gravitational field larger, smaller, or the same when the mass of object A changes? 5. If the mass of the Earth was doubled, what would happen to the force on object A? What would happen to the gravitational field acting on object A?