1 Physics And Measurement 2 Motion In One Dimension 3 Vectors 4 Motion In Two Dimensions 5 The Laws Of Motion 6 Circular Motion And Other Applications Of Newton’s Laws 7 Energy Of A System 8 Conservation Of Energy 9 Linear Momentum And Collisions 10 Rotation Of A Rigid Object About A Fixed Axis 11 Angular Momentum 12 Static Equilibrium And Elasticity 13 Universal Gravitation 14 Fluid Mechanics 15 Oscillatory Motion 16 Wave Motion 17 Sound Waves 18 Superposition And Standing Waves 19 Temperature 20 The First Law Of Thermodynamics 21 The Kinetic Theory Of Gases 22 Heat Engines, Entropy, And The Second Law Of Thermodynamics 23 Electric Fields 24 Gauss’s Law 25 Electric Potential 26 Capacitance And Dielectrics 27 Current And Resistance 28 Direct-current Circuits 29 Magnetic Fields 30 Sources Of The Magnetic Field 31 Faraday’s Law 32 Inductance 33 Alternating Current Circuits 34 Electromagnetic Waves 35 The Nature Of Light And The Principles Of Ray Optics 36 Image Formation 37 Wave Optics 38 Diffraction Patterns And Polarization 39 Relativity Chapter5: The Laws Of Motion
Chapter Questions Section: Chapter Questions
Problem 5.1QQ: Which of the following statements is correct? (a) It is possible for an object to have motion in the... Problem 5.2QQ: An object experiences no acceleration. Which of the following cannot be true for the object? (a) A... Problem 5.3QQ: You push an object, initially at rest, across a frictionless floor with a constant force for a time... Problem 5.4QQ: Suppose you are talking by interplanetary telephone to a friend who lives on the Moon. He tells you... Problem 5.5QQ: (i) If a fly collides with the windshield of a fast-moving bus, which experiences an impact force... Problem 5.6QQ: You press your physics textbook flat against a vertical wall with your hand. What is the direction... Problem 5.7QQ: Charlie is playing with his daughter Toney in the snow. She sits on a sled and asks him to slide her... Problem 5.1OQ: The driver of a speeding empty truck slams on the brakes and skids to a stop through a distance d.... Problem 5.2OQ: In Figure OQ5.2, a locomotive has broken through the wall of a train station. During the collision,... Problem 5.3OQ: The third graders are on one side of a schoolyard, and the fourth graders are on the other. They are... Problem 5.4OQ: The driver of a speeding truck slams on the brakes and skids to a stop through a distance d. On... Problem 5.5OQ: An experiment is performed on a puck on a level air hockey table, where friction is negligible. A... Problem 5.6OQ: The manager of a department store is pushing horizontally with a force of magnitude 200 N on a box... Problem 5.7OQ: Two objects are connected by a siring that passes over a frictionless pulley as in Figure 5.14a.... Problem 5.8OQ: An object of mass m is sliding with speed v, at some instant across a level tabletop, with which its... Problem 5.9OQ: A truck loaded with sand accelerates along a highway. The driving force on the truck remains... Problem 5.10OQ: A large crate of mass m is place on the flatbed of a truck but not tied down. As the truck... Problem 5.11OQ: If an object is in equilibrium, which of the following statements is not true? (a) The speed of the... Problem 5.12OQ: A crate remains stationary after it has been placed on a ramp inclined at an angle with the... Problem 5.13OQ: An object of mass m moves with acceleration a down a rough incline. Which of the following forces... Problem 5.1CQ: If you hold a horizontal metal bar several centimeters above the ground and move it through grass,... Problem 5.2CQ: Your hands are wet, and the restroom towel dispenser is empty. What do you do to get drops of water... Problem 5.3CQ: In the motion picture It Happened One Night (Columbia Pictures, 1934), Clark Gable is standing... Problem 5.4CQ: If a car is traveling due westward with a constant speed of 20 m/s, what is the resultant force... Problem 5.5CQ: A passenger sitting in the rear of a bus claims that she was injured when the driver slammed on the... Problem 5.6CQ: A child tosses a ball straight up. She says that the ball is moving away from her hand because the... Problem 5.7CQ: A person holds a ball in her hand, (a) Identify all the external forces acting on the ball and the... Problem 5.8CQ: A spherical rubber balloon inflated with air is held stationary, with its opening, on the west side,... Problem 5.9CQ: A rubber ball is dropped onto the floor. What force causes the ball to bounce? Problem 5.10CQ: Twenty people participate in a tug-of-war. The two teams of ten people are so evenly matched that... Problem 5.11CQ: Can an object exert