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Unformatted text preview: Physics Honors Distributed By: Tyrone G Carter 2004 Tests Physics Honors Test: Chapter 4 DO NOT WRITE ON THIS TEST. SHOW WORK ON ANSWER SHEET REPORT ALL ANSWERS TO 3 SIGNIFICANT FIGURES VECTOR ANSWERS MUST HAVE MAGNITUDE AND DIRECTION USE SCIENTIFIC NOTATION WHEN APPROPRIATE FORM 1 v vavg x t a v t v f vo at F ma 2 v 2 v o 2ax f 1 x v o t at 2 2 Ffk μk FN 1 x v f t at 2 2 g = 9.8 m/s2 [D] 1 v f vo 2 x v avg t Ffs μs FN A car with a mass of 1100 kg is being pulled by a tow truck, which exerts a 200 N net force on the car. 1) If the car starts at rest, how far has it been pulled during the first 25 s the force is applied? A horizontal 100-N force is applied to a 20-kg box that is initially at rest on the floor. The coefficient of static friction between the box and the floor is 0.40, and the coefficient of kinetic friction between the box and the floor is 0.35. 2) 3) What is the acceleration of the box? What is the magnitude of the contact force acting on the box? A box is placed on an incline that makes a 40º angle with the horizontal. The coefficient of static friction between the box and the incline is 0.50, and the coefficient of kinetic friction between the box and the incline is 0.35. The box is released from rest. 4) What is the acceleration of the box? An 100-kg athlete is performing a vertical leap to test his leg strength. He crouches down, lowering his center of mass by 40 cm, and then jumps, lifting his center of mass upward by 0.90 m after he leaves the ground. 5) What force did the athlete’s legs exert on the ground when he jumped? A 25-kg mass and a 15-kg mass are suspended from either side of a pulley by a massless rope, as shown at right. Assume that the pulley is massless and frictionless. The system is released from rest. 6) 7) What is the velocity of the 15-kg block after it has moved 10 cm? What is the tension in the rope? 15-kg A 50-kg block is attached to a massless string over a frictionless, massless pulley. The other end of the string is attached to mass m, hanging from the pulley, as shown at right. The block is placed at rest on a 35º incline. The static and kinetic friction coefficients are 0.6 and 0.3, respectively. 8) What is the magnitude of the normal force acting on the block? What is the minimum possible nonzero acceleration of the system? 50 kg 25-kg s = 0.6 k = 0.3 35º m 9) 2005 Test Physics Honors Test: Chapter 4 VERSION 1 DO NOT WRITE ON THIS TEST. SHOW WORK ON ANSWER SHEET. REPORT ALL ANSWERS TO THREE SIGNIFICANT FIGURES. VECTOR ANSWERS MUST HAVE MAGNITUDE AND DIRECTION. USE SCIENTIFIC NOTATION WHEN APPROPRIATE. Distributed By: Tyrone G Carter Physics Honors Distributed By: Tyrone G Carter g = 9.8 m/s2 [D] A car with a mass of 1100 kg is being pulled by a tow truck, which exerts a 200 N net force on the car. 1) If the car starts at rest at time t = 0, at what time t has the truck moved 100 meters? A horizontal 100-N force is applied to a 20-kg box that is initially at rest on the floor. The coefficient of static friction between the box and the floor is 0.45, and the coefficient of kinetic friction between the box and the floor is 0.35. 2) What is the magnitude of the acceleration of the box? A 10-kg box is placed on an incline that makes a 40º angle with the horizontal. The coefficient of static friction between the box and the incline is 0.50, and the coefficient of kinetic friction between the box and the incline is 0.35. The box is released from rest. 3) What is the magnitude of the contact force applied on the box by the incline? A person exerts an upward force of 60 N to hold a backpack. This is the “action” force. 4) a) Describe the magnitude and direction of the reaction force. Be specific. b) Upon what object is the reaction force exerted? Be specific. c) By what object is the reaction force exerted? Be specific. A heavy box rests on the bed of a flatbed truck. When the truck accelerates, the crate remains where it is on the truck, so it, too, accelerates. 