Review for Honors Physics final

1. An object moves at a constant speed of 6 m/s. This means that the object: A. Increases its speed by 6 m/s every second B. Decreases its speed by 6 m/s every second C. Doesn’t move D. Has a positive acceleration E. Moves 6 meters every second The graph below describes the relationship between velocity and time for a moving object. Use this graph for questions 2 through 6. 2. What is the acceleration at time t = 1 s? A. 4 m/s 2 B. 2 m/s 2 C. -2 m/s 2 D. -4 m/s 2 3. What is the acceleration at time t = 8 s? A. 4 m/s 2 B. -2 m/s 2 C. -4 m/s 2 D. 0 m/s 2 4. What is the acceleration at time t = 6 s? A. 1 m/s 2 B. 2 m/s 2 C. -4 m/s 2 D. 0 m/s 2 5. What is the total displacement for the entire trip? A. 18 m B. 12 m C. 6 m D. 30 m 6. What is the total traveled distance for the entire trip? A. 18 m B. 12 m C. 6 m D. 30 m

The diagram above illustrates a person who, starting from the origin, walks 8 km east during first day, and 5 km west the next day. Use it to answer questions 5 and 6. 7. What is the net displacement of the person from the initial point in two days? A. 6 km, east B. 3 km, east C. 10 km, west D. 5 km, west E. 9 km, east 8. What is the traveled distance of the person from the initial point in two days? A. 13 km B. 3 km C. 10 km D. 5 km E. 9 km The position vs. time graph of a moving object is shown to the right. Use this graph to answer questions 8 through 11. 9. What is the average speed from 0 s to 4 s? A. 0.5 m/s B. 1 m/s C. 2 m/s D. 3 m/s E. 4 m/s 10. What is the average speed from 4 s to 8 s? A. 0.5 m/s B. 1 m/s C. 2 m/s D. 3 m/s E. 4 m/s 11. What is the object’s position at 6 s? A. 2 m B. 1 m C. 3 m D. 7 m E. 9 m 12. What is the average acceleration from 4 s to 8 s? A. 0 m/s 2 B. 1 m/s 2 C. 2 m/s 2 D. 3 m/s 2 E. 4 m/s 2

18. A marble launcher shoots a marble horizontally from the height of 0.2 m above a horizontal floor. The marble lands on the floor 5 m away from the launcher. What is the initial speed of the marble? A. 5 m/s B. 10 m/s C. 15 m/s D. 25 m/s 19 When a projectile reaches the highest point the vertical component of the acceleration is: A. Greater than g B. Positive g C. Negative g D. Zero 20. When a projectile reaches the highest point the horizontal component of the acceleration is: A. Less than g B. Positive g C. Negative g D. Zero 21. In the absence of a net force, a moving object will A. slow down and eventually stop B. stop immediately C. turn right D. move with constant velocity E. turn left 22. When a cat sleeps on a table, the net force on it is A. zero B. directed upward C. directed downward D. directed in the horizontal direction E. more information is required 23. Which Newton’s law can explain the following statement that we often see on the highway display: “Buckle up –it’s the State Law”? A. First Newton’s Law B. Second Newton’s Law C. Third Newton’s Law D. Gravitational Law E. None from the above

24. The acceleration of an object is directly proportional to A. the net force acting on it B. its position C. its velocity D. its mass E. its displacement 25. The acceleration of an object is inversely proportional to A. the net force acting on it B. its position C. its velocity D. its mass E. its displacement 26. A loaded truck collides with a car causing huge damage to the car. Which of the following is true about the collision? A. The force on the truck is greater than the force on the car B. The force on the car is greater than the force on the truck C. The force on the truck is the same in magnitude as the force on the car D. During the collision the truck makes greater displacement than the car E. During the collision the truck has greater acceleration than the car 27. Action-reaction forces are A. equal in magnitude and point in the same direction B. equal in magnitude and point in opposite directions C. unequal in magnitude but point in the same direction D. unequal in magnitude and point in opposite directions E. cancel each other 28. Earth pulls downward on a pen , of mass m, which is sitting on a table; the magnitude of the force is mg. If that is called the action force, what is the reaction force? A. The table pushing up on the pen with a force equal to mg B. The pen pushing down on the table with a force equal to mg C. The pen pulling upward on Earth with a force equal to mg D. The pen pulling up on the table with a force equal to mg 29. Mass and weight A. Both have the same measuring units B. Both have different measuring units C. Both represent force of gravity D. Both represent measure of inertia E. None from the above 30. The acceleration due to gravity is higher on Jupiter than on Earth. The mass and weight of a rock on Jupiter compared to that on Earth would be A. same, more B. same, less C. more, more D. more, less E. same, same

