1. 8 th Grade Physics in Review Take this quiz and look at your score. Reflect. Take the quiz again as may times as you need to in order to feel good about your understanding of these concepts. Remember that your attitude can determine altitude. You CAN do it!!!

2. Forces 1. A force is 2. Force is a vector quantity because it has 3. The SI unit used to measure the magnitude of a force is the 4. The combination of all the forces acting on an object is called the 5. Equal forces acting on one object in opposite directions are called

3. Forces Continued 6. The tendency of an object to resist motion is called 7. Gravity is a force that 8. The two elastic forces are 9. Friction is a force that 10. When a book is sitting on a table, what is the force of the table pushing up on the book called?

4. Finishing Forces 11. If the net force on a chair is 6N to the right, what will occur? 12. A centripetal force is 13. What is the effect of lift? 14. The rate at which velocity changes with time is called 15. The rate at which velocity changes with time is called 16. The acceleration of an object depends both on the net force acting on the object and on 17. Acceleration equals

5. Astronomical Forces 18. Astronomers theorize that the universe began with a enormous explosion of matter (force) called 19. The sun was formed when 20. The path of an object as it revolves around another object is space is called a(an) 21. The force that holds the moon in orbit around the Earth is

6. Motion 22. A standard reference point is a place or object 23. Name an object that would make a good reference point. 24. The position of an object can be defined using a reference point and a set of 25. The speed of an object is the 26. Velocity is speed 27. Velocity is a vector quantity because it has both

7. More on Motion 28. What equation can be used to determine the speed of a moving object? 29. What equation can be used to determine the average speed of a moving object? 30. What equation is used to solve a problem that involves finding distance, given the time and average speed?

8. A Final Word on Motion 31. A change in a speed, direction, or both is a change in a moving object’s 32. What is the SI unit of acceleration? 33. On a position-versus-time graph, where is time shown? 34. Slope is 35. To determine the slope of a line,

9. Density and Buoyancy 36. The density of a substance is based on the substance’s 37. Which unit is used to express the density of a substance? 38. When a sample of liquid is divided in half, its density 39. What is density used to determine? 40. How is the mass of a rectangular solid measured? 41. How is the mass of an irregular solid measured?

10. Wrapping Up Density and Buoyancy 42. A beach ball pops out of water because the buoyant force is 43. Why does a ship float, when a solid block of steel of equal weight sinks? 44. Why does an air-filled balloon fall to the ground? 45. Whether an object will sink or float in a fluid can be predicted by knowing