5) a) Draw a free-body diagram of the accelerating truck (not the box). Label all the forces. b) Identify the following for each force on the diagram of the truck: i. the name ii. what the force acts on iii. what exerts the force Example: “F1 is the magnetic force acting on the muskrat exerted by hamburger” A 100-kg movie stuntman falls off of a building and onto a soft landing pad. When he strikes the pad, he is moving at 5.0 m/s. He uniformly slows to a stop as he compresses the pad by a distance of 1.5 meters. 6) What force does the landing pad exert on the athlete? A 30-kg mass and a 15-kg mass are suspended from either side of a pulley by a massless rope, as shown at left. Assume that the pulley is massless and frictionless. The system is released from rest. 7) What is the tension in the rope? Distributed By: Tyrone G Carter Physics Honors Distributed By: Tyrone G Carter A child is playing with four blocks, as shown at right. She applies a force of 20 N to block A and makes all four blocks slide to the right. The blocks are initially at rest on a frictionless surface. 8) horizontal normal force acts on the 2.0-kg block? A 50-kg block is attached to a massless string over a frictionless, massless pulley. The other end of the string is attached to mass m, hanging from the pulley, as shown at right. The block is released from rest on a 35º incline. The static and kinetic friction coefficients are 0.6 and 0.3, respectively. 9) What is the minimum possible nonzero acceleration of the system? What 2006 Test Physics Honors Test: Chapter 4 FORM 1 DO NOT WRITE ON THIS TEST. REPORT ALL ANSWERS TO 3 SIGNIFICANT FIGURES. VECTOR ANSWERS MUST HAVE MAGNITUDE AND DIRECTION. USE SCIENTIFIC NOTATION WHEN APPROPRIATE x t 1 v f o vv avg 2 v a v t vf v at o F ma 12 v 2 2 vf o ax x ot at v2 2 Ffs μsF N F μkF fk N 12 x f t at v 2 g = 9.8 m/s2 [D] x vavgt A car with a mass of 1100 kg is being pulled by a tow truck. The tow truck pulls the car to the north with a constant 1200 N force, while a friction force pushes the car towards the south. Starting from rest, the truck pulls the car 60 meters toward the north in 25 seconds. 1) What is the magnitude of the friction force acting on the car? 100 N A horizontal 100-N force is applied to a 20-kg box that is initially at rest on the floor. The coefficient of static friction between the box and the floor is 0.40, and the coefficient of kinetic friction between the box and the floor is 0.35. 2) What is the magnitude of the force exerted by the ground on the box? 20 kg s = 0.40 k = 0.35 A box slides at a constant rate of 4.0 m/s down an incline that makes a 40º angle with the horizontal. 3) What is the coefficient of kinetic friction? A 100-kg athlete is performing a vertical leap to test his leg strength. He leaves the ground at 3.20 m/s, zooms upward to some maximum altitude, and then returns to the ground. As he lands, he bends his legs and crouches down, so that he moves 30 cm downward as he comes to a stop. 4) What average force did the athlete’s legs exert on the ground as he landed? Distributed By: Tyrone G Carter Physics Honors Distributed By: Tyrone G Carter A 25-kg mass and a 15-kg mass are suspended from either side of a pulley by a massless rope, as shown at right. The pulley is massless and frictionless. The masses are released from rest. 5) What is the tension in the rope after the masses are released? A person exerts an upward force of 60 N to hold a backpack. This is the “action” force. 6) a) b) c) Describe the magnitude and direction of the “reaction” force. Be specific. Upon what object does the reaction force act? Be specific. What object exerts the reaction force? Be specific. A heavy box rests on the bed of a flatbed truck. When the truck accelerates, the crate remains where it is on the truck. Therefore, the crate and the truck have the same acceleration. 