5. Two forces are applied to a 2.0-kilogram block on a frictionless horizontal surface, as shown in the diagram below.
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1 1. The greatest increase in the inertia of an object would be produced by increasing the A) mass of the object from 1.0 kg to 2.0 kg B) net force applied to the object from 1.0 N to 2.0 N C) time that a net force is applied to the object from 1.0 s to 2.0 s D) speed of the object from 1.0 m/s to 2.0 m/s 2. When the sum of all the forces acting on a block on an inclined plane is zero, the block A) must be at rest B) must be accelerating C) may be slowing down D) may be moving at constant speed 3. The data table below lists the mass and speed of four different objects. 5. Two forces are applied to a 2.0-kilogram block on a frictionless horizontal surface, as shown in the diagram below. The acceleration of the block is A) 1.5 m/s 2 to the right B) 2.5 m/s 2 to the left C) 2.5 m/s 2 to the right D) 4.0 m/s 2 to the left Which object has the greatest inertia? A) A B) B C) C D) D 4. A man standing on a scale in an elevator notices that the scale reads 30 newtons greater than his normal weight. Which type of movement of the elevator could cause this greater-than-normal reading? A) accelerating upward B) accelerating downward C) moving upward at constant speed D) moving downward at constant speed
2 6. Which graph best represents the motion of an object in equilibrium? A) B) C) D) 7. A 4.0-kilogram object is accelerated at 3.0 meters per second 2 north by an unbalanced force. The same unbalanced force acting on a 2.0-kilogram object will accelerate this object toward the north at A) 12 m/s 2 B) 6.0 m/s 2 C) 3.0 m/s 2 D) 1.5 m/s 2 8. Four forces act concurrently on a block on a horizontal surface as shown in the diagram below. As a result of these forces, the block A) moves at constant speed to the right B) moves at constant speed to the left C) accelerate to the right D) accelerate to the left 9. Two forces, F1 and F2, are applied to a block on a frictionless, horizontal surface as shown below. If the magnitude of the block's acceleration is 2.0 meters per second 2, what is the mass of the block? A) 1 kg B) 5 kg C) 6 kg D) 7 kg 10. A 25-newton horizontal force northward and a 35-newton horizontal force southward act concurrently on a 15-kilogram object on a frictionless surface. What is the magnitude of the object's acceleration? A) 0.67 m/s 2 B) 1.7 m/s 2 C) 2.3 m/s 2 D) 4.0 m/s The diagram below shows a horizontal 8.0-newton force applied to a 4.0-kilogram block on a frictionless table. What is the magnitude of the block's acceleration? A) 0.50 m/s 2 B) 2.0 m/s 2 C) 9.8 m/s 2 D) 32 m/s Which mass would have the greatest acceleration if the same unbalanced force was applied to each? A) 1 kg B) 2 kg C) 3 kg D) 4 kg
3 13. A man weighs 900 Newtons standing on a scale in a stationary elevator. If some time later the reading on the scale is 1200 Newtons, the elevator must be moving with A) constant acceleration downward B) constant speed downward C) constant acceleration upward D) constant speed upward 14. In the graph below, the acceleration of an object is plotted against the unbalanced force on the object. What is the object's mass? A) 1 kg B) 2 kg C) 0.5 kg D) 0.2 kg 15. What is the weight of a 2.00-kilogram object on the surface of Earth? A) 4.91 N B) 2.00 N C) 9.81 N D) 19.6 N 16. An apple weighing 1 Newton on the surface of Earth has a mass of approximately A) kg B) kg C) kg D) kg 17. What is the gravitational acceleration on a planet where a 2-kilogram mass has a weight of 16 Newtons on the planet's surface? A) 1/8 m/s 2 B) 8 m/s 2 C) 10 m/s 2 D) 32 m/s The graph shows the relationship between weight and mass for a series of objects. The slope of this graph represents A) change of position B) normal force C) momentum D) acceleration due to gravity 19. The diagram below shows a 4.0-kilogram object accelerating at 10. meters per second 2 on a rough horizontal surface. What is the magnitude of the frictional force Ff acting on the object? A) 5.0 N B) 10. N C) 20. N D) 40. N 20. In the diagram below, the upward drag force acting on a parachute is equal in magnitude but opposite in direction to the weight of the parachutist and equipment. As a result of the forces shown, the parachutist may be moving A) downward with decreasing speed B) downward at constant speed C) upward with decreasing speed D) upward with constant acceleration
4 21. The diagram below represents a box shown sliding down an inclined plane. Toward which point will the force of friction on the box be directed? 23. The table below lists the coefficients of kinetic friction for four materials sliding over steel. A) 1 B) 2 C) 3 D) An 80-kilogram skier slides on waxed skis along a horizontal surface of snow at constant velocity while pushing with his poles. What is the horizontal component of the force pushing him forward? A) 0.05 N B) 0.4 N C) 40 N D) 4N A -kilogram block of each of these materials is pulled horizontally across a steel floor at constant velocity. Which block requires the smallest applied force to keep it moving at constant velocity? A) aluminum B) brass C) copper D) steel 24. Jim wishes to push a 100. N wood crate across a wood floor.what is the minimum horizontal force that would be required to start the crate moving? A) 30. N B) 42 N C) 72 N D) 100 N 25. According to your table, Approximate Coefficents of Friction, which road surface would offer the greatest traction for rubber tires? A) dry concrete B) wet concrete C) dry asphalt D) wet asphalt
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