SOAL UJIAN AKHIR SEMESTER

UJIAN AKHIR SEMESTER
PRODI : MATEMATIKA
FKIP UBT TAHUN 2010
PETUNJUK :
1.Kerjakan soal di bawah ini dan kirimkan jawabannya beserta alasan singkat setiap butir nya
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Force, Motion, and Energy Test
Theresa creates a test to assess students' knowledge of force and motion principles using the following multiple choice items.
________________________________________Multiple Choice Science Test
_______1. The tendency of an object to resist any change of motion is known as ______.
a. force
b. mass
c. inertia
d. balance
_______2. The amount of matter in an object is called its ________.
a. mass
b. balance
c. force
d. weight
_______3. The greater the mass of an object,
a. the less force it can exert.
b. the more space it takes up.
c. the more balanced it is.
d. the greater the inertia.
_______4. The force of gravity of a person or object at the surface of a planet is known as?
a. mass
b. air resistance
c. inertia
d. weight
_______5. A book is sitting on a dashboard of a car that's stopped at a traffic light. As the car starts to move forward, the book slides off the dashboard. Pick the most correct explanation.
a. There was grease on the dashboard
b. The object had inertia.
c. A supernatural force took over.
d. Air resistance made the book move backward.
_______6. The law of universal gravitation states that
a. two objects always exert gravitational forces on each other.
b. the force of gravity depends on the mass and the distance between the two objects.
c. all objects fall at different rates on earth.
d. both a and b.
_______7. A force that one surface exerts on another when the two rub against each other is called ________.
a. gravity
b. acceleration
c. inertia
d. friction
_______8. According to Newton's Third Law of Motion, when a hammer strikes and exerts a force on a nail, the nail
a. creates a balanced force.
b. disappears into the wood.
c. moves at a constant speed.
d. exerts and equal and opposite force back on the hammer.
_______9. Pick the best example of Newton's Third Law in action.
a. A rocket taking off from earth which pushes gasses in one direction and the rocket in the other.
b. A rocket sitting on the ground preparing for take-off but it needs an outside force to overcome its inertia of a non-moving object.
c. A rocket that is accelerating through space and exerts a great amount of force because its mass and acceleration is so large.
d. Both b and c.
_______10. Pick the best example of Newton's Second Law in action.
a. A rocket taking off from earth which pushes gasses in one direction and the rocket in the other.
b. A rocket sitting on the ground preparing for take off but it needs an outside force to overcome its inertia of a nonmoving object.
c. A rocket that is accelerating through space and exerts a great amount of force because its mass and acceleration is so large.
d. Both b and c.
_______11. Pick the best example of Newton's First Law in action.
a. A rocket taking off from earth which pushes gasses in one direction and the rocket in the other.
b. A rocket sitting on the ground preparing for take off but it needs an outside force to overcome its inertia of a nonmoving object.
c. A rocket that is accelerating through space and exerts a great amount of force because its mass and acceleration is so large.
d. Both b and c
_______12. According to the law of conservation of momentum, when two objects collide in the absence of friction,
a. momentum is not lost.
b. velocity increases.
c. velocity decreases.
d. only the object with the larger mass continues on.
_______13. Which of the following is an example of momentum in action?
a. A person jogging through the park.
b. A bowling ball hitting pins.
c. A person playing pool.
d. Both b and c.
_______14. How can you increase the momentum of an object?
a. By increasing its mass or velocity.
b. By increasing its acceleration and and friction force.
c. By increasing its friction force and mass.
d. Both b and c.
_______15. An example of a balanced force is
a. a car sliding on ice.
b. a tug-of-war game in which no one wins.
c. a car hitting a telephone pole.
d. a roller coaster going down the first drop.
_______16. An example of an unbalanced force (net force) is
a. a car parked in the garage.
b. a tug-of-war game in which no one wins.
c. a bridge.
d. a roller coaster going down the first drop.
_______17. In physical science, a push or pull is called a(n)________.
a. gravity
b. force
c. universal law
d. inertia
_______18. When two equal forces act on the same object in opposite directions, the net force is ________.
a. crazy
b. greater than either force
c. zero
d. smaller than either force
_______19. The word "acceleration" means to
a. exert a force on another object.
b. create a balanced force on another object.
c. create an unbalanced force on another object.
d. change the speed or direction.
_______20. Which is the best example of a constant speed?
a. A car cruising on the Interstate.
b. A car cruising on CIM Street.
c. A car crashing into another car.
d. A car exploding.
_______21 What is the difference between an average speed and a constant speed?
a. A constant speed has the same speed at every point on a graph, and average speed is computed by dividing the total distance by the total time; each point on the graph could be a different speed.
b. Constant speed is faster than average speed.
c. Average speed is faster than constant speed.
d. An average speed has the same speed at every point on a graph, and a constant speed is computed by dividing the total distance by the total time; each point on the graph could be a different speed.
_______22. Two main outside forces acting on most anything on earth are
a. friction and mass.
b. friction and gravity.
c. gravity and inertia.
d. gravity and mass.
_______23. A roller coaster climbing the first hill is an example of
a. building kinetic energy.
b. building potential energy.
c. gravitational forces.
d. nuclear energy.
_______24. A roller coaster going down the first drop is an example of
a. kinetic energy.
b. potential energy.
c. nuclear energy.
d. all of the above.
_______25. The forces that pulls falling objects to Earth is called
a. free fall.
b. gravity.
c. air resistance.
d. acceleration.
_______
If the item describes kinetic energy, write KE. If the item describes potential energy, write PE.
_______26. A person running _______27. A new car battery
_______28. The top of a roller coaster _______29. Flag blowing in the wind