7) a) Draw a free-body diagram of the accelerating truck (not the box). Label all the forces. b) Identify the following for each force on the diagram of the truck: i. the name ii. what the force acts on iii. what exerts the force Silly sample answer: “F1 is the magnetic force acting on the muskrat exerted by hamburger” A child is playing with two blocks, as shown at right. She applies a force of 10 N to the 1.0-kg block which makes both blocks slide to the right. The blocks are initially at rest10 N on a frictionless surface. 8) What horizontal normal force acts on the 1.5-kg block? 1.0 kg 1.5 kg k = 0 A 30-kg slab rests on the floor. A 10-kg block rests on top of the slab. The coefficients of friction between the various surfaces are shown to the right of the figure. The block is pulled by a horizontal force F = 75 N. 9) F slab block between block and slab: s = 0.80 k = 0.50 between slab and floor: What is the acceleration of the 30-kg slab? Show your work! s = 0.15 k = 0.10 Physics Honors Test: Chapter 4 FORM 2 DO NOT WRITE ON THIS TEST. REPORT ALL ANSWERS TO 3 SIGNIFICANT FIGURES. VECTOR ANSWERS MUST HAVE MAGNITUDE AND DIRECTION. USE SCIENTIFIC NOTATION WHEN APPROPRIATE x t 1 v f o vv avg 2 v a v t vf v at o F ma 12 v 2 2 vf o ax x ot at v2 2 12 x f t at v 2 g = 9.8 m/s2 [D] x vavgt Ffs μsF N F μkF fk N A 25-kg mass and a 10-kg mass are suspended from either side of a pulley by a massless rope, as shown at right. The pulley is massless and frictionless. The masses are released from rest. 1) What is the tension in the rope after the masses are released? A person exerts an upward force of 60 N to hold a backpack. This is the “action” force. 10-kg 2) a) b) c) Describe the magnitude and direction of the “reaction” force. Be specific. Upon what object does the reaction force act? Be specific. What object exerts the reaction force? Be specific. 25-kg A heavy box rests on the bed of a flatbed truck. When the truck accelerates, the crate remains where it is on the truck. Therefore, the crate and the truck have the same acceleration. 3) a) Draw a free-body diagram of the accelerating truck (not the box). Label all the forces. Distributed By: Tyrone G Carter Physics Honors Distributed By: Tyrone G Carter b) Identify the following for each force on the diagram of the truck: i. the name ii. what the force acts on Silly sample answer: “F1 is the magnetic force acting on the muskrat exerted by hamburger” iii. what exerts the force A child is playing with two blocks, as shown at right. She applies a force of 10 N to the 1.0-kg block which makes both blocks slide to the right. The blocks are initially at rest 10 N on a frictionless surface. 4) What horizontal normal force acts on the 2.5-kg block? 1.0 kg 2.5 kg k = 0 A car with a mass of 1100 kg is being pulled by a tow truck. The tow truck pulls the car to the north with a constant 1300 N force, while a friction force pushes the car towards the south. Starting from rest, the truck pulls the car 60 meters toward the north in 25 seconds. 5) What is the magnitude of the friction force acting on the car? A horizontal 120-N force is applied to a 20-kg box that is initially at rest on the floor. The coefficient of 120 N static friction between the box and the floor is 0.45, and the coefficient of kinetic friction between the box and the floor is 0.40. 6) What is the magnitude of the force exerted by the ground on the box? 20 kg s = 0.45 k = 0.40 A box slides at a constant rate of 4.0 m/s down an incline that makes a 35º angle with the horizontal. 