Slide 1 / 43 1 After firing a cannon ball a cannon moves in opposite direction from the ball. This an example of Newton’s First law A Newton’s Second Law B Newton’s Third Law C Newton’s Law of Gravitation D None of the above E Slide 2 / 43 2 In the absence of an external force a moving object will slow down and come to a stop A B speed up move with a constant speed in a long a straight C line turn to the right D turn to the left E Slide 3 / 43 3 A passenger standing in a moving bus, facing forward suddenly falls forward. This can be an indication which of the following? The bus speeds A B The bus slows down The bus doesn’t change its velocity C The bus turns to the right D The bus turns to the left E
Slide 4 / 43 4 A heavy box sits on a floor. Which of the following about the net force on the box is true? Non-zero vector pointing up A Non-zero vector pointing down B Non-zero vector pointing left C D Non-zero vector pointing right It is zero E Slide 5 / 43 5 A loaded truck collides with a car causing a huge damage to the car. Which of the following is true about the collision? The force on the truck is greater than the force A The force on the car is greater than the force on B the truck The force on the truck is the same in magnitude C as the force on the car During the collision the truck makes greater D displacement than the car During the collision the truck has greater E acceleration than the car Slide 6 / 43 6 The Earth pulls down on a railroad wagon with a force of 200 kN. Which of the following is the “reaction force”? The wagon pulls up the A Earth with 200 kN The wagon pushes down B the railroad with 200 kN The railroad pushes up the C wagon with 200 kN The buoyant force pushes up the wagon with D 200 kN The wagon pushes down the Earth with 200 kN E
Slide 7 / 43 7 A railroad wagon pushes down on a railroad with a force of 200 kN. Which of the following is the “reaction force”? The wagon pulls up the Earth A with 200 kN The wagon pushes down the B railroad with 200 kN C The railroad pushes up the wagon with 200 kN The buoyant force pushes up the wagon with D 200 kN The wagon pushes down the Earth with 200 kN E Slide 8 / 43 8 Which of the following is true about an astronaut’s weight on the surface of Moon compare to Earth? Weight is the same, mass is less A B Weight is less, mass is the same Weight is less, mass is less C Weight is less, mass is greater D Weight is greater, mass is the same E Slide 9 / 43 9 An object is thrown straight up. How do we compare the net force on the object to its weight when it is on the highest point at the path? A It is greater than the weight It is slightly less than the weight B It is zero C It is equal to the weight D It can’t be determine E
Slide 10 / 43 In the diagram below, a block of mass m slides down an inclined plane with a constant speed at an angle θ with respect to the horizontal. Use this diagram for questions 10 through 14. 10 What is the x-component of the gravitational force? A mg cosθ mg sinθ B mg tanθ C mg D Zero E Slide 11 / 43 11 What is the y-component of the gravitational force? mg cosθ A B mg sinθ mg tanθ C mg D Zero E Slide 12 / 43 12 What is the normal force applied to the block? mg cosθ A mg sinθ B mg tanθ C mg D Zero E
Slide 13 / 43 13 What is the kinetic friction force applied to the block? µmg cosθ A µmg sinθ B µmg tanθ C D µmg Zero E Slide 14 / 43 14 Which of the following is true about the coefficient on kinetic friction? µ = cosθ A B µ = sinθ µ = tanθ C µ = mg D Zero E Slide 15 / 43 15 Which of the following diagrams best represents the gravitational force W, the frictional force f, and the normal force N that act on the block? A B D C A block with a mass m = 5 kg slides down an inclined plane with an angle θ = E 37°. The block maintains a constant acceleration a = 5.6 m/s 2 . (sin37° = 0.6, cos37° = 0.8). The coefficient of kinetic friction between the block and the inclined surface is 0.05.
