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