a force on itself? Argue for your answer. Problem 5.12CQ: When you push on a box with a 200-N force instead of a 50-N force, you can feel that you are making... Problem 5.13CQ: A weight lifter stands on a bathroom scale. He pumps a barbell up and down. What happens to the... Problem 5.14CQ: An athlete grips a light rope that passes over a low-friction pulley attached to tire ceiling of a... Problem 5.15CQ: Suppose you are driving a classic car. Why should you avoid slamming on your brakes when you want 10... Problem 5.16CQ: In Figure CQ5.16, the light, taut, unstretchable cord B joins block 1 and the larger-mass block 2.... Problem 5.17CQ: Describe two examples in which the force of friction exerted on an object is in the direction of... Problem 5.18CQ: The mayor of a city reprimands some city employees because they will not remove the obvious sags... Problem 5.19CQ: Give reasons for the answers to each of the following questions: (a) Clan a normal force be... Problem 5.20CQ: Balancing carefully, three boys inch out onto a horizontal tree branch above a pond, each planning... Problem 5.21CQ: Identity action-reaction pairs in the following situations: (a) a man takes a step (b) a snowball... Problem 5.22CQ: As shown in Figure CQ5.22, student A, a 55-kg girl, sits on one chair with metal runners, at rest on... Problem 5.23CQ Problem 5.1P: A certain orthodontist uses a wire brace to align a patients crooked tooth as in Figure P5.1. The... Problem 5.2P: If a man weighs 900 N on the Earth, what would he weigh on Jupiter, where the free-fall acceleration... Problem 5.3P: A 3.00-kg object undergoes an acceleration given by a=(2.00i+5.00j)m/s2. Find (a) the resultant... Problem 5.4P: A certain orthodontist uses a wire brace to align a patients crooked tooth as in Figure P5.4. The... Problem 5.5P: A toy rocket engine is securely fastened to a large puck that can glide with negligible friction... Problem 5.6P: The average speed of a nitrogen molecule in air is about 6.70 102 m/s, and its mass is 4.68 1026... Problem 5.7P: The distinction between mass and weight was discovered after Jean Richer transported pendulum clocks... Problem 5.8P: (a) A cat with a mass of 850 kg in moving to the right with a constant speed of 1.44 m/s. What is... Problem 5.9P: Review. The gravitational force exerted on a baseball is 2.21 N down. A pitcher throws the ball... Problem 5.10P: Review. The gravitational force exerted on a baseball is Fgj. A pitcher throws the ball with... Problem 5.11P: Review. An electron of mass 9. 11 1031 kg has an initial speed of 3.00 105 m/s. It travels in a... Problem 5.12P: Besides the gravitational force, a 2.80-kg object is .subjected to one other constant force. The... Problem 5.13P: One or more external forces, large enough to be easily measured, are exerted on each object enclosed... Problem 5.14P: A brick of mass M has been placed on a rubber cushion of mass m. Together they are sliding to the... Problem 5.15P: Two forces, F1=(6.00i4.00j)N and F2=(3.00i+7.00j)N, act on a particle of mass 2.00 kg that is... Problem 5.16P: The force exerted by the wind on the sails of a sailboat is 390 N north. The water exerts a force of... Problem 5.17P: An object of mass m is dropped al t = 0 from the roof of a building of height h. While the object is... Problem 5.18P: A force F applied to an object of mass m1, produces an acceleration of 3.00 m/s2. The same force... Problem 5.19P: Two forces F1 and F2 act on a 5.00-kg object. Taking F1 = 20.0 N and F2 = 15.0 N, find the... Problem 5.20P: You stand on the seat of a chair and then hop off. (a) During the time interval you are in flight... Problem 5.21P: A 15.0-lb block rests on the floor. (a) What force does the floor exert on the block? (b) A rope is... Problem 5.22P: Review. Three forces acting on an object are given by F1=(2.00i2.00j)N, and F1=(5.00i3.00j)N, and... Problem 5.23P: A 1 00-kg car is pulling a 300-kg trailer. Together, the car and trailer move forward with an... Problem 5.24P: If a single constant force acts on an object that moves on a straight line, the objects velocity is... Problem 5.25P: Review. Figure P5.15 shows a worker poling a boata very efficient mode of transportation across a... Problem 5.26P: An iron bolt of mass 65.0 g hangs from a string 35.7 cm long. The top end of the string is fixed.... Problem 5.27P: Figure P5.27 shows the horizontal forces acting on a sailboat moving north at constant velocity,... Problem 5.28P: The systems shown in Figure P5.28 are in equilibrium, If the spring scales are calibrated in... Problem 5.29P: Assume the three blocks portrayed in Figure P5.29 move