Slide 16 / 43 16 What is the normal force on the block? 50 N A B 40 N 30 N C 20 N D A block with a mass m = 5 kg slides 10 N E down an inclined plane with an angle θ = 37°. The block maintains a constant acceleration a = 5 m/s 2 . (sin37° = 0.6, cos37° = 0.8). The coefficient of kinetic friction between the block and the inclined surface is 0.05. Slide 17 / 43 17 What is the friction force between the block and inclined plane? 2 N A B 5 N 6 N C 30 N D A block with a mass m = 5 kg slides down an inclined plane with an angle θ 40 N E = 37°. The block maintains a constant acceleration a = 5 m/s 2 . (sin37° = 0.6, cos37° = 0.8). The coefficient of kinetic friction between the block and the inclined surface is 0.05. Slide 18 / 43 18 A system of two blocks is accelerated by an applied force of magnitude F on the frictionless horizontal surface. The tension in the string between the blocks is: 3F A 5F B C 3/8 F 1/3 F D 1/5 F E
Slide 19 / 43 19 A student pulls a wooden box along a rough horizontal floor at constant speed by means of a force P as shown to the right. Which of the following must be true? P > f and N < W A B P > f and N = W P = f and N > W C P = f and N = W D P < f and N = W E Slide 20 / 43 20 A boy pushes a sled of mass m across a rough horizontal surface by applying a force of magnitude F directed at angle θ. The coefficient of kinetic friction between the sled and the surface is μ. The normal force on the sled is: mg A B mg sinθ C mg cosθ mg + F sinθ D mg – F sinθ E Slide 21 / 43 21 A boy pushes a sled of mass m across a rough horizontal surface by applying a force of magnitude F directed at angle θ. The coefficient of kinetic friction between the sled and the surface is θ.The frictional force on the sled is: A μ(mg + Fsinθ) μ (mg-Fsin θ ) B μ (mg+ Fcos θ ) C μ (mg-Fcos θ ) D μmg E
Slide 22 / 43 22 A block of mass m is pulled along a horizontal surface at constant speed v by a force Fapp , which acts at an angle of θ with the horizontal. The coefficient of kinetic friction between the block and the surface is μ.The normal force exerted on the block by the surface is: A mg - F app cosθ B mg - F app sinθ mg C mg + F app sinθ D E mg + F app cosθ Slide 23 / 43 23 A block of mass m is pulled along a horizontal surface at constant speed v by a force Fapp , which acts at an angle of ( with the horizontal. The coefficient of kinetic friction between the block and the surface is (.The friction force on the block is: μ(mg - F app cosθ) A μ(mg-F app sinθ) B C μmg D μ(mg + F app sinθ) μ(mg + F app cosθ) E Slide 24 / 43 24 An ideal spring obeys Hooke's law, F = -kx. A mass of 0.30 kg hung vertically from this spring stretches the spring 0.015 m. The value of the spring constant is nearly A 150 N/m 200 N/m B C 300 N/m 250 N/m D 350 N/m E
Slide 25 / 43 25 Two blocks are attached by a compressed spring and are initially held at rest on a frictionless surface. The blocks are then released simultaneously. If block I has four times the mass of block II, which of the following quantities is the same for both blocks as the spring pushes the two blocks away from each other? Speed A B Velocity C Acceleration Displacement D Force on each block E Slide 26 / 43 26 The two spheres have equal densities and are subject only to their mutual gravitational attraction. Which of the following quantities must have the same magnitude for both spheres? Acceleration A B Velocity Kinetic Energy C Displacement from the center of mass D E Gravitational force Slide 27 / 43 27 A block of mass 4m can move without friction on a horizontal table. This block is attached to another block of mass m by a string that passes over a frictionless pulley. If the masses of the string and the pulley are negligible, what is the magnitude of the acceleration of the descending block? A g/5 B g/4 g/3 C D 2g/3 E g
Slide 28 / 43 28 Three forces act on an object. Which of the following is true in order to keep the object in translational equilibrium? I. The vector sum of the three forces must equal zero. II. The magnitudes of the three forces must be equal. III. All three forces must be parallel. I only A B II only C I and III only II and III only D I, II, and III E Slide 29 / 43 29 Three objects can only move along a straight, level path. The graphs below show the position d of each of the objects plotted as a function of time t. The net force on the object is zero in which of the cases? II only A B III only I and II only C I and III only D I, II, and III E Slide 30 / 43 30 A locomotive is pulling an empty freight car with a constant acceleration on a horizontal surface. The mass of the locomotive is five times the mass of the car. Which statement is true about the force applied by the car on the locomotive? 5 times greater than the force of the locomotive A on the car 5 times less than the force of the locomotive on B the car Zero since they move with a constant C acceleration Equal to the force of the locomotive on the car D More information is required E
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