TALIGAMAN NATIONAL HIGH SCHOOLTaligaman, Butuan CitySECOND PERIODIC EXAMINATIONSCIENCE IV (PHYSICS)

Instruction: Choose the letter of the best answer.1. A ball launched into the air at 45 to the horizontal initially hasA. equal horizontal and vertical components.B. components that do not change in flight.C. components that affect each other throughout flight.D. a greater component of velocity than the vertical component.2. When no air resistance acts on a projectile, its horizontal acceleration isA. gB. at right angles to gC. upward, gD. zero.3. Without air resistance, the time for a vertically tossed ball to return to where it was thrown isA. 10 m/s for every second in the air.B. the same as the time going upward.C. less than the time going upward.D. more than the time going upward.Use the passage to answer questions 4 -5A girl riding a bicycle at 2.0 m/s throws a tennis ball horizontally forward at a speed of 1.0 m/s from a height of 1.5 m. At the same moment, a boy standing on the sidewalk drops a tennis ball straight down from a height of 1.5 m.4. What is the initial speed of the girls ball relative to the boy?A. 1.0 m/s B. 2.0 m/sC. 1.5 m/s D. 3.0 m/s5. If air resistance is disregarded, which ball will hit the ground first?A. the boys ball B. neither C. the girls ball D. cannot be determined6. To obtained the maximum range, at what angle the projectile must be fired?A. 300B. 450C. 600D. 9007. Force can produce changes in motion. The following are changes that force produce except:A. force causes an object at rest to start in motion.B. force causes a moving object to stopC. force causes a moving object to change its direction.D. force causes an object to change its state of matter.8. After a cannon ball has been fired into a frictionless space, how much force is needed to keep it going?A. zero, since no force is necessary to keep it goingB. one-half of the force with which it was firedC. twice the force with which it was firedD. the same amount of force with which it was fired9. If a horse pulls on a calesa at rest, the calesa pulls back equally as much on the horse. Will the calesa be set in motion?A. No, because the forces cancel each other.B. Yes, because there is a net force acting on the calesa.C. Yes, because there is a time delay between action and reaction.D. Yes, because the horses pull on the calesa is larger than the calesas pull on the hoese.10. All of the following are the manifestation of the third law of motion except:A. rowing a bancaB. recoiling of gunsC. falling objectsD. swimming11. The law of inertia applies to _______________. A. moving objectsB. objects that are not moving C. both moving and nonmoving objects12. Suppose a cart is being moved by a force. If suddenly a load is dumped into the cart so that the carts mass doubles, what happens to the carts acceleration? A. It quadruples.B. It doubles.C. It halves.D. It quarters.13. An upward force of 600-N acts on a 50-kg crate. What is its accelearation?A. 0.82 m/s2B. 2.2 m/s2C. 11 m/s2D. 12 m/s214. A net force of 200-N is exerted to accelerate a cart from rest to a velocity of 40 m/s in 10-s. What is the mass of the cart?A. 50-kgB. 48.5-kgC. 5-kgD. 0.5-kg15. What can be said of an object whose mass stays constant but its momentum is changing?A. there is force acting on itB. Its velocity is changingC. It is accelerating (or decelerating)D. All of the above

16. m/s2 : acceleration : kg x m/s : ______________A. velocityB. SpeedC. MomentumD. DisplacementE. Acceleration17. The average momentum of a 50-kg cheetah which covers 400-m in 10-s isA. 1.25 kg.m/sB. 80 kg.m/sC. 1,000 kg.m/sD. 2,000 kg.m/s18. When the speed of an object is doubled, its momentumA. remains unchanged in accord with the conservation of momentum.B. doubles.C. quadruples.D. decreases.19. A moving bus has momentum. It moves twice as fast, its momentum is A. one half as its original momentumB. The sameC. Twice as muchD. Difficult to determine20. In order to catch a ball, a softball player moves his/her hand backward in the direction of the balls motion. Doing this reduces the force of impact on the players hand because _________________.A. the velocity of impact is reducedB. the momentum of impact is reducedC. the time is reduced.D. the time is decreased21. The theorem that is used by highway safety engineers to determine stopping time and safe following distances for cars and trucks. This also used to design safety equipment that decreases the force exerted on human body during collision.A. work-energy theoryB. Impulse-momentum theoryC. Law of Conservation of MomentumC. Inelastic collision22. The impulse-momentum relationship is a direct result of NewtonsA. first law.B. second law.C. third law.D. law of gravity.23. Fernando Jose hits a 0.05-kg golf ball, giving it a speed of 65-m/s. What impulse does he impart to the ball?A. 5.32 kg.m/sB. 3.25 kg.m/sC. 3.53 kg.m/sD. 2.53 kg.m/s24. A tennis ball may leave the racquet of a top player with a speed of 61-m/s when served. If the mass of the ball is 65-g and it is actually in contact with the racquet for 0.032-sa. What momentum does the ball have on leaving the