Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Chapter 50, Problem 4SA
When the brakes are applied on a moving car, the frictional parts (brake or) are forced against the rotating parts of the car (brake or). The friction causes the rotating parts to slow down and stop. Just as the energy of the rotating parts is called kinetic, the friction used to stop them is called kinetic.
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Which of the following statements about friction is FALSE?
A Friction force is always less than the force required to prevent motion.
The total frictional force is dependent on the area of contact between the two surfaces.
The direction of frictional force on a surface is such as to oppose the tendency of one surface to slide relative to the
other.
The magnitude of the frictional force is equal to the force which tends to move the body till the limiting value is
D
reached.
When stopping a car on an icy or wet road... or a dry road, for that matter... is it better
to push the brake pedal hard enough to lock the wheels and make them slide? Or to push
gently so that the wheels continue to roll? What is the point behind "anti-lock disk brakes"?
Which coefficient of friction u, or uk is relevant to which case?
(hint: start by considering the forces on different points on the wheel in each case, and calculate
the largest possible deceleration for both conditions)
when two surfaces are in contact with one another, the amount of friction between them depends on the surface area.
a. true
b. false
Chapter 50 Solutions
Automotive Technology
Ch. 50 - Explain why bleeding air out of a hydraulic system...Ch. 50 - Explain why modern hydraulic braking systems are...Ch. 50 - Describe the functions of the hydraulic system...Ch. 50 - When the brakes are applied on a moving car, the...Ch. 50 - What is the purpose of the master cylinder vent...Ch. 50 - Explain why a height-sensing proportioning valve...Ch. 50 - A three-function combination valve has a brake...Ch. 50 - Explain how vacuum is used to provide a power...Ch. 50 - True or False? Metering and proportioning valves...Ch. 50 - True or False? Semimetallic brake pads still often...
Ch. 50 - The purpose of the master cylinder is to. generate...Ch. 50 - Which of the following can lead to brake hose...Ch. 50 - Which type of brake requires greater application...Ch. 50 - Which of the following is not a factor in...Ch. 50 - Which of the following could cause an extremely...Ch. 50 - A vehicles power brakes are grabbing: Technician A...Ch. 50 - While discussing what affects the amount of...Ch. 50 - The metering valve portion of a combination valve...Ch. 50 - While discussing quick take-up master cylinders:...Ch. 50 - While bleeding a brake system: Technician A...Ch. 50 - The basic frictional parts of a brake system are...Ch. 50 - Vehicle dynamics during braking are being...Ch. 50 - Pressure bleeding is being discussed: Technician A...Ch. 50 - Technician A says that the master cylinder should...Ch. 50 - The hydraulic system of the hydro-boost and...
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