_____________________
Test Item number 30 to 37 are deleted. The student must not do it
___________________
_______38. A sprinter runs the 225m in a time of 25 seconds. What is the sprinter's speed?
a. 5625 m/sec.
b. 56 m/sec.
c. 9 m/sec.
d. 9 m/hr
_______39. A 535 kg car is moving at a velocity of 55 m/hr north. What is the car's momentum?
a. 29.42 kg-cm/hr
b. 9.72 kg-m/hr
c. 29,425 kg-m/hr
d. 972 kg-m/hr
Answer the questions below after reading the following passage.
A massive roller coaster has been built in Twin Falls, ID and you have been hired to make some calculations for their promotional brochure. The company has heard about your expertise in this area. The roller coaster has a height of 285 meters on the first hill. The drop length is 310 meters (on the first hill). It takes 3 seconds for the roller coaster car to go from the top to the bottom of the first drop. It takes 4 seconds to reach the top of the second hill, which is 150 meters in length. You have realized there is a flaw in the design because the force on the second hill is too great. You notify the builders and become a local hero celebrated for your intelligence. (Oh, by the way, the mass of the roller coasters cars is 225 kg). Draw a diagram, it will help. Attach your work process.
_______40. What was the force on the second hill?
a. -3234.36 N
b. 0.0733 N
c. -3,703 N
_______41. What is the speed on the first drop?
a. 95 m/sec.
b. 103.33 m/sec.
c. 323.22 m/sec.
_______42. What is the momentum after the first drop?
a. 23,249.25 kg-m/sec.
b. 2,137 g-m/sec.
c. 21,375 kg-m/sec.
d. 57.8 kg-m/sec.
_______43. What is the kinetic energy of the first drop?
a. 1,201 N
b. 1,015,312.50 kg-m2/s2
c. 1,201,172 kg-m2/s2
_______44. What is the potential energy of the first drop?
a. 628.42 N
b. 64,125 J
c. 683,550 J
d. 628,425 J
_______45. Which of Newton's Laws would allow a passenger to fly right out of his seat if he did not have a lap belt over him and the roller coaster suddenly stopped?
a. First law - "Once in motion..."
b. Second law - "Mass x acceleration =..."
c. Third law - "For every action there is an..."
_______46. Your body bouncing back into your seat after hitting the lap bar is an example of which of Newton's Laws in action?
a. First law - "Once in motion..."
b. Second law - "Mass x acceleration =..."
c. Third law - "For every action there is an..."
_______47. The amount of force of the passenger as he hits the lap bar is an example of which of Newton's Laws in action?
a. First law - "Once in motion..."
b. Second law - "Mass x acceleration =..."
c. Third law - "For every action there is an..."

Label the following numbers
_______48. 2.56 m/sec. _______49. 143.2 cm/sec/hour
_______50. 2.7 km/sec.2 _______51. 52 kg-m/sec.
_______52. 632.6 kg-m2/s2 _______53. 748,987 J
_______54. 786 N. _______55. 85 mi./hr.
(Answers may be used more than once)
a. Acceleration b. Speed
c. Force d. Momentum
e. Kinetic energy f. G.P.E.

_______56. Convert 55.7 g into kilograms
a. .557 kg
b. .00557 kg
c. .0557 kg
d. 55700 kg
_______57. Convert 678.92 cm into meters
a. 6.7892 m
b. 67892 m
c. .67892 m
d. 678920 m
_______58. Convert 25 m into centimeters
a. 250 cm
b. 2,500 cm
c. .25 cm
d. .025 cm
_______59. Convert 25 m into kilometers
a. 2500 km
b. .25 km
c. .025 km
d. 25000 km
_______60. Convert 43.89 km into meters
a. .04389 m
b. .4389 m
c. 43,890 m
d. .004389 m
_______61. When energy is stored it is called ________.
a. kinetic energy
b. potential energy
c. nuclear energy
d. gravitational energy
_______62. What is energy called when it is released?
a. Kinetic energy
b. Potential energy
c. Nuclear energy
d. Gravitational energy
_______63. How much would an object weigh on the moon if its mass is 656 kg and the moon's gravitational rate is 1.6 m/sec/sec?
a. 6,618.8 N
b. 1,049.6 J
c. 1,049.6 N
d. 6,618.8 J
_______64. How much would the same object weight on earth?
a. 6428.8 N
b. 1049.6 J
c. 1049.6 N
d. 6428.8 J
_______65. What is the acceleration rate of a free falling object on the third second it is falling?
a. 19.6 m/sec/sec
b. 29.4 m/sec/sec
c. 39.2 m/sec/sec
d. None of the above.
_______66. What is the definition of weight?
a. A gravitational force on a mass.
b. How big an object is.
c. The amount of matter in an object.
d. The amount of space an object takes up.

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