Practice Test 1 Fall 2024 PDF

Test 1 Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A theory in the field of science is 1) _______ A) unchangeable. B...

Test 1 Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A theory in the field of science is 1) _______ A) unchangeable. B) a synthesis of a large body of well-tested knowledge. C) less than a fact. D) an educated guess. 2) For a scientific hypothesis to be valid, there must be a test for proving it 2) _______ A) right. B) wrong. C) conclusively one way or the other. 3) The statement, "There are regions beneath Earth's crust that will always be beyond the reach of 3) _______ scientific investigation" is A) a fact. B) a scientific statement. C) a hypothesis. D) a theory. E) speculation. 4) The first scientist to be credited for postulating that Earth circled the Sun was 4) _______ A) Newton. B) Aristotle. C) Galileo. D) Copernicus. 5) Galileo's use of inclined planes allowed him to effectively 5) _______ A) eliminate all changes in speed. B) eliminate friction. C) reduce the time of the ball's changes in speed. D) slow down the ball's changes in speed. 6) If no external forces act on a moving object, it will 6) _______ A) move slower and slower until it finally stops. B) continue moving at the same speed. C) come to an abrupt halt. D) none of the above 7) When a rocket ship gaining speed in outer space runs out of fuel, it 7) _______ A) gains speed for a short time, then slows down to a constant velocity. B) no longer gains speed. C) gains speed for a short time, slows down, and eventually stops. 8) The amount of force needed to sustain motion of a rock in outer space is 8) _______ A) a force less than its weight if friction is absent. B) a force equal to its weight. C) none of these 9) Which of the following is a vector quantity? 9) _______ A) mass B) area C) volume D) none of the above 10) A force is a vector quantity because it has both 10) ______  A) action and reaction counterparts. B) mass and velocity. C) speed and direction. D) magnitude and direction. 11) Nellie pulls with a force of 50 N on a horizontal rope tied to a tree at rest. The net force on the 11) ______ rope is A) 50 N and rope tension is also 50 N. B) zero and rope tension is 50 N. C) 50 N and rope tension is 0 N. D) zero and rope tension is also zero. 12) Which concept is being illustrated when a tablecloth is quickly yanked beneath dishes resting on 12) ______ a table? A) friction B) support force C) inertia D) equilibrium 13) The net force on any object in equilibrium is 13) ______ A) non-zero when motion is involved. B) equal to its weight. C) less than its weight. D) zero. 14) The support force on a 10-N book at rest on a table is 14) ______ A) slightly less than 10 N. B) slightly greater than 10 N. C) 10 N. D) dependent on the position of the book. 15) The speedometer of an automobile reads 15) ______ A) accelerated speed. B) instantaneous speed. C) average speed. 16) When you walk at an average speed of 4 m/s, in 5 s you'll cover a distance of 16) ______ A) 20 m. B) 10 m. C) 15 m. D) 2 m. 17) The average speed of a horse that gallops 10 kilometers in 30 minutes is 17) ______ A) 20 km/h. B) 40 km/h. C) 15 km/h. D) 30 km/h. 18) If a car increases its velocity from zero to 60 m/s in 10 seconds, its acceleration is 18) ______ A) 3 m/s2. B) 60 m/s2. C) 600 m/s2. D) 6 m/s2. 19) A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting 19) ______ point. During this time the acceleration of the ball is always A) in the direction of motion. B) directed downward. C) directed upward. D) opposite its velocity. E) none of the above 20) A rock dropped from a 5-m height accelerates at 10 m/s2 and strikes the ground 1 s later. If the 20) ______ rock is dropped from a height of 2.5 m, its acceleration of fall is A) four times as much. B) half. C) twice. D) the same. 21) The time it takes a car to attain a speed of 30 m/s when accelerating from rest at 2 m/s 2 is 21) ______ A) 30 s. B) 15 s. C) 2 s. D) 60 s. E) none of the above 22) A bullet is dropped into a river from a very high bridge at the same time as another bullet is 22) ______ fired straight downward from a rifle. Neglecting air resistance, the acceleration just before striking the water is A) greater for the fired bullet. B) greater for the dropped bullet. C) the same for each bullet. D) none of the above 23) At one instant a heavy object in air is moving upward at 50 m/s. One second later its speed is 23) ______ approximately A) 50 m/s. B) 40 m/s. C) 60 m/s. D) 55 m/s. 24) At one instant an object in free fall is moving downward at 50 m/s. One second later its speed is 24) ______ A) 100 m/s. B) 50 m/s. C) 25 m/s. D) 55 m/s. E) 60 m/s. 25) While an iron block near the Earth's surface is in free fall, it undergoes an increase in 25) ______ A) speed. B) acceleration. C) both of these D) neither of these 26) Whenever the net force on an object is zero, its acceleration 26) ______ A) may be more than zero. B) is zero. C) may be less than zero. 27) A 10-N falling object encounters 4 N of air resistance. The net force on the object is 27) ______ A) 0 N. B) 4 N. C) 10 N. D) 6 N. E) none of the above 28) An object's weight is properly expressed in units of 28) ______ A) kilograms. B) meters. C) newtons. D) cubic centimeters. 