SCIENCE 8 First Quarter – Quiz 1 Name: _________________________________________________ Score: _______________ I. MULTIPLE CHOICE. Encircle the letter of the correct answer. 1. Who formulated the Three Laws of Motion? A. Aristotle B. Isaac Newton C. Thomas Edison D. Alexander Graham Bell 2. Which has more mass, a kilogram of cotton or a kilogram of iron? A. iron C. cotton B. both have the same mass D. cannot be determined. 3. Which has the greatest inertia? A. airplane B. car C. jeepney D. bike 4. Which Newton's law explains when a man is pushed forward in the car as it stops? A. 1st law B. 2nd law C. 3rd law D. 2nd and 3rd laws 5. A boy jumps out of the boat into a dock. As the boy moves forward to the dock, the boat moves backward. Which statement describes this situation? A. An object at rest remains at rest. B. Friction opposes the motion of an object. C. For every action, there is an equal and opposite reaction. D. The net force is directly proportional to mass and inversely proportional to acceleration. 6. Which law of motion states that for every action, there is an equal and opposite reaction? A. Law of Inertia C. Law of Acceleration B. Law of Interaction D. Law of Gravitation 7. Which of the following is the unit of force? A. kg.m/s B. kg/m/s2 C. Newton D. Joule 8. If the same net force acts on an object, what happens to its acceleration as its mass increases? A. decreases B. increases C. stays the same D. cannot be determined 9. What will happen to a moving object if there are no external forces acting on it? A. It will stop immediately. C. It will go faster and faster. B. It will move with constant velocity. D. It will slow down and come to a stop. 10. Which of the following equations describe the 2nd law of motion? A. m = F x a B. W= F x d C. F= m x a D. P = W x t II. TRUE OR FALSE. Write TRUE if the statement is correct and write FALSE if the statement is wrong. __________________________11. Motion is the body’s change in position with respect to time. __________________________12. Inertia is the tendency of an object to resist any change in its state of rest or motion. __________________________13. The object with greater mass has lesser inertia. __________________________14. Acceleration also varies with the mass of the object. As the mass of the object increases, with the same amount of force applied, its acceleration decreases. __________________________15. In determining the action and reaction forces, be able to identify first the action that requires force, and then identify the reaction force that counteracts the action force. III. ACTION AND REACTION FORCES. Write the Action Force and Reaction Force in the given situation. Action Force Reaction Force 16 – 17. 18 – 19. (Trampoline) 20. IV. PROBLEM SOLVING. Using what you have learned in the Law of Motion, answer the following problem. Follow the G-E-S-A Method. 21 – 25. Find the acceleration of an object with 11 N and 1.2 kg. G– E– S– A– 26 – 30. A 950 kg car is traveling at an acceleration of 7.6 m/s2, East. Find the net force needed to accelerate the car. G– E– S– A– 31 – 35. An object accelerates 23.5 m/s2 when a force of 9.6 N is applied to it. What is the mass of the object? G– E– S– A–
