Slide 1 / 41 AP Physics C Dynamics Multiple Choice www.njctl.org Slide 2 / 41 1 After firing a cannon ball, the cannon moves in the opposite direction from the ball. This an example of: A Newton’s First Law B Newton’s Second Law C Newton’s Third Law D Newton’s Law of Gravitation E None of the above Slide 3 / 41 2 In the absence of an external force a moving object will A slow down and come to a stop B speed up C move with a constant speed in a straight line D turn to the right E turn to the left
Slide 4 / 41 3 A loaded truck collides with a car causing a large amount of damage to the car. Which of the following is true about the collision? A The force on the truck is greater than the force on the car. B The force on the car is greater than the force on the truck C The force on the truck is the same in magnitude as the force on the car D During the collision, the truck has a greater displacement than the car E During the collision, the truck has a greater acceleration than the car Slide 5 / 41 4 An object is thrown straight up. How do we compare the net force on the object to its weight when it is at the highest point in the path? A It is greater than the weight B is slightly less than the weight C is zero D It is equal to the weight E It can’t be determined Slide 6 / 41 5 An elevator car weighs 5500 N. If the car accelerates upwards at a rate of 4.0 m/s 2 , what is the tension in the support cable lifting the car? Use g = 10 m/s 2 . A 1600 N B 3300 N C 4400 N D 7700 N E 8700 N
Slide 7 / 41 6 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 sliding down the inclined plane as shown above? B A C E D Slide 8 / 41 7 A block with a mass m = 5 kg slides down an inclined plane with an angle θ = 37°. The block maintains a constant acceleration a = 5.6 m/s2. (sin37° = 0.6, cos37° = 0.8). The coefficient of kinetic friction between the block and the inclined surface is 0.05. What is the normal force on the block? A 50 N B 40 N C 30 N D 20 N E 10 N Slide 9 / 41 8 A block with a mass m = 5 kg slides down an inclined plane with an angle θ = 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. What is the friction force between the block and inclined plane? A 2 N B 5 N C 6 N D 30 N E 40 N
Slide 10 / 41 9 The coefficient of static friction between the block and the inclined plane is 0.4 and θ=25 0 . The block is placed on the inclined plane. The block will: A not move B start moving down the incline and then stop before it reaches the bottom of the incline C start moving down the incline and continue to increase its velocity D start moving and increase its acceleration until it reaches the bottom of the incline E start moving and then its acceleration will decrease Slide 11 / 41 10 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: A 3 F B 5 F C 3/8 F D 1/3 F E 1/5 F Slide 12 / 41 11 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? A P > f and N < W B P > f and N = W C P = f and N > W D P = f and N = W E P < f and N = W
Slide 13 / 41 12 As shown below, a boy pushes a sled of mass m across a rough horizontal surface by applying a force of magnitude F directed at an angle θ. The normal force on the sled is: A mg B mg sinθ C mg cosθ D mg + F sinθ E mg – F sinθ Slide 14 / 41 13 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 normal force exerted on the block by the surface is: A mg - Fapp cosθ B mg - Fapp sinθ C mg D mg + Fapp sinθ E mg + Fapp cosθ Slide 15 / 41 14 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 meter. The value of the spring constant is nearly A 150 N/m B 200 N/m C 300 N/m D 250 N/m E 350 N/m
