SECTION 1 FORMATIVE ASSESSMENT Reviewing Main Ideas 1. List three examples of each of the following: a. a force causing an object to start moving b. a force causing an object to stop moving c. a force causing an object to change its direction of motion 2. Give two examples of field forces described in this section and two examples of contact forces you observe in everyday life. Explain why you think that these are forces. 3. What is the SI unit of force? What is this unit equivalent to in terms of fundamental units? 4. Why is force a vector quantity? 5. Draw a free-body diagram of a football being kicked. Assume that the only forces acting on the ball are the force due to gravity and the force exerted by the kicker. Interpreting Graphics 6. Study the force diagram on the right. Redraw the diagram, and label each vector arrow with a description of the force. In each description, include the object exerting the force and the object on which the force is acting