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FORCE AND MOTION

FORCE AND MOTION. 8 TH GRADE ORAL-R. Use the graph to answer questions 1-3. Sound travels at a speed of 340 m/s at which temperature? a. 10˚C c. 14˚C 11˚C d. 20˚C At a temperature of 25˚C, sound travels at approximately a. 30 m/s c. 345 m/s b. 347 m/s d. 350 m/s.

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FORCE AND MOTION

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  1. FORCE AND MOTION 8TH GRADE ORAL-R

  2. Use the graph to answer questions 1-3. • Sound travels at a speed of 340 m/s at which temperature? • a. 10˚C c. 14˚C • 11˚C d. 20˚C • At a temperature of 25˚C, sound travels at approximately • a. 30 m/s c. 345 m/s • b. 347 m/s d. 350 m/s • What is the relationship between air temperature and the speed of sound? • a. As air temperature increases, the speed of sound decreases • b. As air temperature increases, the speed of sound increases • As air temperature increases, the speed of sound remains the same • As air temperature remains the same, the speed of sound increases

  3. Use the diagram to the right to answer questions 4-5 • 4. The tool shown in the diagram is best used to measure ? • a. Forcec. Volume • Weightd. Density • The tool shown in the diagram measures in which units? • a. Ouncesc. Newtons • b. Millilitersd. Centimeters

  4. Use the diagram and data table to answer questions 6-9 • Which of these questions can be tested by the experimental design used in the investigation? • a. Will the length of the string affect the completion time for 20 swings? • b. Will the mass of a pendulum affect the completion time for 20 swings? • c. Will the distance the string is pulled back affect the completion time for 20 swings? • d. Will the distance the string is pulled back affect the mass of the pendulum? • 7. At which point does the pendulum have the least amount of potential energy? • a. Point 1 c. Point 5 • b. Point 2 d. Point 9 • What is the independent variable in this investigation? • a. Completion time for 20 swings c. Distance string is pulled back • b. Mass of the pendulum d. Length of the string

  5. 9. Which conclusion is supported by the data? • a. The mass of the pendulum does not affect the completion time for 20 swings • b. The length of the string does not affect the completion time for 20 swings • The length of the string does not affect the number of trials used • d. The distance the string is pulled back does not affect the completion time for 20 swings

  6. Use the table above to answer question 10 • 10. If a force of 50N is applied to each of the three objects, which one will have the greatest acceleration? • a. Object X because it has the greatest mass c. Object Y because it has the least volume • b. Object Z because it has the least mass d. Object Z because it has the greatest volume

  7. 11. A driver traveled 270 km in 3 hours. The driver’s destination was still 150 km away. What was the drivers speed at this point? • a. 40 km/h c. 90 km/h • b. 140 km/h d. 420 km/h • Motion is a change in _______ • a. Speed c. Force • b. Velocity d. Position • 13. You use distance and time to calculate a rate of _______ • a. Speed c. Displacement • Force d. Acceleration • 14. The force that opposes motion is ________ • a. A balanced force c. An accelerating force • b. An unbalanced force d. Friction

  8. 15. Force is defined as a _____________ or a _____________ • a. Shove, push c. Kick, pull • Push, slide d. Push, pull • 16. When a car slows down at a traffic light, it is _________ • a. Accelerating c. Decreasing its displacement • b. Traveling at constant velocity d. Changing direction • 17. Every force has an ________ force. • a. Equal and opposite c. Long-Range • Reaction d. Accelerating • 18. When two birds are pulling on a worm and the worm moves toward the first bird, you know that the forces are: • a. Long-range c. Unbalanced • b. Action-reaction d. Balanced

  9. 19. A bike travels 6 km/hr. This is an example of ___________. • a. Distance c. Motion • b. Displacement d. Speed • 20. Any change in speed or direction is known as _________. • a. Inertia c. Force • b. Acceleration d. Speed • 21. The amount of inertia an object has depends on its: • a. Mass c. Volume • b. Density d. Length • 22. ____________ energy is the energy of motion. • a. Solar c. Potential • b. Thermal d. Kinetic

  10. 23. The type of forces that cause motion are ____ • a. Balanced c. Unbalanced • b. Friction d. Inertia 24.The table of data represented in the graph to the right is: c. a. b. d.

  11. 25. Which item below would have the most inertia? a. A bowling ball c. A golf ball • A tennis ball d. A ping-pong ball • 26. A frog jumps from lily pad to lily pad and covers a distance of 15 meters. If he jumps at a rate of 3 m/min, how long will it take for him to jump that distance? a. 5 minutes c. 45 minutes • .5 minutes d. .45 minutes • 27. Which of Newton’s Laws best explains the idea of inertia? a. First law c. Second law b. Third law d. Both b & c

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