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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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The distance travelled by revolving the wheel of a vehicle more than its circumferential movement is known as
Slip
Skid
Neither a or b
Both a and b
Skid
Skid occurs when the actual linear distance covered by a vehicle is less than the distance that would have been covered based on the wheel's rotation. In this condition, the rotational speed of the wheel is slower than the forward velocity of the vehicle, often caused by braking forces that lock the wheel.
Skid occurs when the actual linear distance covered by a vehicle is less than the distance that would have been covered based on the wheel's rotation. In this condition, the rotational speed of the wheel is slower than the forward velocity of the vehicle, often caused by braking forces that lock the wheel.
Skid=VvehicleVvehicle−Rω — where R is wheel radius and ω is angular velocity, resulting in a negative value for skid.
Skidding is defined by a negative slip value. When a wheel is locked due to braking, its circumferential velocity (vw) becomes zero while the vehicle maintains a forward velocity (v), resulting in the wheel sliding over the road surface rather than rolling. The distance the vehicle travels is greater than the distance dictated by the wheel's rotation, leading to loss of control and tire wear.
Skid happens when wheel rotation is less than linear travel.
Slip happens when wheel rotation is more than linear travel (wheel spinning).
Both conditions result in loss of traction and stability.
Skidding is primarily caused by excessive braking or low surface friction.
Reduced braking efficiency
Loss of directional control (steering)
Excessive tire tread wear
Vehicle dynamics analysis
Tire design and safety testing
| Feature | Skid | Slip |
|---|---|---|
Relationship | Vehicle Distance > Wheel Rotation | Vehicle Distance < Wheel Rotation |
Slip is often defined as the wheel spinning faster than the vehicle movement (common during rapid acceleration on loose surfaces).
Option A is incorrect because Slip refers to the excess rotational velocity relative to ground speed.
B is correct — Skidding is defined as the condition where the linear distance traveled by the vehicle exceeds the distance corresponding to the rotation of the wheels.
Always differentiate between Slip and Skid based on the velocity ratio: vw>v is slip, while v>vw is skid; these concepts are critical for understanding ABS (Anti-lock Braking System) logic.