on a friction less surface and a 42-N force... Problem 5.30P: A block slides down a frictionless plane having an inclination of 15.0. The block starts from rest... Problem 5.31P: The distance between two telephone poles is 50.0 m. When a 1.00-kg bird lands on the telephone wire... Problem 5.32P: A 3.00-kg object is moving in a plane, with its x and y coordinates given by x = 5t2 1 and y = 3t3... Problem 5.33P: A bag of cement weighing 325 N hangs in equilibrium from three wires as suggested in Figure P5.33.... Problem 5.34P: A bag of cement whose weight is Fg hangs in equilibrium from three wires as shown in Figure P5.18.... Problem 5.35P: Two people pull as hard as they can on horizontal ropes attached to a boat that has a mass of 200... Problem 5.36P: Figure P5.36 shows loads hanging from the ceiling of an elevator that is moving at constant... Problem 5.37P: An object of mass m = 1.00 kg is observed to have an acceleration awith a magnitude of 10.0 m/s2 in... Problem 5.38P: A setup similar to the one shown in Figure P5.38 is often used in hospitals to support and apply a... Problem 5.39P: A simple accelerometer is constructed inside a car by suspending an object of mass m from a string... Problem 5.40P: An object of mass m1 = 5.00 kg placed on a frictionless, horizontal table is connected to a string... Problem 5.41P: Figure P5.41 shows the speed of a persons body as he does a chin-up. Assume the motion is vertical... Problem 5.42P: Two objects are connected by a light string that passes over a friction less pulley as shown in... Problem 5.43P: Two blocks, each of mass m = 3.50 kg, are hung from the ceiling of an elevator as in Figure P5.43.... Problem 5.44P: Two blocks, each of mass m, are hung from the ceiling of an elevator as in Figure P5.43. The... Problem 5.45P: In the system shown in Figure P5.23, a horizontal force Facts on an object of mass m2 = 8.00 kg. The... Problem 5.46P: An object of mass m1 hangs from a string that passes over a very light fixed pulley P1 as shown in... Problem 5.47P: A block is given an initial velocity of 5.00 m/s up a frictionless incline of angle = 20.0 (Fig.... Problem 5.48P: A car is stuck in the mud. A tow truck pulls on the car with the arrangement shown in Figure P5.24.... Problem 5.49P: Two blocks of mass 3.50 kg and 8.00 kg arc connected by a massless string that passes over a... Problem 5.50P: In the Atwood machine discussed in Example 5.9 and shown in Figure 5.14a, m1 = 2.00 kg and m2 = 7.00... Problem 5.51P: In Example 5.8, we investigated the apparent weight of a fish in an elevator. Now consider a 72.0-kg... Problem 5.52P: Consider a large truck carrying a heavy load, such as steel beams. A significant hazard for the... Problem 5.53P: Review. A rifle bullet with a mass of 12.0 g traveling toward the right at 260 m/s strikes a large... Problem 5.54P: Review. A car is traveling at 50.0 mi/h on a horizontal highway. (a) If the coefficient of static... Problem 5.55P: A 25.0-kg block is initially at rest oil a horizontal surface. A horizontal force of 75.0 N is... Problem 5.56P: Why is the following situation impassible? Your 3.80-kg physics book is placed next to you on the... Problem 5.57P: To determine the coefficients of friction between rubber and various surfaces, a student uses a... Problem 5.58P: Before 1960m people believed that the maximum attainable coefficient of static friction for an... Problem 5.59P: To meet a U.S. Postal Service requirement, employees footwear must haw a coefficient of static... Problem 5.60P: A woman at an airport is towing her 20.0-kg suitcase at constant speed by pulling on a strap at an... Problem 5.61P: Review. A 3.00-kg block starts from rest at the top of a 30.0 incline and slides a distance of 2.00... Problem 5.62P: The person in Figure P5.30 weighs 170 lb. As seen from the front, each light crutch makes an angle... Problem 5.63P: A 9.00-kg hanging object is connected by a light, in extensible cord over a light, frictionless... Problem 5.64P: Three objects are connected on a table as shown in Figure P5.31. The coefficient of kinetic friction... Problem 5.65P: Two blocks connected by a rope of negligible mass are being dragged by a horizontal force (Fig.... Problem 5.66P: A block of mass 3.00 kg is pushed up against a wall by a force P that makes an angle of = 50.0 with... Problem 5.67P: Review. One side of the roof of a house slopes up at 37.0. A roofer kicks a round, flat rock that... Problem 5.68P: Review. A Chinook salmon can swim underwater at 3.58 m/s, and it can also jump vertically upward,... Problem 5.69P: Review. A magician pulls a tablecloth from under a 