VFIS CORRECT EXAMS SCRIPT ANSWERS AND
QUESTIONS SET A+
✔✔The chassis manufacturer's specified maximum load carrying capacity of an axle
system. The system includes, but is not limited to, the axle, tires, suspension, wheels,
frame, brakes, and applied engine torque. - ✔✔GAWR
✔✔GAWR : - ✔✔Gross axle weight rating
✔✔The chassis manufacturer's specified maximum load-carrying capacity for tractor-
trailer type vehicles having three or more axle system. - ✔✔Gross combination weight
rating (GCWR)
✔✔The property of an object that makes a body at rest tend to remain at rest, and a
body in motion tend to remain in uniform motion along a straight line unless acted on by
an unbalanced force. - ✔✔Inertia
✔✔Any moving load on a vehicle, such as people, water, or equipment not secured. -
✔✔Load, dynamic
✔✔Load that is exerted by the weight of the vehicle and the frame members, at rest. -
✔✔Load, static
✔✔The product of an object's mass (weight) and its velocity (speed). - ✔✔Momentum
✔✔When the front end rises while the rear falls, or vice versa, such as fore-and-aft
rocking. - ✔✔Pitch
✔✔Rotation of a vehicle about its longitudinal axis. - ✔✔Roll
✔✔A supplementary device designed to assist the braking system or a vehicle in
reducing the vehicle's speed and/or bringing it to a complete stop. - ✔✔Secondary
braking system
,✔✔Rotation about the vertical axis. A vehicle spinning out in a turn is an extreme
example. - ✔✔Yaw
✔✔___ and ___ affect the amount of control the driver has over the vehicle. -
✔✔Physical forces and vehicle characteristics
✔✔When the limits of physical forces are exceeded, the driver gives up control of the
vehicle. There are a number of vehicle characteristics that can lead to this. These
include? - ✔✔1. Driving too fast
2. Accelerating too quickly
3. Traction control
4. Braking too hard
5. Brake fade
6. Changing direction
7. Traveling through a curve
✔✔Physical forces affect the handling of a vehicle and are influenced by what? -
✔✔Mechanical and environmental forces
✔✔What five things are controlled by physics? - ✔✔1. Acceleration
2. Deceleration
3. Velocity
4. Directional control
5. Tracking
✔✔What are the four most important physical forces? - ✔✔1. Friction
2. Velocity
3. Momentum and Inertia
4. Centrifugal force
✔✔What is one of the most serious consequences of heat build-up caused by
excessive braking? - ✔✔Brake fade
✔✔What are the two most critical friction points in controlling emergency vehicles? -
✔✔1. Tires on the road
2. Brake's shoes on drums or pads on discs
✔✔What is an important ability for the emergency vehicle driver to acquire and apply? -
✔✔Smooth velocity control
✔✔The driver only has two types of control : - ✔✔1. Velocity control
2. Directional control
, ✔✔Velocity control is usually expressed as either what two things? - ✔✔1. Constant
velocity
2. Changing velocity
✔✔What is velocity? - ✔✔Speed
✔✔Directional control is a result of what three factors? - ✔✔1. Steering
2. Turning
3. Tracking
✔✔How is momentum measured? - ✔✔As the product of the object's mass, or weight,
times its velocity
momentum = mass x velocity
✔✔What two things affect velocity control? - ✔✔1. Momentum
2. Inertia
✔✔What is force a product of? - ✔✔momentum
✔✔What is the formula for force? - ✔✔Force = mass x acceleration
✔✔A doubling of speed increases centrifugal force ___. - ✔✔fourfold
✔✔What is the force, caused by inertia, that tends to make a rotating body move away
from the center of rotation? - ✔✔Centrifugal force
✔✔What does the term "dive" refer to? - ✔✔A situation in which the nose of the vehicle
dives toward the road when the driver slams on the brakes
✔✔What does the term "squat" refer to? What is an extreme squat? - ✔✔When the
vehicle accelerates, the nose comes up and the suspension drops
A wheelie
✔✔What is oversteer? - ✔✔When the driver attempts to turn, but the rear wheel close
traction and the vehicle spins out
✔✔When does neutral steer occur? - ✔✔When the vehicle tracks through a corner on
the turning circle generated by the front wheels
✔✔Cornering or lateral acceleration causes the chassis to do what? - ✔✔Roll
✔✔Acceleration and braking cause the vehicle to do what? - ✔✔Pitch
