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Physical Science in Action Forces 1. A force is defined as a push or pull on an object that causes a change in its motion. a. true b. false 2. When opposing forces push and pull equally on an object resulting in no change in motion it is a(n) __________. a. balanced force b. friction c. attraction 3. What is the force that opposes movement between two objects in contact with each other? a. balance b. friction c. repulsion 4. __________ is the push or pull force caused by electricity and magnetic fields. a. Balanced force b. Electromagnetic force c. Nuclear force 5. What is the strongest force known to mankind? a. electromagnetic force b. repulsion c. nuclear force 6. What did Newton develop? a. a rocket b. the theory of evolution c. the Laws of Motion 7. __________ is the property of matter that causes an object to resist a change in motion, direction or speed. a. Pressure b. Mass c. Inertia 8. A golf ball has much more inertia than a bowling ball. a. true b. false 9. Newton's cradle demonstrates the __________ Law of Motion. a. fourth b. third c. second 10. Force and acceleration are always in the same direction. a. true b. false Physical Science in Action Friction 1. Friction is a force that opposes motion between two surfaces in contact with each other. a. true b. false 2. There is friction between two objects in contact that are not moving. a. true b. false 3. All surfaces are smooth. a. true b. false 4. Two surfaces sliding across each other results in __________. a. fluid friction b. rolling friction c. sliding friction 5. Two surfaces in contact with each other that are not sliding result in __________. a. sliding friction b. static friction c. no friction 6. There is __________ friction when objects roll rather than slide. a. less b. the same amount of c. more 7. What kind of friction occurs when at least one of the surfaces in contact is a fluid, like water or air? a. no friction b. fluid friction c. atmospheric friction 8. If a surface produces a lot of friction, it has a __________ mu factor. a. high b. medium c. low 9. Smooth surfaces have a__________ mu factor. a. high b. medium c. low 10. Which of the following surfaces has a high mu factor? a. ice b. asphalt c. polished wood Physical Science in Action Gravity 1. __________ is a push or pull on an object that causes a change in motion. a. Force b. Mass c. Weight 2. What is the fundamental force of attraction between all objects? a. gravity b. weight c. friction 3. Gravity is dependent upon both mass and __________. a. acceleration b. distance c. weight 4. Who is the 17th century physicist that published The Law of Universal Gravitation? a. Guttenberg b. Newton c. Galileo 5. __________ is the amount of matter in an object. a. Gravity b. Weight c. Mass 6. Since the Moon has only one-sixth the mass of Earth, its gravity is only __________ as strong. a. two-thirds b. one-fourth c. one-sixth 7. Your weight __________ as you go up in elevation. a. increases b. stays the same c. decreases 8. What Italian scientist proved that objects fall at the same rate regardless of their weight? a. Newton b. Galileo c. Darwin 9. __________ is the force due to air particles that opposes gravity and slows down the motion of objects. a. Velocity b. Air resistance c. Orbit 10. As objects fall, gravity causes their speed to __________. a. increase b. decrease c. stay the same
