20) A bird feeder with two birds has a total mass of 2.0 kilograms 25) Block A is pulled with constant velocity up an incline as shown and is supported by wire as shown in the diagram below. in the diagram below. TOP WIRE 4 160 Which arrow best represents the direction of the force of friction acting on block A? A) C) m = 2.0 kg The force in the top wire is approximately D) A) 39 N 14 N B) 20. N D) 10. N 26 A 100-newton box rests on a horizontal surface. A force of [21) An object with a mass of 0.5 kilogram starts from rest and 10 newtons parallel to the surface is required to start the box achieves a maximum speed of 20 meters per second in moving What is the maximum coefficient of static friction 0.01 second. What average unbalanced force accelerates this between the box and the surface? object? A) 10 C) 0.1 A) 0.001 N ") 10 N 3) 1000 D) 0.5 B) 0.IN D) 1,000 N 27 A horizontal force is used to pull a 5.0-kilogram cart at a 22) What is the magnitude of the net force acting on a constant speed of 5.0 meters per second across the floor as 2.0 x 105-kilogram car as it accelerates from rest to a speed of shown in the diagram below. 15 meters per second in 5.0 seconds? V= 5.0 m/s A) 3.0 x 104 N C) 6.0 x 103 N B) 6.0 x 104 N D) 2.0 x 104 N 5.0 kg . HORIZONTAL FORCE 23) A cart rolls down an inclined plane with constant speed as shown in the diagram below. Which arrow represents the direction of the frictional force? If the force of friction between the cart and the floor is 10. newtons, the magnitude of the horizontal force along the MOTION handle of the cart is A) 5.0 N C) 10. N 3) 50. N D) 25 N 28 What is the approximate mass of a chicken egg? B A) 1 x 10-1 kg C) 1 x 101 kg B) 1 x 104 kg C) C D) 1 X 102 kg A) A B) B D) D 29 Which is the most likely mass of a high school student? 24 A box decelerates as it moves to the right along a horizontal A) 250 kg C) 60 kg surface, as shown in the diagram below. 5 kg D) 1 kg 30 The approximate mass of a nickel is A) 5 kg C) 0.5 kg 3) 0.0005 kg D) 0.005 kg 31) What is the weight of the 5.0-kilogram object at the surface of Which vector best represents the force of friction on the box? the Earth? A) 5.0 kg C) 49 N A C) 3) 49 kg D) 25 N 32 A force of 50. newtons causes an object to accelerate at 10. meters per second squared. What is the mass of the object? D) A) 5.0 kg C) 500 kg B) 0.20 kg D) 60. kg33) In the graph below, the acceleration of an object is plotted against the unbalanced force on the object. 36) Two forces are applied to a 2.0-kilogram block on a frictionless, horizontal surface, as shown in the diagram below. F1 = 2.ON 2.0 kg F2 = 8.0 N THE CHONLESS SURFACE The acceleration of the block is A) 5.0 m/s to the right B) 3.0 m/s2 to the right What is the object's mass? C) 3.0 m/s2 to the left A) 0.2 kg C) 0.5 kg D) 5.0 m/s2 to the left B) 2 kg D) 1 kg 37 The graph below shows the weight of three objects on planet X 34) An 800-newton person is standing in an elevator. If the upward as a function of their mass. force of the elevator on the person is 600 newtons, the person is Weight us. Mass A) accelerating downward moving downward at constant speed 500 on Planet X B) C) at rest 400 accelerating up ward - 300 35) Two frictionless blocks, having masses of 8.0 kilograms and 2.0 kilograms, rest on a horizontal surface. If a force applied to 20 the 8.0-kilogram block gives it an acceleration of 5.0 m/sec2. 100 then the same force will give the 2.0-kilogram block an acceleration of 25 50. 75 Mass (kg) A) 20. m/sec2 C) 1.2 m/sec2 B) 10. m/sec2 D) 2.5 m/sec2 The acceleration due to gravity on planet X is approximately A) 0.17 m/s2 C) 6.0 m/s2 B) 50. m/s2 D) 9.8 m/s2 38) Each diagram below shows a different block being pushed by a force across a surface at a constant velocity. 2 kg 6 kg 4 kg 2 kg AN 3N 2 N 2 N POLISHED WOOD SMOOTH WOOD ROUGH WOOD GLASS A B In which two diagrams is the force of friction the same? A) A and B B) A and D C) C and D D) Band D 39) The graph below shows speed as a function of time for four cars, A, B, C, and D, in straight-line motion. 15.07 10.0 - CAR A CARB - -. Speed (m/s) 5.0 - CAR C. 1.0 2.0 3.0 4.0 5.0 6.0 Time (s) Which car experienced the greatest average acceleration during this 6.0-second interval? B) car B C) car C D) car D A) car A