AP Physics 1 Practice Questions PDF

AP Physics 1 Practice Questions Unit 2B: 2d Forces and Circular Motion Multiple Choice 2. 1. A ball of mass m is suspended fr...

AP Physics 1 Practice Questions Unit 2B: 2d Forces and Circular Motion Multiple Choice 2. 1. A ball of mass m is suspended from two strings of unequal length as shown above. The tensions T1 and T2 in the strings must satisfy which of the following relations? (A) T1 = T2 (B) T1 > T2 (C) T1 < T2 Block A hangs from a light string that passes over a light pulley and is attached to block B, (D) T1 + T2 = mg which is on a level horizontal frictionless table, as shown above. Students are to determine the 3. mass of Block B from the motion of the two-block system after it is released from rest. They plan to measure the time block A takes to reach the floor. The students must also take which of the following measurements to When the frictionless system shown above is determine the mass of block B? accelerated by an applied force of magnitude F the tension in the string between the blocks is (A) Only the mass of block A (A) F (B) Only the distance block A falls to reach the 2 floor (B) 3 𝐹 (C) Only the mass of block A and the distance (C) 1 𝐹 2 block A falls to reach the floor 1 (D) The mass of block A, the distance block A (D) 3 𝐹 falls to reach the floor, and the radius of the pulley. 1 Some content copyright © 1984-2016 by College Entrance Examination Board. All rights reserved. AP Physics 1 Practice Questions Unit 2B: 2d Forces and Circular Motion Diagram for questions 4 and 5 6. Three forces act on an object. If the object is in translational equilibrium, which of the following must be true? I. The vector sum of the three forces must equal zero. II. The magnitudes of the three forces must A 2-kilogram block slides down a 30° incline as be equal. shown above with an acceleration of 2 meters per III. All three forces must be parallel. second squared. (A) I only 4. Which of the following diagrams best represents the gravitational force W. the frictional force f, (B) II only and the normal force N that act on the block? (C) I and III only (D) I, II, and III 7. A uniform rope of weight 50 N hangs from a 5. The magnitude of the frictional force along the hook as shown above. A box of weight 100 N plane is most nearly hangs from the rope. What is the tension in the (A) 2.5 N rope? (B) 5 N (A) 50 N throughout the rope (C) 6 N (B) 100 N throughout the rope (D) 10 N (C) 150 N throughout the rope (D) It varies from 100 N at the bottom of the rope to 150 N at the top. 2 Some content copyright © 1984-2016 by College Entrance Examination Board. All rights reserved. AP Physics 1 Practice Questions Unit 2B: 2d Forces and Circular Motion 8. 9. A push broom of mass m is pushed across a A block of weight W is pulled along a rough horizontal floor by a force of magnitude T horizontal surface at constant speed v by a force directed at angle θ as shown above. The F, which acts at an angle of θ with the coefficient of friction between the broom and horizontal, as shown above. The normal force the floor is μ. The frictional force on the broom exerted on the block by the surface has has magnitude magnitude (A) μ(𝑚𝑔 + 𝑇𝑠𝑖𝑛θ) (A) 𝑊 − 𝐹𝑐𝑜𝑠θ (B) μ(𝑚𝑔 − 𝑇𝑠𝑖𝑛θ) (B) 𝑊 − 𝐹𝑠𝑖𝑛θ (C) μ(𝑚𝑔 + 𝑇𝑐𝑜𝑠θ) (C) 𝑊 (D) μ𝑚𝑔 (D) 𝑊 + 𝐹𝑐𝑜𝑠θ 3 Some content copyright © 1984-2016 by College Entrance Examination Board. All rights reserved. AP Physics 1 Practice Questions Unit 2B: 2d Forces and Circular Motion 10. Diagram for questions 12 and 13 When an object of weight W is suspended from A plane 5 meters in length is inclined at an angle of the center of a massless string as shown above. 37°, as shown above. A block of weight 20 N is the tension at any point in the string is placed at the top of the plane and allowed to slide down. (A) 2𝑊𝑐𝑜𝑠θ 𝑊𝑐𝑜𝑠θ 12. The mass of the block is most nearly (B) 2 (A) 1.0 kg 𝑊 (C) 2𝑐𝑜𝑠θ (B) 1.2 kg 𝑊 (C) 1.6 kg (D) 𝑐𝑜𝑠θ (D) 2.0 kg 11. 13. The magnitude of the normal force exerted on the block by the plane is most nearly (A) 10 N (B) 12 N (C) 16 N A block of mass 3m can move without friction on a horizontal table. This block is attached to (D) 20 N another block of mass m by a cord that passes over a frictionless pulley, as shown above. If the masses of the cord and the pulley are negligible, what is the magnitude of the acceleration of the descending block? (A) zero (B) g/4 (C) g/3 (D) g 4 Some content copyright © 1984-2016 by College Entrance Examination Board. All rights reserved. AP Physics 1 Practice Questions Unit 2B: 2d Forces and Circular Motion 14. (D) the motion depends on the amount of mass. 16. An object of mass m is initially at rest and free to move without friction in any direction in the xy-plane. A constant net force of magnitude F directed in the +x direction acts on the object for The cart of mass 10 kg shown above moves 1 s. Immediately thereafter a constant net force without frictional loss on a level table. A 10 N of the same magnitude F directed in the +y force pulls on the cart horizontally to the right. direction acts on the object for 1 s. After this, no At the same time a 30 N for at an angle of 60° forces act on the object. Which of the following above the horizontal pulls on the cart to the left. vectors could represent the velocity of the object What is the magnitude of the horizontal at the end of 3 s, assuming the scales on the x acceleration of the cart? and y axes are equal. (A) 0.5 m/s2 (B) 1.6 m/s2 (C) 2.0 m/s2 (D) 2.5 m/s2 15. 