1) Which force always pulls downward on objects? a) Support force b) Friction force c) Gravity d) Air resistance 2) A force is described as... a) A push only b) A pull only c) A push or a pull d) None of the above 3) A change to an objects motion is caused by... a) Balanced forces b) Unbalanced forces c) Acceleration d) Velocity 4) Describe the motion of a person not wearing a seat belt if the car stops suddenly. a) The person and car will stop together. b) The person will stop faster than the car because they are lighter. c) The car will stop and the person will keep moving forward because of inertia. d) The car will stop and the person will speed up. 5) A falling object is pulled down by the Earth. The Earth is pulled up toward the object. Why doesn’t the earth move? a) Only the earth has gravity. b) The Earth has a very large mass and a small acceleration. c) The Earth has a very small mass and a large acceleration. d) Air resistance gets in the way. 6) What forces are acting on a dropped book that falls to the floor? a) Gravity only b) Gravity and air resistance c) Air resistance d) Friction only 7) What unit do scientists use to measure force? a) Newton b) Grams c) Meters d) Meter per second 8) When you slide a box across the floor what force must your push be stronger than? a) Support force b) Friction force c) Gravity d) Air resistance 9) The moon has a smaller mass than the Earth. If you were able to travel to the moon your weight would... a) Increase b) Decrease c) Stay the same d) Vary with day and night 10) A paper is sitting at rest on your desk. Which of the following statements best describes this situation? a) There are no forces acting on your paper. b) Your paper pushes on the desk only. c) The desk pushes on your paper only. d) The forces acting on the paper are balanced.

Force and motion

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