Chapter 2 Flashcards
______ is the ability to do work
Energy
- The brake system is used to overcome the _______________ of motion and helps stop the vehicle.
INERTIA
Mass is not the weight of the object but the amount of _______________ in that object.
MATTER
For every _______________, there is an opposite and equal _______________.
ACTION, REACTION
If the _______________ piston is larger than the _______________ piston, it exerts more force but travels a shorter distance.
OUTPUT, INPUT
- _______________ is the mathematical product of an object’s mass times its speed.
MOMENTUM
The rate of current flowing in a conductor is measured in _______________.
AMPS
- The pressure pushing the electrons through an electrical circuit is called _______________.
VOLTAGE
- Electrical resistance is measured in _______________.
OHMS
- The _______________ ____________________ ______________ becomes involved only if it senses one (or more) wheels about to lock up.
Multiple Choice
ANTI-LOCK BREAKING SYSTEM
Technician A says kinetic energy is the energy of mechanical work or motion. Technician B says when an automobile starts, accelerates, deceler- ates, and stops, kinetic energy is at work. Who is correct?
A. A only B. B only
C. Both A and B D. Neither A nor B
C. BOTH A AND B
Technician A says weight is a measurement of the number of molecules that make up an object. Technician B says mass is a measurement of the effect of gravity on that mass. Who is correct?
A. A only B. B only
C. Both A and B D. Neither A nor B
D. NEITHER A NOR B
Technician A says the weight of a car is not dis- tributed evenly on all four wheels even when the vehicle is standing still. Technician B says the position of the heavy engine and powertrain com- ponents determines weight distribution. Who is correct?
A. A only C. Both A and B
B. B only D. Neither A nor B
C. BOTH
Technician A says on a rear-wheel-drive car, about 70 percent of the weight shifts to the front. Technician B says on a front-wheel-drive car, as much as 60 percent of the car weight is shifted to the front during braking. Who is correct?
A. A only B. B only
C. Both A and B D. Neither A nor B
A. A ONLY
Technician A says a car can accelerate from 0 to 60 mph in 10 seconds. Technician B says the brake system must be able to decelerate the car from 60 to 0 mph in nearly one-fifth that time. Who is correct?
A. A only B. B only
C. Both A and B D. Neither A nor B
C. BOTH
Technician A says this chapter focuses on the friction between the brake linings and the brake rotor or drum. Technician B says to remember that the vehicle is actually stopped by the fric- tion between the tire and the road. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
C. BOTH
Technician A says a car with locked brakes has a shorter stopping distance. Technician B says this is because hot molten rubber can form between the tire and the road, causing a grabbing effect.
A. A only C. BOTH
B. B only. D. NEITHER
D. NEITHER
Two basic types of friction are brake system. These are:
A. STATIC AND DYNAMIC
B. DISC AND DRUM
C. MOVING AND STOPPING
D. KINETIC AND STATIC
D. KINETIC AND STATIC
Technician A says it takes more force to move some materials over a surface than others, even though the applied pressure and the amount of surface in contact are the same. Technician B says different materials have the same frictional char- acteristics or coefficients of friction.
A. A only C. Both A and B
B. B only D. Neither A nor B
A. A ONLY
Technician A says if pads and linings are soft and wear fast, the vehicle may have very good braking ability, but friction material life will be short. Technician B says if friction material is hard and wears slowly for long life, it will create a high coefficient of friction and good stopping ability.
A. A only B. B only
C. Both A and B D. Neither A nor B
A. A ONLY
- Briefly explain how a braking system converts one form of physical energy to another.
Mechanical energy to thermal energy through the application of friction from the brake pads
- Explain the brake system dynamic called weight transfer.
The front of the car is lowered during a hard stop caused by the vehicle weight being transferred from the rear to the front. More braking must be done by the front wheels
- Explain the difference between static and dynamic inertia.
Static is force require to overcome no movement. Dynamic is inertia of object in motion
- Explain the relationship between pressure and friction.
Directly proportional, higher the pressure the higher the friction
- Explain what the term coefficient of friction means
Numerical value that expresses amount of two objects, tensile force (motion) divided by weight force
- Explain why heat dissipation is important in a braking system and how it is removed.
Heat is a result of friction, heat is moved from the friction surface as it passes through the friction material and metal of the brake components into the air
- Briefly describe inertia.
Inertia is the resistance to a change in motion`
- Explain what happens if air is introduced into a hydraulic system.
When pressure is applied the air in the system will compress instead of transmitting movement and force effectively
- Explain how the force from a small master cylinder piston is multiplied by the caliper piston.
Pressure is inversely related to piston area, the smaller the piston the greater the pressure developed. That same pressure applied over a large area creates a mechanical advantage with more output force than input purce
- Briefly describe amperage, resistance, and voltage
- Voltage is pressure that moves electrons (current) through a wire that offers resistance to flow based on material properties