35. An object moves around a circular path at a constant speed and makes five complete revolutions in 20 seconds. What is the period of rotation? A. 5 s B. 10 s C. 4 s D. 20 s E. 15 s 36. An object moves around a circular path at a constant speed and makes ten complete revolutions in 5 seconds. What is the frequency of rotation? A. 2 Hz B. 4 Hz C. 6 Hz D. 10 Hz E. 20 Hz 37. An object rotates with a period of 10 s. How many revolutions will it make in 25 s? A. 10 B. 15 C. 5 D. 2.5 E. 2 38. An object rotates with a frequency of 300Hz. How many revolutions will it make in 15 s? A. 1000 B. 1500 C. 2000 D. 3500 E. 4500 39. An object rotates with a period of 0.5 s. What is the frequency of rotations? A. 1.0 Hz B. 1.5 Hz C. 2.0 Hz D. 2.5 Hz E. 3.0 Hz 40. An object rotates with a frequency of 50 Hz. What is the period of rotations? A. 0.02 s B. 0.15 s C. 0.25 s D. 0.05 s E. 0.03 s 41. A truck driver is trying to push a loaded truck with an applied force. Unfortunately, his attempt was unsuccessful the truck stays stationary no matter how hard the driver pushes. How much work is done by the driver? A. Fd B. –Fd C. F/d D. d/F E. Zero 42. A block of mass m is pulled over a distance d by an applied force F which is directed in parallel to the displacement. How much work is done on the block by the force F? A. mFd B. zero C. Fd D. F/d E. –Fd 43. A block of mass m is moved over a distance d. An applied force F is directed perpendicularly to the block’s displacement. How much work is done on the block by the force F? A. mFd B. zero C. Fd D. F/d E. –Fd

44. The force as a function of displacement of a moving object is presented by the graph. How much work is done when the object moves from 0 m to 5 m? A. 30 J B. 12.5 J C. 18 J D. 9 J E. 24 J 45. The force as a function of displacement of a moving object is presented by the graph. How much work is done when the object moves from 5 m to 8 m? A. 30 J B. 15 J C. 18 J D. 7.5J E. 24 J 46. The force as a function of displacement of a moving object is presented by the graph. How much work is done when the object moves from 0 m to 8 m? A. 30 J B. 15 J C. 18 J D. 9 J E. 20 J 47. An applied force F accelerates an object from rest to a velocity v . How much work is done by the applied force F? A. ½ mv 2 B. mgh C. ½ kx 2 D. mFd E. Zero 48. What happens to the kinetic energy of a moving object if the net work done is positive? A. The kinetic energy increases B. The kinetic energy decreases C. The kinetic energy remains the same D. The kinetic energy is zero E. The kinetic energy becomes negative

