7. In order for an object to move, what must happen to the forces around it? a) They must become unbalanced. b) They must oppose each other. c) They must stay the same. d) They must add up..
8. A book is at rest on the top of a table. According to Newton's first law of motion, what can you say about the forces acting on the book? a) The forces acting on the book are balanced. b) The forces acting on the book are imbalanced. c) The forces acting on the book are net external forces d) The forces acting on the book are gravity and air resistance. 9. Which of the following statements best describes how inertia affects an object? a) An object will remain in its state of motion unless acted upon by an outside force. b) An object in motion will stay in motion regardless of outside forces. c) An object at rest will gradually move regardless of outside forces. d) An object at rest will stay at rest regardless of the outside forces.​