17. When a person stands on a rotating merry go In the figure above, two identical masses, round, the frictional force exerted on the person attached by a massless cord passing over a massless frictionless pulley. When released… by the merry go round is (A) greater in magnitude than the frictional force (A) the higher mass will move downward. exerted on the merry go round by the person (B) the lower mass will move downward. (B) opposite in direction to the frictional force (C) the masses will not move. exerted on the merry go round by the person (C) directed away from the center of the merry go round 5 Some content copyright © 1984-2016 by College Entrance Examination Board. All rights reserved. AP Physics 1 Practice Questions Unit 2B: 2d Forces and Circular Motion (D) independent of the person's mass 20. A ball attached to a string is whirled around in a horizontal circle having a radius r. If the 18. Each of four satellites makes a circular orbit centripetal force is nine times bigger, but the about an object that is much more massive than radius of the circle is unchanged, the new speed any of the satellites. The mass and orbital radius of the ball is which of the following? of each satellite are given below. Which satellite (A) One third the original speed has the greatest speed? (B) One ninth the original speed Mass Radius (C) Three times the original speed (A) m ½R (D) Nine times the original speed (B) m R 21. An object weighing 4 Newtons swings on the (C) m 2R end of a string as a simple pendulum. At the (D) 2m` R bottom of the swing, the tension in the string is 6 newtons. What is the magnitude of the centripetal acceleration of the object at the bottom of the swing? (A) 5 m/s2 (B) 10 m/s2 (C) 15 m/s2 19. A racing car is moving around the circular track (D) 25 m/s2 of radius 300 meters shown above. At the instant when the car's velocity is directed due 22. In which of the following situations is an object east, its acceleration is directed due south and accelerating? has a magnitude of 3 meters per second squared. I. It moves in a straight line at constant speed. When viewed from above, the car is moving (A) clockwise at 30 m/s II. It moves in uniform circular motion. (B) clockwise at 10 m/ s III. It travels as a projectile in a gravitational field with negligible air resistance. (C) counterclockwise at 30 m/ s (A) I only (D) counterclockwise at 10 m/s (B) III only (C) I and II only (D) II and III only 6 Some content copyright © 1984-2016 by College Entrance Examination Board. All rights reserved. AP Physics 1 Practice Questions Unit 2B: 2d Forces and Circular Motion The following figure applies to questions 23 and 24. (D) 23. 25. An automobile moves at constant speed down one hill and up another hill along the smoothly curved surface shown above. Which of the following diagrams best represents the The horizontal turntable shown above rotates at a directions of the velocity and the acceleration of constant rate. As viewed from above, a coin on the the automobile at the instant that it is at the turntable moves counterclockwise in a circle as lowest position. as shown? shown. Which of the following vectors best represents the direction of the velocity of the coin (A) when the coin is in the position shown? (A) (B) (B) (C) (D) (C) 24. Which of the following vectors best represents the direction of the acceleration of the coin when the coin is in the position shown? (A) (B) (D) (C) 7 Some content copyright © 1984-2016 by College Entrance Examination Board. All rights reserved. AP Physics 1 Practice Questions Unit 2B: 2d Forces and Circular Motion 26. A car initially travels north and then turns to the left along a circular curve. This causes a package on the seat of the car to slide toward the right side of the car. Which of the following is true of the net force on the package while it is sliding? (A) The force is directed away from the center of the circle. (B) There is not enough force directed north to keep the package from sliding. (C) There is not enough force tangential to the car's path to keep the package from sliding. (D) There is not enough force directed toward the center of the circle to keep the package from sliding. 27. A block released from rest at position A slides with negligible friction down an inclined track, around a vertical loop, and then along a horizontal portion of the track, as shown above. The block never leaves the track. Which of the following is true of the net force on the block when it is at position C ? (A) It is directed vertically downward only. (B) It is directed to the left only. (C) It is directed to the right only. (D) It has components both to the left and vertically downward. 8 Some content copyright © 1984-2016 by College Entrance Examination Board. All rights reserved. AP Physics 1 Practice Questions Unit 2B: 2d Forces and Circular Motion 28. A planet of mass m orbits a star of mass M, where m