7) What is the coefficient of kinetic friction? A 100-kg athlete is performing a vertical leap to test his leg strength. He leaves the ground at 2.90 m/s, zooms upward to some maximum altitude, and then returns to the ground. As he lands, he bends his legs and crouches down, so that he moves 30 cm downward as he comes to a stop. 8) What average force did the athlete’s legs exert on the ground as he landed? A 30-kg slab rests on the floor. A 10-kg block rests on top of the slab. The coefficients of friction between the various surfaces are shown to the right of the figure. The block is pulled by a horizontal force F = 75 N. 9) between block and slab: F slab block s = 0.80 k = 0.50 between slab and floor: What is the acceleration of the 30-kg slab? Show your work! s = 0.15 k = 0.10 Physics Honors Test: Chapter 4 FORM 3 DO NOT WRITE ON THIS TEST. REPORT ALL ANSWERS TO 3 SIGNIFICANT FIGURES. VECTOR ANSWERS MUST HAVE MAGNITUDE AND DIRECTION. USE SCIENTIFIC NOTATION WHEN APPROPRIATE x t 1 v f o vv avg 2 v a v t vf v at o F ma 12 x ot at v v ax v2 2 2 f 2 o 12 x f t at v 2 g = 9.8 m/s2 [D] x vavgt Ffs μsF N F μkF fk N A 20-kg mass and a 10-kg mass are suspended from either side of a pulley by a massless rope, as shown at right. The pulley is massless and frictionless. The masses are released from rest. 1) What is the tension in the rope after the masses are released? Distributed By: Tyrone G Carter 10-kg Physics Honors Distributed By: Tyrone G Carter A person exerts an upward force of 60 N to hold a backpack. This is the “action” force. 2) a) b) c) Describe the magnitude and direction of the “reaction” force. Be specific. Upon what object does the reaction force act? Be specific. What object exerts the reaction force? Be specific. A heavy box rests on the bed of a flatbed truck. When the truck accelerates, the crate remains where it is on the truck. Therefore, the crate and the truck have the same acceleration. 3) a) Draw a free-body diagram of the accelerating truck (not the box). Label all the forces. b) Identify the following for each force on the diagram of the truck: i. the name ii. what the force acts on iii. what exerts the force Silly sample answer: “F1 is the magnetic force acting on the muskrat exerted by hamburger” A child is playing with two blocks, as shown at right. She applies a force of 10 N to the 1.0-kg block which makes both blocks slide to the right. The blocks are initially at rest 10 N on a rough surface. 4) What horizontal normal force acts on the 3.0-kg block? 1.0 kg 3.0 kg k = 0.20 A car with a mass of 1100 kg is being pulled by a tow truck. The tow truck pulls the car to the north with a constant force F, while a 400-N friction force pushes the car towards the south. Starting from rest, the truck pulls the car 60 meters toward the north in 25 seconds. 5) What is the magnitude of the force F acting on the car? A horizontal 120-N force is applied to a 30-kg box that is initially at rest on the floor. The coefficient of 120 N static friction between the box and the floor is 0.65, and the coefficient of kinetic friction between the box and the floor is 0.50. 6) What is the magnitude of the force exerted by the ground on the box? 30 kg s = 0.65 k = 0.50 A box slides at a constant rate of 5.0 m/s down an incline that makes a 25º angle with the horizontal. 7) What is the coefficient of kinetic friction? A 100-kg athlete is performing a vertical leap to test his leg strength. He leaves the ground at 2.90 m/s, zooms upward to some maximum altitude, and then returns to the ground. As he lands, he bends his legs and crouches down, so that he moves 20 cm downward as he comes to a stop. 8) What average force did the athlete’s legs exert on the ground as he landed? A 30-kg slab rests on the floor. A 10-kg block rests on top of the slab. The coefficients of friction between the various surfaces are shown to the right of the figure. The block is pulled by a horizontal force F = 75 N. 9) What friction force acts on the block? between block and slab: F slab block s = 0.80 k = 0.50 between slab and floor: 2007 Test Sorry, I lost the 2007 test. s = 0.15 k = 0.10 Distributed By: Tyrone G Carter ...
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