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What I Know MULTIPLE CHOICE: Choose the correct answer among the options. 1. Which of the following is always true about net force? n. It causes motion b. Its SI unit is newton C. It makes the objects speed up d. It is inversely proportional to acceleration 2. The acceleration due to gravity of Earth is a. 9.80 m /s, downward b. 9,80 km /s, downward C. 9.80 m/s, downward d. 9.80 m/'s , downward 3. If your mass on Earth is 55kg, what is your mass on the moon? a. 55kg G 550 kg 55 N d 550 N 4. You are standing on a scale in an elevator, You notice that your weight is decreasing. What can you conclude? The elevator is_ a. Accelerating upward b. Moving at constant acceleration upward C. Accelerating downward d. Moving at constant acceleration downward 5. Which of the following statements is not one of Newton's Laws on motion? a. In the absence of an unbalanced force, an object moves at constant velocity b. For any force there is always an equal but opposite reaction force. C. The force and the acceleration of a body are towards the same direction. d. What goes up must come down. The seatbelt of your car protects you from your a. Acceleration c. mass b. Inertia d. velocity 7. Which of the following is not consistent with a car which is accelerating? a. Moving with an increasing speed b. Moving with a decreasing speed. Moving with a high speed d. Changing direction 8. Which of the following is not in equilibrium? a. A crate stationary on an incline b. A car climbing a hill at constant speed C. A car turning a comer at constant speed d. All examples show objects in equilibrium 9.' If the force of gravity on balloon is 3,000N, and the lift force provided by the atmosphere is 2 900N, in which direction is the net force acting? a Upward c. towards the east b. Downward d, there is no net force 10. If a horse pulls on a calesa at rest, the calesa pulls back equally as much on the horse Will the calesa be set into motion? a. No. because the forces cancel each other. b. Yes, because there is a net force acting on the calesa. c.Yes, because there is a time delay between action and reaction. d. Yes, because the horse's pull on the calesa is larger than the calesa's pull on the e. horse