1. Vectors that lie in the same plane A. colllinear B. concurrent C. coplanar D. parallel 2. A single vector whose effect equals the sum of a system of vectors A. component B. resultant C. equilibriant D. torque 3. The weight of an object A. is the quantity of matter it contains B. is the same as mass but different in unit C. refers to its inertia D. is the force which it is attracted to the earth 4. A woman whose weight is 500 N is standing on a level ground. The force the ground exerts on her is A. less than 500 N B. equal to 500 N C. more than 500 N D. any of the above 5. When a surface exerts a normal force on an object, the force is A. equal to the object's weight B. frictional in origin C. parallel to the surface D. perpendicular to the surface6. A sheet of paper can be withdrawn from under a bottle of milk without toppling it if the paper is jerked out quickly. This is an example of A. inertia B. acceleration C. weight D. friction 7. An object in equilibrium may not have A. any forces acting on it B. any torque acting on it C. acceleration D. velocity 8. Two ropes are used to support a stationary weight W. The tensions in the ropes must A. each be equal to W B. each be equal to W/2 C. have a vector sum of magnitude W D. have a vector sum of magnitude W/2 9. When a horse pulls on a wagon, the force that causes the horse to move forward is the force A. he exerts on the wagon B. the wagon exerts on him C. he exerts on the ground D. the ground exerts on him 10. To set an object into motion on a surface usually requires A. less force than to keep it in motion B. more force than to keep it in motion C. the same force needed to keep it in motion D. as much force as needed to overcome inertia