racquet? b. What is the average force applied by the racquet on the ball? A. 4 kg.m/s & 124 NB. 0.4 kg.m/s & 421 NC. 4 kg.m/s & 241 ND. 124 kg.m/s & 4 N25. The total momentum of a system does not change if there are no net external forces acting on it.A. work-energy theorem B. Law of Conservation of MomentumC. impulse-momentum theoremD. First law of Motion26. A big fish swims upon and swallows a small fish at rest. After lunch, the big fish has less A. speed.B. momentum.C. both of theseD. none of these27. A falling firecracker bursts into two pieces. Compared with the momentum of the firecracker when it bursts, the two piecesA. combined have the same momentum.B. each have half as much momentum.C. have more momentum.D. may or may not have more momentum.28. A trolley of mass 4.0 kg and moving at 4.5 m s collides with, and sticks to, a stationary trolley of mass 2.0 kg. Their combined speed in m s after the collision is:A . 2.0 B. 3.0 C. 4.5 D. 9.029. In a perfectly elastic collision, which of the following is true?A. relative velocity after collision becomes zeroB. relative velocity after collision is less than befor collisionC. relative velocity after collision is equal that of before collision D. relative velocity after collision is more than before collision30. An example of this collision is between an arrow and a target. The moving arrow after it is released from the bow collides with the stationary target.A. Perfectly inelastic collisionB.Elastic collisionC. Inelastic collision31. A 0.25-kg arrow with a velocity of 15-m/s to the east strikes and pierces the bulls eye of a 7.0-kg target. What is the final velocity of the combined mass?A. 5.20 m/sB. 0.52 m/sC. 2.50 m/sD. 0.25 m/s32. Which of the following does NOT happen in a perfectly inelastic collision?A. the objects involved move with a velocity after collision.B. the objects involved are deformed to some degree.C. A small amount of energy is lost after the collision.D. the objects involved stick together after collision.33. Which of the following does NOT affect the amount of frictional force between surfaces in contact?A. the areas of the surfacesB. the normal force pressing one against the otherC. the application of a lubricantD. the state of motion of the surfaces34. Suppose the force of friction on a sliding object is 10N. The force needed for it to maintain a constant velocity is _______________.A. more than 10 NB. less than 10 N C. 10 N35. A block is dragged without acceleration in a straight-line path across a level surface by a force of 6 N. What is the frictional force between the block and the surface?A. less than 6 NB. 6 N C. more than 6 ND. Needs more information to say.36. A man prevents a 15-kg wood from falling by pressing it agains a vertical wall. What force must he use if the coefficient of friction is 0.3?A. 4.41 NB. 44.1 NC. 441 ND. 41.4 N37. In which situation is there NO work done on the system?A. a basket being liftedC. A big box dragged across the floorB. a person in an ascending elevatorD. A stone whirled around a horizontal circle38. Suppose you throw a ball upward. What happen to the balls energy as the ball moves up?A. its work increasesC. Its potential energy increasesB. its energy increasesD. Its kinetic energy increase.39. How much work is done when a block of wood is lifted with a force of 10 N to a height of 4 m?A. 2 JB. 4 JC. 10 JD. 40 J40. A force of 15-N is exerted to move a trolley at a distance of 5-m on a level road. How much worrk is done if the force applied at an angle of 300 with the horizontal?A. 56 JB. 65 JC. 5.6 JD. 6.5 J41. How much work is done in lifting a block wood of with a force of 25-N to a height of 4-m?A. 20 J B. 25 JC. 100 JD. 254 J42. A horse is towing a barge with a rope that makes an angle of 250 with a the horizontal. If the horse exerts a force of 300-N, how much work does it do in moving the barge 1.0-km?A. 272-kJB. 722-kJC. 27.2-kJD. 2.72-kJ43. A body is thrown vertically upward. Which of the following statements is not true of the body?A. its PE is maximum at the highest point.B. its KE is zero at the highest point.C. it gains both PE and KE as it goes up.D. it gains PE but loses KE.44. What is the gravitational potential energy relative to the ground when mass of 1.0 kg is 5 m above the ground?A. 49 JB. 94 JC. 9.4 JD. 4.9 J45. what is the kinetic energy of a 1000-kg car traveling at 60-km/h?A. 1.38x105 JB. 3.81x105 JC. 8.31x105 JD. 83.1x105 J46. What is the kinetic energy of a ball with a mass of 250-g, which was thrown with a velocity of 400 cm2/s2?A. 2x109 ergsB. 2x107 ergsC. 2.0x105 ergsD. 0.2x107 ergs47. In a marathon, the winner and the runner-up have the same mass. Compared with the runner-up, the winner has moreA. energyB. Force C. PowerD. Work48. The rate of doing workA. energyB. WorkC. ForceD. Power49. Dan climbs a flight of stairs in 5 min. If he weighs 250 N and the stairs is 10 m from the ground, how much power will he develop?A. 3.38 WB. 8.33 WC. 83.3 WD. 0.833 W50. How much power is developed by a jumbo jet that cruises at 250 m/s when the thrust of its engine is 100,000 N?A. 2.5x107 WB.5.2x107 WC. 25x107 WD. 0.25x107 W