QUESTIONS SET A+
✔✔The chassis manufacturer's specified maximum load carrying capacity of an axle
system. The system includes, but is not limited to, the axle, tires, suspension, wheels,
frame, brakes, and applied engine torque. - ✔✔GAWR
✔✔GAWR : - ✔✔Gross axle weight rating
✔✔The chassis manufacturer's specified maximum load-carrying capacity for tractor-
trailer type vehicles having three or more axle system. - ✔✔Gross combination weight
rating (GCWR)
✔✔The property of an object that makes a body at rest tend to remain at rest, and a
body in motion tend to remain in uniform motion along a straight line unless acted on by
an unbalanced force. - ✔✔Inertia
✔✔Any moving load on a vehicle, such as people, water, or equipment not secured. -
✔✔Load, dynamic
✔✔Load that is exerted by the weight of the vehicle and the frame members, at rest. -
✔✔Load, static
✔✔The product of an object's mass (weight) and its velocity (speed). - ✔✔Momentum
✔✔When the front end rises while the rear falls, or vice versa, such as fore-and-aft
rocking. - ✔✔Pitch
✔✔Rotation of a vehicle about its longitudinal axis. - ✔✔Roll
✔✔A supplementary device designed to assist the braking system or a vehicle in
reducing the vehicle's speed and/or bringing it to a complete stop. - ✔✔Secondary
braking system
,✔✔Rotation about the vertical axis. A vehicle spinning out in a turn is an extreme
example. - ✔✔Yaw
✔✔___ and ___ affect the amount of control the driver has over the vehicle. -
✔✔Physical forces and vehicle characteristics
✔✔When the limits of physical forces are exceeded, the driver gives up control of the
vehicle. There are a number of vehicle characteristics that can lead to this. These
include? - ✔✔1. Driving too fast
2. Accelerating too quickly
3. Traction control
4. Braking too hard
5. Brake fade
6. Changing direction
7. Traveling through a curve
✔✔Physical forces affect the handling of a vehicle and are influenced by what? -
✔✔Mechanical and environmental forces
✔✔What five things are controlled by physics? - ✔✔1. Acceleration
2. Deceleration
3. Velocity
4. Directional control
5. Tracking
✔✔What are the four most important physical forces? - ✔✔1. Friction
2. Velocity
3. Momentum and Inertia
4. Centrifugal force
✔✔What is one of the most serious consequences of heat build-up caused by
excessive braking? - ✔✔Brake fade
✔✔What are the two most critical friction points in controlling emergency vehicles? -
✔✔1. Tires on the road
2. Brake's shoes on drums or pads on discs
✔✔What is an important ability for the emergency vehicle driver to acquire and apply? -
✔✔Smooth velocity control
✔✔The driver only has two types of control : - ✔✔1. Velocity control
2. Directional control
, ✔✔Velocity control is usually expressed as either what two things? - ✔✔1. Constant
velocity
2. Changing velocity
✔✔What is velocity? - ✔✔Speed
✔✔Directional control is a result of what three factors? - ✔✔1. Steering
2. Turning
3. Tracking
✔✔How is momentum measured? - ✔✔As the product of the object's mass, or weight,
times its velocity
momentum = mass x velocity
✔✔What two things affect velocity control? - ✔✔1. Momentum
2. Inertia
✔✔What is force a product of? - ✔✔momentum
✔✔What is the formula for force? - ✔✔Force = mass x acceleration
✔✔A doubling of speed increases centrifugal force ___. - ✔✔fourfold
✔✔What is the force, caused by inertia, that tends to make a rotating body move away
from the center of rotation? - ✔✔Centrifugal force
✔✔What does the term "dive" refer to? - ✔✔A situation in which the nose of the vehicle
dives toward the road when the driver slams on the brakes
✔✔What does the term "squat" refer to? What is an extreme squat? - ✔✔When the
vehicle accelerates, the nose comes up and the suspension drops
A wheelie
✔✔What is oversteer? - ✔✔When the driver attempts to turn, but the rear wheel close
traction and the vehicle spins out
✔✔When does neutral steer occur? - ✔✔When the vehicle tracks through a corner on
the turning circle generated by the front wheels
✔✔Cornering or lateral acceleration causes the chassis to do what? - ✔✔Roll
✔✔Acceleration and braking cause the vehicle to do what? - ✔✔Pitch
