PYP 001 FIRST MAJOR EXAM CODE: TERM: 151 SATURDAY, OCTOBER 17, 2015 PAGE: 1
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1 TERM: 151 SATURDAY, OCTOBER 17, 2015 PAGE: 1 *Read the following (20) questions and choose the right answer: 1 The figure below represents the speed-time graph for the motion of a vehicle during a 7.0-minute trip. Which of the following statements is correct about the motion of this vehicle? A) The acceleration of the vehicle has changed several times. B) The acceleration of the vehicle has never changed. C) The vehicle has never accelerated. D) The vehicle has never stopped. E) The vehicle has never moved.
2 TERM 151 SATURDAY, OCTOBER 17, 2015 PAGE: 2 2 The position-time graph of an object s motion is represented as in the figure below. What is the average speed of this object during the 100-second motion? A) 0.40 m/s B) Zero C) 0.20 m/s D) 0.50 m/s E) 1.0 m/s 3 Which one of the following is always true about the magnitude of a displacement? A) It is less than or equal to the distance traveled. B) It is greater than the distance traveled. C) It is equal to the distance traveled. D) It is less than the distance traveled. E) None of these statements are always true.
3 TERM 151 SATURDAY, OCTOBER 17, 2015 PAGE: 3 4 A passenger rides on a train that is moving at 80.0 km/h eastward. If the passenger walks toward the back of the train at a speed of 1.2 km/h relative to the train, what would be his velocity relative to the ground? A) 78.8 km/h east. B) 78.8 km/h west. C) 81.2 km/h east. D) 81.2 km/h west. E) 80.0 km/h east. 5 A car goes from rest to a velocity of 108 km/h in 10.0 s. What is the car acceleration? A) 3.00 m/s 2 B) 10.8 m/s 2 C) 30.0 m/s 2 D) Zero E) None of these. 6 If you drop a baseball from a height of 1.5 m, it will hit the ground in 0.55 s. If you throw the baseball horizontally with a speed of 30 m/s from the same height, how long will it take the ball to hit the ground? A) 0.55 s. B) 0.35 s C) 0.75 s D) It depends on how hard the ball is thrown horizontally. E) 1.5 s 7 When a car moves with a speed of 25 m/s, its momentum is 50,000 kg.m/s. What is the mass of the car? A) 2000 kg. B) 1000 kg. C) 1500 kg. D) 2500 kg. E) None of these.
4 TERM 151 SATURDAY, OCTOBER 17, 2015 PAGE: 4 8 Which of the following sets of forces are unbalanced forces when act on an object? A) (5.0 N east, 9.8 N north, 5.6 N west, 9.8 N south) B) (20 N east, 10 N north, 20 N west, 10 N south) C) (1.7 N east, 3.5 N north, 1.7 N west, 3.5 N south) D) (6.4 N east, 10 N north, 6.4 N west, 10 N south) E) (8.5 N east, 15 N north, 8.5 N west, 15 N south) 9 What term refers to the tendency of an object to remain at rest or in uniform, straight-line motion? A) Inertia. B) Mass. C) Force. D) Momentum. E) Weight. 10 A boy pushes on a desk and the desk slides horizontally across the floor with a constant speed. If the sliding friction between the desk and the floor is 10.0 N, how much force must the boy apply to maintain the desk constant speed? A) 10.0 N. B) 10.1 N. C) 5.00 N. D) 20.0 N. E) 9.90 N. 11 If the earth were 3 times as far from the sun as it is now, the gravitational force exerted on it by the sun would be A) one-ninth as large as it is now. B) one-third as large as it is now. C) 9 times as large as it is now. D) 3 times as large as it is now. E) the same as it is now.
5 TERM 151 SATURDAY, OCTOBER 17, 2015 PAGE: 5 12 Which of the following statements is FALSE? A) When you push horizontally on a desk and the desk doesn t move, the static friction between the desk and the floor is larger than your pushing force. B) Astronauts float inside a spacecraft orbiting Earth because the spacecraft and the astronauts are all in free fall. C) Sliding friction is larger than rolling friction. D) When a car rounds a level curve, friction between the tires and the road acts as the centripetal force. E) If you throw an object in any direction it will be in free fall if there is no air resistance. 13 An astronaut has a mass of 100 kg and a weight of 327 N on another planet. The gravitational strength on that planet is A) one-third its value on earth. B) 3 times its value on earth. C) the same as on earth. D) 2 times its value on earth. E) one-half its value on earth. 14 According to Newton s second law of motion, when an object is acted upon by unbalanced forces, what can be said about its acceleration? A) It is directly proportional to the net force and inversely proportional to its mass. B) It is directly proportional to its mass. C) It is inversely proportional to the net force. D) It is directly proportional to its mass and inversely proportional to the net force. E) It can have no acceleration.
6 TERM 151 SATURDAY, OCTOBER 17, 2015 PAGE: 6 15 After a skydiver has reached his terminal velocity he opens his parachute. The air resistance is now 1180 N. If the mass of the skydiver and his parachute is 80.0 kg, his acceleration is A) 4.95 m/s 2, upward. B) m/s 2, upward. C) m/s 2, downward. D) 9.80 m/s 2, downward. E) 4.95 m/s 2, downward. 16 Suppose a 50-kg boy and a 25-kg girl use a massless rope in a tug-of-war on an icy, resistance-free surface as in the figure below. If the boy pulls the rope by 100 N, the girl can only pull by A) 100 N. B) 50 N C) 200 N D) 25 N E) 150 N. 17 How does a safety belt or an air bag reduce injuries in car crashes? A) It increases the time it takes to slow down the passenger. B) It decreases the time it takes to slow down the passenger. C) It increases the momentum of the passenger. D) It increases the force acted on the passenger. E) It increases the acceleration of the passenger.
7 TERM 151 SATURDAY, OCTOBER 17, 2015 PAGE: 7 18 Two ice-skaters stand together as illustrated in the figure below. They push off and travel directly away from each other, the boy with a velocity of 0.50 m/s to the left. If the boy mass is 45 kg and the girl mass is 35 kg, what is the girl s velocity after they push off? (Consider the ice to be frictionless.) A) 0.64 m/s to the right. B) 0.50 m/s to the right. C) 22.5 m/s to the right. D) 12.5 m/s to the right. E) None of these. 19 How much work does gravity do on a kg ball falling from a height of 10.0 m? (Neglect air resistance) A) 14.7 J. B) 1.50 J. C) 9.80 J. D) J E) 150 J
8 TERM 151 SATURDAY, OCTOBER 17, 2015 PAGE: 8 20 Which of the following is a compound machine? A) Bicycle. B) Wedge. C) Pulley. D) Screw. E) Inclined plane.
9 ID: A *Read the following (20) questions and choose the right answer: Answer Section MULTIPLE CHOICE 1 ANS: A PTS: 1 2 ANS: A PTS: 1 3 ANS: A PTS: 1 4 ANS: A PTS: 1 5 ANS: A PTS: 1 6 ANS: A PTS: 1 7 ANS: A PTS: 1 8 ANS: A PTS: 1 9 ANS: A PTS: 1 10 ANS: A PTS: 1 11 ANS: A PTS: 1 12 ANS: A PTS: 1 13 ANS: A PTS: 1 14 ANS: A PTS: 1 15 ANS: A PTS: 1 16 ANS: A PTS: 1 17 ANS: A PTS: 1 18 ANS: A PTS: 1 19 ANS: A PTS: 1 20 ANS: A PTS: 1
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