200-g mug located 30.0 cm from the edge of the... Problem 5.70P: A 5.00-kg block is placed on top of a 10.0-kg block (Fig. P5.36). A horizontal force of 45.0 N is... Problem 5.71P: The system shown in Figure P5.49 has an acceleration of magnitude 1.50 m/s2. Assume that the... Problem 5.72AP: A black aluminum glider floats on a film of air above a level aluminum air track. Aluminum feels... Problem 5.73AP: A young woman buys an inexpensive used car stock car racing. It can attain highway speed with an... Problem 5.74AP: Why is the following situation impossible? A book sits on an inclined plane on the surface of the... Problem 5.75AP: Review. A hockey puck struck by a hockey stick is given an initial speed i in the positive x... Problem 5.76AP: A 1.00-kg glider on a horizontal air track is pulled by a string at an angle . The taut string runs... Problem 5.77AP: A frictionless plane is 10.0 m long and inclined at 35.0. A sled starts at the bottom with an... Problem 5.78AP: A rope with mass mr is attached to a block with mass mb as in Figure P5.42. The block rests on a... Problem 5.79AP: Two blocks of masses m1 and m2, are placed on a table in contact with each other as discussed in... Problem 5.80AP: On a single, light, vertical cable that does not stretch, a crane is lifting a 1 207-kg Ferrari and,... Problem 5.81AP: An inventive child named Nick wants to reach an apple in a tree without climbing the tree. Sitting... Problem 5.82AP: In the situation described in Problem 41 and Figure P5.41, the masses of the rope, spring balance,... Problem 5.83AP: In Example 5.7, we pushed on two blocks on a table. Suppose three blocks are in contact with one... Problem 5.84AP Problem 5.85AP: An object of mass M is held in place by an applied force F and a pulley system as shown in Figure... Problem 5.86AP Problem 5.87AP: Objects with masses m, = 10.0 kg and nut = 5.00 kg are connected by a light string that passes over... Problem 5.88AP: Consider the three connected objects shown in Figure P5.88. Assume first that the inclined plane is... Problem 5.89AP: A crate of weight Fg is pushed by a force P on a horizontal floor as shown in Figure P5.45. The... Problem 5.90AP: A student is asked to measure the acceleration of a glider on a frictionless, inclined plane, using... Problem 5.91AP: A flat cushion of mass m is released from rest at the corner of the roof of a building, at height h.... Problem 5.92AP: In Figure P5.46, the pulleys and pulleys the cord are light, all surfaces are frictionless, and the... Problem 5.93AP: What horizontal force must be applied to a large block of mass M shown in Figure P5.49 so that the... Problem 5.94AP: An 8.40-kg object slides down a fixed, frictionless, inclined plane. Use a computer to determine and... Problem 5.95AP: A car accelerates down a hill (Fig. P5.95), going from rest to 30.0 m/s in 6.00 s. A toy inside the... Problem 5.96CP: A time-dependent force, F = (8.00i - 4.00/j), where F is in newtons and t is in seconds, is exerted... Problem 5.97CP: The board sandwiched between two other boards in Figure P5.97 weighs 95.5 N. If the coefficient of... Problem 5.98CP: Initially, the system of objects shown in Figure P5.49 is held motionless. The pulley and all... Problem 5.99CP: A block of mass 2.20 kg is accelerated across a rough surface by a light cord passing over a small... Problem 5.100CP: Why is the following situation impossible? A 1.30-kg toaster is not plugged in. The coefficient of... Problem 5.101CP: Review. A block of mass m = 2.00 kg is released from rest at h = 0.500 m above the surface of a... Problem 5.102CP: In Figure P5.55, the incline has mass M and is fastened to the stationary horizontal tabletop. The... Problem 5.103CP: A block of mass m = 2.00 kg rests on the left edge of a block of mass M = 8.00 kg. The coefficient... Problem 5.104CP: A mobile is formed by supporting four metal butterflies of equal mass m from a string of length L.... Problem 5.35P: Two people pull as hard as they can on horizontal ropes attached to a boat that has a mass of 200...
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8. An object is pulled across a rough horizontal surface with an applied force of 300 N [40o below the horizontal]. The applied force is slowly rotated down toward the horizontal, decreasing the 40o angle. What will happen to the force of friction acting on the object and the acceleration?
Definition Definition Force that opposes motion when the surface of one item rubs against the surface of another. The unit of force of friction is same as the unit of force.
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