COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 4, Problem 21QAP
To determine
The reason for wearing seat belts by driver and passengers in a car.
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The direction of the frictional force is
a.
same direction of the intended motion
O b. perpendicular to the direction of the intended motion
c. opposite direction of the intended motion
d. along the x-direction
Which of the following statements is incorrect about friction?
a. Coefficient of kinetic friction does not depend on the direction of motion.
b. Coefficient of kinetic friction depends on the normal force on the object.
c. Coefficient of kinetic friction depends on the direction of motion.
d. Coefficient of kinetic friction depends on the speed of motion.
e. Coefficient of kinetic friction depends on the acceleration of the object.
The amount of friction between two objects will depend on which of the following? *
a. The weight of the object and the surface materials of the object
b. Only the weight of the object
c. Only the surface materials of the object
d. The volume of the object
Chapter 4 Solutions
COLLEGE PHYSICS
Ch. 4 - Prob. 1QAPCh. 4 - Prob. 2QAPCh. 4 - Prob. 3QAPCh. 4 - Prob. 4QAPCh. 4 - Prob. 5QAPCh. 4 - Prob. 6QAPCh. 4 - Prob. 7QAPCh. 4 - Prob. 8QAPCh. 4 - Prob. 9QAPCh. 4 - Prob. 10QAP
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- A block of ice (m = 15.0 kg) with an attached rope is at rest on a frictionless surface. You pull the block with a horizontal force of 95.0 N for 1.54 s. a. Determine the magnitude of each force acting on the block of ice while you are pulling. b. With what speed is the ice moving after you are finished pulling?arrow_forwardAn old party trick is to pull a tablecloth out from under dishes and glasses on a table. Explain how this trick is done without pulling the dishes and glasses with the cloth.arrow_forwardYou press your physics textbook flat against a vertical wall with you hand, which applies a normal force perpendicular to the book. What is the direction of the friction force on the book due to the wall? (a) downward (b) upward (c) out from the wall (d) into the wallarrow_forward
- Give three important “laws” that characterize frictional interactions between two Solids sliding past one another.arrow_forwardIn many textbook problems, we ignore certain complications such as friction and drag. The problems contain key words that indicate such a simplification is being used. For example, if a surface is described as slippery, it means that we can ignore friction. Look at the previous chapters problem sets. Find five uses of these key words and explain how to interpret each case.arrow_forwardForensic Science Forensic science is the application of scientific techniques and methodology to discover the cause of a particular event such as an accident. Modern forensics have been used to solve historic crimes and mysteries such as the cause of death of King Tutankhamen of ancient Egypt and composer Ludwig van Beethoven in 1827. Forensic evidence is often admitted into a court case. For example, skid marks at an accident scene are used to find the initial speed of a car. Explain why skid marks are left by the car and how they may be used to find the cars initial speed.arrow_forward
- You can feel a force of air drag on your hand if you stretch your arm out of the open window of a speeding car. Note: Do not endanger yourself. What is the order of magnitude of this force? In your solution, state the quantities you measure or estimate and their values.arrow_forwardA freight train consists of two 8.00105kgengines and 45 cars with average masses of 5.50105kg . (a) What force must each engine exert backward on the track to accelerate the train at a rate of 5.0010-2m/s2if the force of friction is 7.50105Nassuming the engines exert identical forces? This is not a large frictional force for such a massive system. Rolling friction for trains is small, and consequently, trains are very energy-efficient transportation systems. (b) What is the force in the coupling between the 37th and 38th cars (this is the force each exerts on the other), assuming all cars have the same mass and that friction is evenly distributed among all of the cars and engines?arrow_forwardA freight train consists of two 8.00105 -kg engines and 45 cars with average masses of 5.50105 kg. (a) What force must each engine exert backward on the track to accelerate the train at a rate of 5.00102 m/s2 if the force of friction is 7.50105 N, assuming the engines exert identical forces? This is not a large frictional force for such a massive system. Rolling friction for trains is small, and consequently trains are very energy-efficient transportation systems. (b) What is the magnitude of the force in the coupling between the 37th and 38th cars (this is the force each exerts on the other), assuming all cars have the same mass and that friction is evenly distributed among all of the cars and engines?arrow_forward
- A box rests on the back of a truck. The coefficient of static friction between the box and the bed of the truck is 0.800. (a) When the truck accelerates forward, what force accelerates the box? (b) Find the maximum acceleration the truck can have before the box slides.arrow_forwardConsider a child holding a helium balloon in a closed car at rest. What would the child observe the balloon to do when the car (a) accelerates from rest and (b) brakes to a stop? (The balloon does not touch the roof of the car.)arrow_forwardA freight train consists of two 8.00104 -kg engines and 45 cars with average masses of 5.50104 kg. (a) What force must each engine exert backward on the track to accelerate the train at a rate of 5.00102 m/s2 if the force of friction is 7.500105 N, assuming the engines exert identical forces? This is not a large frictional force for such a massive system. Polling friction for trains is small, and consequently trains are very energy-efficient transportation systems. (b) What is the force in the coupling between the 37th and 38th cars (this is the force each exerts on the other), assuming all cars have the same mass and that friction is evenly distributed among all of the cars and engines?arrow_forward
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