57. A stationary skateboarder I with a mass of 50 kg pushes a stationary skateboarder II with a mass of 75 kg. After the push the skateboarder II moves with a velocity of 2 m/s to the right. What is the velocity of the skateboarder I? A. 3 m/s to the left B. 2 m/s to the left C. 1 m/s to the right D. 3 m/s to the right E. 2 m/s to the right 58. Block A with a mass m moves on a frictionless horizontal surface at a constant velocity v and collides elastically with an identical block B. What is the velocity of block A after the collision? A. 0 m/s B. v C. 1/2v D. 1/3v E. 2/3v 59. Block A with a mass m moves on a frictionless horizontal surface at a constant velocity v and collides elastically with an identical block B. What is the velocity of block B after the collision? A. 0 m/s B. v C. 1/2v D. 1/3v E. 2/3v 60. A light beach ball moving with a velocity 2 m/s to the right collides elastically with a stationary bowling ball. After the collision the bowling ball remains stationary. What is the velocity of the beach ball after the collision? A. 0 m/s B. 2 m/s to the left C. 4 m/s to the left D. 3 m/s to the left E. 1 m/s to the left 61. A bowling ball moving with a constant speed v collides elastically with a stationary beach ball. After the collision the bowling ball barely slows down. What is an approximate speed of the beach ball after the collision? A. v B. v C. v D. 2v E. 3v 62. When two objects collide inelastically the momentum is conserved. Which of the following is true about the kinetic energy during the collision? A. The kinetic energy is conserved B. The kinetic energy is not conserved C. The kinetic energy is gained D. The kinetic energy completely transforms into thermal energy

63. A positively charged sphere A is brought close without touching to a neutral sphere B. Sphere B is touched with a grounded wire. What is the charge on sphere B after the wire is removed? A. Positive B. Negative C. It stays neutral D. It depends on the contact time E. It depends on the material that sphere B is made of 64. Two positive charges with magnitudes 4Q and Q are separated by a distance r. Which of the following statements is true? A. The charge with a greater magnitude exerts a larger force on the small charge B. The charge with a greater magnitude exerts a smaller force on the small charge C. The forces on each charge are the same in magnitude and opposite in direction D. The forces on each charge are the same in magnitude and pointing in the same direction 66. Sphere A carries a positive charge 4Q and sphere B is neutral. Initially the spheres are separated by a distance r. The spheres briefly touch each other and move to the initial separation. What is the new charge on each sphere? 67. Which of the following is the correct expression for the force on each sphere after they moved to the original distance r?

10) An object falls from a height of 490 m. How much time does it take for the object to reach the ground? 11) A projectile is fired with an initial speed of 150 m/s at an angle of 47 ̊ above the horizontal. a. Determine the total time in the air. b. Determine the maximum height reached by the projectile. c. Determine the maximum horizontal distance covered by the projectile. d. Determine the velocity of the projectile 5 s after firing. 12) A woman weighs 580 N. What is her mass? 13) James applies a 100N force to a 5 kg object. As the object slides across the floor, it experiences a friction force of 80N. What is the magnitude and direction of the acceleration of the object? 14) A 250 N force (F1) acts upwards on a 10 kg object while a second force (F2) of magnitude 300 N acts downwards. What is the magnitude and direction of the acceleration of the object? 15) The force of friction between an object and the surface upon which it is sliding is 12N. The weight of the object is 20N. What is the coefficient of kinetic friction? 16) A 500 kg mass is spun in a circle of radius 25 m with a velocity of 250 m/s. a. *What is the period of its rotation? b. *What is its frequency? c. What is its acceleration? d. What force does it experience?

17. A small block, with a mass of 1.5 kg, starts from rest at the top of the apparatus shown above. It then slides without friction down the incline, around the loop and then onto the final level section on the right. It then collides with a spring which momentarily brings the block to a stop. The maximum height of the incline is 2.5 m, the radius of the loop is 0.9 m and the spring constant is 90 N/m. a. Find the initial potential energy of the block. b. Find the velocity of the block at the top of the loop. c. Find the velocity of the block after it goes around the loop, on the flat section of the path. d. How much will the block compress the spring before momentarily coming to a stop? 18. A small cube, with a mass of 25 g, slides along a frictionless horizontal surface at a constant speed of 18 m/s until it collides with, and sticks to, a large wooden 3.5 kg block. The large block is attached to the left end of a spring with a spring constant of 100 N/m as shown above. a. What is the momentum of the cube before the collision? b. What is the kinetic energy of the cube before the collision? c. *Find the speed of the combined cube and block system just after the collision. d. *Find the kinetic energy of the cube-block system just after the collision. e. *What is the maximum potential energy that can be stored in the spring due to this collision? f. *How far will the cube-block system move before it stops?