VFIS CORE MAIN ALL ANSWERS AND QUESTIONS
SET A+
✔✔The force that tends to make a rotating body move away from the center of a
rotation. - ✔✔Centrifugal force
✔✔The force between two surfaces rubbing together. - ✔✔Friction
✔✔The force of attraction between all masses in the universe, especially the attraction
of the earth's mass for bodies near its surface. - ✔✔Gravity
✔✔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
✔✔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 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
✔✔The driver only has two types of control : - ✔✔1. Velocity control
2. Directional control
✔✔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
SET A+
✔✔The force that tends to make a rotating body move away from the center of a
rotation. - ✔✔Centrifugal force
✔✔The force between two surfaces rubbing together. - ✔✔Friction
✔✔The force of attraction between all masses in the universe, especially the attraction
of the earth's mass for bodies near its surface. - ✔✔Gravity
✔✔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
✔✔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 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
✔✔The driver only has two types of control : - ✔✔1. Velocity control
2. Directional control
✔✔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