Slide 16 / 41 15 A block with a mass m is placed on the top of an identical block m and the system of two blocks is at rest on a rough horizontal surface as shown below. The top block is tied to the wall. The coefficient of static friction between all surfaces is µ s . What maximum value does force F reach before the lower block starts sliding to the left? A 3 µ s mg B 2 µ s mg C 4 µ s mg D ½ µ s mg E ¼ µ s mg Slide 17 / 41 16 Three blocks connected with each other by two light strings. The blocks have different masses m 2 > m 3 >m 1 . The heaviest of three blocks is placed on a frictionless table. The system of three blocks is released from rest. What is the acceleration of block m 2 ? A (m 2 - m 3 - m 1 )g/(m 1 + m 2 + m 3 ) B (m 1 - m 3 - m 2 )g/(m 1 + m 2 + m 3 ) C (m 3 - m 1 )g/(m 1 + m 2 + m 3 ) D (m 3 - m 2 - m 1 )g/(m 1 + m 2 + m 3 ) E (m 1 - m 3 )g/(m 1 + m 2 + m 3 ) Slide 18 / 41 17 A lamp of mass m is suspended from two cables of unequal length as shown to the right. Which of the following is true about the tensions T 1 and T 2 in the cables? A T 1 > T 2 B T 1 = T 2 C T 2 > T 1 D T 1 - T 2 = mg E T 1 + T 2 = mg
Slide 19 / 41 18 A ball of mass m is suspended from two massless strings of an equal length as shown below. The tension force in each string is: A ½ mgcosθ B 2mgcosθ C mgcosθ D mg/(cosθ ) E mg/(2cosθ ) Slide 20 / 41 19 A ball moves horizontally with an initial velocity vo, as shown above. It is then struck by a tennis racket. After leaving the racket, the ball moves with a velocity v. Which of the following vectors best represents the direction of the average force that the racket exerts on the ball? A B C D E Slide 21 / 41 20 A marble of mass m moves along a path with a speed defined by the function v = bt 2 + c, where t is time and b and c are constants. What is the magnitude F of the net force on the particle at time t = t 1 ? bt 1 2 + c A 3mbt 1 + 2c B mbt 1 C mbt 1 + c D 2mbt 1 E
Slide 22 / 41 21 The position as a function of time of a moving object is given by the formula x = 2t 3 - 3t 2 + 4t. At what time the net force on the object is zero? A 0.5 s B 1.0 s C 1.5 s D 1.8 s E 2.2 s Slide 23 / 41 22 The velocity as a function of time of a moving object is shown by the graph. Which of the following graphs best represents the magnitude of the net force exerted on the object as a function of time? B A E D C Slide 24 / 41 23 A box of 50 kg is pulled up from rest by a cable. The tension force in the cable is 600 N. What is the box’s velocity after it covers vertical distance of 16 m? A 4 m/s B 8 m/s C 12 m/s D 16 m/s E 20 m/s
Slide 25 / 41 24 An Atwood machine is presented by the diagram. What is the magnitude of the acceleration of 0.5 kg block? A 6 m/s 2 B 4 m/s 2 C 2 m/s 2 D 1 m/s 2 E 0.5 m/s 2 Slide 26 / 41 25 A 12 kg sphere is supported by two ropes AB and BC. What is the tension force in rope BC? A 120 N B 160 N C 180 N D 200 N E 240 N Slide 27 / 41 26 A 12 kg sphere is supported by two ropes AB and BC. What is the tension force in rope AB? A 120 N B 160 N C 180 N D 200 N E 240 N
Slide 28 / 41 27 A small sphere is attached to a light string that can move in a vertical circle. The sphere is released from point 1 and describes a semicircle when it reaches point 2. What are the directions of the acceleration vector at point 1 and point 2? Point 1 Point 2 A Downward Upward B Downward To the right C Upward Upward D To the right Upward E To the right Downward Slide 29 / 41 28 A particle moves along a curved path from point 1 to point 2. Which of the following diagrams indicates a possible combination of the net force, acceleration and velocity of the particle? B C A E D Slide 30 / 41 29 A 12 kg block is suspended from two light, identical springs. When the block is in equilibrium the springs stretch by 30 cm. What is the spring constant of each spring? A 50 N/m B 100 N/m C 120 N/m D 160 N/m E 200 N/m
Slide 31 / 41 30 What minimum force is required to move 10 kg block up the inclined plane with an angle of 37 ° above the horizontal? The coefficient of kinetic friction between the block and the inclined surface is 0.2. A 76 N B 54 N C 42 N D 36 N E 28 N Slide 32 / 41 Slide 33 / 41 32 In the physics lab, a student performs an experiment with a double- sided spring gun. When the spring is compressed and then released it can fire two rubber balls m 1 and m 2 at the same time. From this experiment the student was able to measure only the acceleration of each ball a 1 and a 2 . Based on this information, which of the following can be determined? A m 1 and m 2 only B Spring force F only C Spring Force F, m 1 and m 2 D Ratio of m 1 and m 2 only E Ratio of m 1 and m 2 , and spring force F only
Recommend
More recommend
