Ch 1-2 review ppt
- 4. An object at rest is not moving, so its speed is always zero. Speed-Time Graphs (cont.)
- 5. For an object moving at constant speed, the speed-time graph is a horizontal line. Speed-Time Graphs (cont.)
- 6. The line on the speed-time graph for an object that is speeding up has an upward slope. Speed-Time Graphs (cont.)
- 7. Speed-Time Graphs (cont.) The line on the speed-time graph for an object that is slowing down has a downward slope.
- 9. Interpret The Graph Below:
- 10. Interpret The Graph Below: The graph shows an object which is not moving (at rest). The distance stays the same as time goes by because it is not moving.
- 11. Interpret The Graph Below:
- 12. Interpret The Graph Below: The graph shows that the objects distance increases as time passes. The object is moving and so it has velocity. The straight line shows it is a constant (not changing).
- 13. Interpret The Graph Below:
- 14. Interpret The Graph Below: Just like the previous graph, this graph shows an object moving with constant velocity
- 15. Interpret The Graph Below:
- 16. Interpret The Graph Below: The curve in the graph shows that the objects velocity is changing as time passes. This is acceleration.
- 17. Interpret The Graph Below:
- 18. Interpret The Graph Below: In the first part of the graph the object is moving with constant velocity. In the second part of the graph the object is at rest (not moving). In the third part the object is again moving with constant velocity.
- 19. Interpret The Graph Below:
- 20. Interpret The Graph Below: The graph shows that the objects velocity does not change as time passes. It shows constant velocity.
- 21. Interpret The Graph Below:
- 22. Interpret The Graph Below: The graph shows that the objects velocity is increasing as time passes – it is accelerating. The straight line shows that it is constant acceleration.
- 23. What is the object doing during a, b, & c?
- 24. What is the object doing during A-B?
- 25. What is the object doing during C-D?
- 26. What is the object doing during D-E?
- 27. An elevator travels a distance of 220 m from the first floor to the 60th floor in 27.5 s. What is the elevator’s average speed? v = d/t v = 220 m 27.5 s v = 8 m/s
- 28. What is the net force on a Dragster with a mass of 900 kg if its acceleration is 32.0 m/s2 ? F = ma F = 900 kg x 32 m/s2 F = 28,800 N
- 29. At the end of a race,At the end of a race, a sprinter with aa sprinter with a mass of 80 kg has amass of 80 kg has a speed of 10 m/s.speed of 10 m/s. What is the sprinter’sWhat is the sprinter’s momentum?momentum? p = mv p = 80 kg x 10 m/s p = 800 kg m/s
- 30. A ball rolls down a ramp, starting from rest. After 2 seconds, its velocity is 6 meters per second. What is the acceleration of the ball? vi = 0 m/s vf = 6 m/s t = 2 s a = (6 m/s – 0 m/s) / 2 s a = 3 m/s2
- 31. A jet airliner starts at rest and moves down theA jet airliner starts at rest and moves down the runway. After accelerating for 20 s, itrunway. After accelerating for 20 s, it reaches a final speed of 80 m/s. What isreaches a final speed of 80 m/s. What is the acceleration of the jet airliner?the acceleration of the jet airliner? a = vf – vi t a = 80m/s – 0 m/s 20 s a = 4 m/s/s or 4 m/s2
- 32. A car is being pulled by a tow truck. What is the car’s mass if the net force on the car is 3,000 N and it has an acceleration of 2.0 m/s2 ? m = F/a m = 3,000 N 2.0 m/s2 m = 1500 kg
- 33. A. motion B. reference point C. displacement D. direction Which of these refers to the difference between the initial position and the final position of an object?
- 34. A. speed B. constant speed C. instantaneous speed D. average speed The total distance traveled divided by the total time taken to travel that distance is known as which of these?
- 35. A. a wavy line B. a crooked line C. a straight line D. a curved line How is constant speed represented on a distance-time graph?
- 36. A. increasing speed B. decreasing speed C. a change in direction D. all of the above An object accelerates when its velocity changes as a result of which of these?
- 37. A. the horizontal axis (the x-axis) B. the vertical axis (the y-axis) C. both of these D. neither of these On a speed-time graph, where is time located?
- 38. A. displacement B. position C. reference direction D. reference point What term refers to a starting point that can be used to locate a place or thing?
- 39. A. displacement B. reference point C. motion D. velocity Which term refers to the process of changing position?
- 40. A. velocity B. constant speed C. average speed D. instantaneous speed Which of these describes the speed and the direction of a moving object?
- 41. A. direction B. speed C. acceleration D. velocity Which term refers to a measure of how much the velocity of an object changes in a unit of time?
- 42. A. contact force B. gravity C. mass D. weight Which refers to gravitational force exerted on an object?
- 43. A. net force B. lubricant C. gravity D. friction Which is a force that opposes the movement between two touching surfaces?
- 44. A. balanced forces B. inertia C. net force D. unbalanced forces Which refers to forces that combine and form a net force that is not zero?
- 45. A. friction B. inertia C. unbalanced forces D. velocity Which could cause an object to stop moving?
- 46. A. zero B. one C. equal D. balanced When equal forces act on an object in opposite directions, what is the net force on the object?
- 47. A. Newton’s third law of motion B. Newton’s second law of motion C. Newton’s first law of motion D. law of conservation of momentum Which law explains that every force has a reaction force in the opposite direction?
- 48. A. velocity B. momentum C. inertia D. elastic collision Which is a measure of how hard it is to stop a moving object?
- 49. A. unbalanced B. terminal C. centripetal D. balanced Which term refers to forces that combine with a net force of zero?
- 50. A. velocity B. terminal velocity C. net force D. inertia The tendency of an object to resist a change in its motion is called what?
- 51. A. Newton’s third law of motion B. Newton’s second law of motion C. Newton’s first law of motion D. law of conservation of momentum Which law states that the total momentum of a group of objects stays the same unless outside forces act on the objects?
- 52. A. contact B. gravitational C. noncontact D. static Which describes the magnetic force?
- 53. A. unbalanced B. proportional C. noncontact D. negative Which describes the net force of different forces acting in the same direction?
- 54. A. stops B. speeds up C. slows down D. changes direction If the net force acting on a moving object is in the direction that the object is moving, the object does what?