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Vehicle Dynamics
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Newton's Second Law of Motion
The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
Damping
A force that opposes the relative motion and reduces the vibrational amplitude of mechanical systems.
Torque Vectoring
A system that uses the vehicle's brakes or power delivery to individually vary the power to each wheel, allowing for precise control of the vehicle.
Ride Height
The space between the base of your tire where it touches the ground and the underside of the vehicle.
Tire Slip Angle
The angle between the direction of the wheel is pointing and the actual direction the tire is traveling.
Electronic Stability Control (ESC)
A computerized technology that improves the safety of a vehicle's stability by detecting and minimizing skids.
Oversteer
A handling characteristic where a vehicle turns more than the amount indicated by the steering angle.
Kinetic Energy Recovery System (KERS)
A system used in motorsports and some road vehicles to recover the kinetic energy stored in a moving vehicle under braking for later use.
Camber Angle
The angle between the vertical axis of the wheels used for steering and the vertical axis of the vehicle when viewed from the front or rear.
Drag Coefficient (Cd)
A dimensionless quantity that describes an object's resistance to aerodynamic drag relative to the size of its cross-sectional area.
Ackermann Steering Geometry
A geometric arrangement of linkages in the steering of a vehicle designed to solve the problem of wheels on the inside and outside of a turn needing to trace out circles of different radii.
Unsprung Mass
The portion of a vehicle's mass that is not supported by the suspension system, including components such as tires, wheels, and brake assemblies.
Suspension System
A system in a vehicle that links the vehicle to its wheels and allows relative motion between the two.
Friction
The resistance that one surface or object encounters when moving over another.
Understeer
A handling characteristic where a vehicle tends to turn less than the amount indicated by the steering angle.
Roll Center
The point in the transverse plane around which the vehicle body rolls in a turning maneuver.
MacPherson Strut Suspension
A type of car suspension system widely used in modern vehicles where a strut combines coil spring and shock absorber into a single unit.
Sprung Mass
The portion of a vehicle's mass that is supported by the suspension system.
Yaw Rate
The rate at which a vehicle rotates about its vertical axis, measured in degrees per second.
Center of Gravity
The point in a vehicle at which the weighted average position of the mass of the vehicle is located.
Double Wishbone Suspension
A type of independent suspension design using two (occasionally parallel) wishbone-shaped arms to locate the wheel.
Anti-lock Braking System (ABS)
A safety anti-skid braking system used on aircraft and on land vehicles, such as cars, motorcycles, trucks, and buses.
Downforce
The downward force created by the aerodynamics of a vehicle, which increases the vehicle's stability and improves tire contact with the road.
Slip Ratio
The ratio of the difference in the rotational speed of the wheel and the velocity of the vehicle to the velocity of the vehicle.
Traction Control System (TCS)
A secondary function of the anti-lock braking system that is designed to prevent loss of traction of driven road wheels.
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