29) The mass of a lamb that weights 110 N is about 29) ______ A) 110 kg. B) 11 kg. C) 1100 kg. D) 1 kg. E) none of the above 30) A heavy ball hangs by a string, with a second string attached to its bottom. A slow pull on the 30) ______ bottom string breaks the A) bottom string. B) top string. C) top or bottom string equally. 31) A car has a mass of 1000 kg and accelerates at 2 m/s2. What net force is exerted on the car? 31) ______ A) 1000 N B) 500 N C) 2000 N D) 1500 N E) none of these 32) A tow truck exerts a force of 3000 N on a car, which then accelerates at 2 m/s 2. What is the mass 32) ______ of the car?  A) 1000 kg B) 1500 kg C) 3000 kg D) 500 kg E) none of these 33) If the mass of a cart is quickly loaded to have twice the mass while a propelling force remains 33) ______ constant, the cart's acceleration A) stays the same. B) halves. C) doubles. D) quadruples. E) none of these 34) The force required to maintain a constant velocity for an astronaut in free space is equal to 34) ______ A) the weight of the astronaut. B) the force required to stop the astronaut. C) zero. D) the mass of the astronaut. E) none of the above 35) A feather and a coin will have equal accelerations when falling in a vacuum because 35) ______ A) the force of gravity is the same for each in a vacuum. B) their velocities are the same. C) the force of gravity does not act in a vacuum. D) the ratio of both the feather's and coin's weight to mass is the same. E) none of the above 36) When a falling object has reached its terminal velocity, its acceleration is 36) ______ A) constant. B) g. C) zero. 37) Two objects of the same size, but unequal weights are dropped from a tall tower. Taking air 37) ______ resistance into consideration, the object to hit the ground first will be the A) heavier object. B) Both hit at the same time. C) lighter object. D) not enough information 38) Newton’s second law can be rearranged to show that the ……….is equal to the..... 38) ______ A) Change in momentum…… impulse B) Momentum …. Change in impulse. C) Momentum ….. impulse D) Change in momentum … change in impulse 39) The stunt person who is shot by a bandit and falls from the balcony into an air bag rather than 39) ______ onto the ground will not be hurt because the A) Momentum change is less for the air bag B) Momentum is less for the air bag C) Increased stopping time means smaller D) Impulse is less for the air bag stopping force 40) What is the impulse of a 5 N force acting for 15 s ? A)75 Ns B) 3 Ns c) 15 Ns d)20 Ns 41) A coconut and a bird's feather fall from a tree through the air to the ground below. The force of 41) ______ air resistance is A) greater on the feather. B) the same on each. C) greater on the coconut. 42) Suzie Skydiver jumps from a high-flying plane. As her velocity of fall increases, her acceleration 42) ______ A) remains unchanged regardless of air resistance. B) decreases. C) increases. 43) A skydiver steps from a helicopter and falls for a few seconds until terminal velocity is reached. 43) ______ Thereafter, until he opens his parachute, his acceleration A) is zero. B) decreases. C) increases. D) is constant. E) none of the above 44) A 500-N parachutist opens his chute and experiences an air resistance force of 800 N. The net 44) ______ force on the parachutist is then A) 500 N upward. B) 300 N upward. C) 300 N downward. D) 500 N downward. E) 800 N downward. 45) When you drop a rubber ball on the floor it bounces back. The force exerted on the ball to 45) ______ produce bouncing is by the A) floor. B) ball. C) need more information 46) A piece of rope is pulled by two people in a tug-of-war. Each exerts a 400-N force. What is the 46) ______ tension in the rope? A) 800 N B) 600 N C) 400 N D) zero E) none of the above 47) A pair of action-reaction forces always 47) ______ A) comprise a pair of interactions. B) act on the same object. C) occur simultaneously. D) all of the above E) none of the above 48) For every action force, there must be a reaction force that 48) ______ A) is slightly smaller in magnitude than the action force. B) is equal in magnitude. C) acts in the same direction. D) is slightly larger in magnitude than the action force. 49) A player catches a ball. If action is the force of the ball against the player's glove, reaction is the 49) ______ A) muscular effort in the player's arms. B) friction of the ground against the player's shoes. C) glove against the ball. D) player's grip on the glove. E) none of the above 50) An automobile and a golf cart traveling at the same speed collide head-on. The impact force is 50) ______ A) the same for both. B) greater on the golf cart. C) greater on the automobile.  1) B 2) B 3) E 4) D 5) D 6) B 7) B 8) C 9) D 10) D 11) B 12) C 13) D 14) C 15) B 16) A 17) A 18) D 19) B 20) D 21) B 22) C 23) B 24) E 25) A 26) B 27) D 28) C 29) B 30) B 31) C 32) B 33) B 34) C 35) D 36) C 37) A 38) A 39) C 40) C 41) C 42) B 43) A 44) B 45) A 46) C 47) C 48) B 49) C 50) A