Which of the following is true about the factors that influence traction?

• A. It depends on weather conditions
• B. It depends on tire tread depth
• C. It depends on the weight on the drive axle and the surface on which it grips
• D. It depends on engine displacement

Answer: (C)

Traction comes from friction between the tire and the surface, and the amount of pull you can transmit without slipping is governed by F ≤ μN, where μ is the surface’s grip and N is the normal load on the drive axle. Increasing the weight on the drive axle raises N, which raises the friction limit and improves traction. The surface it grips determines μ; a high-friction surface like dry pavement yields more grip than wet or icy surfaces. So the combination of how much load is on the drive axle and how well the surface grips explains why traction can be higher or lower in different situations. Weather, tire tread depth, and engine displacement influence traction in various ways, but the fundamental relationship is about normal load and surface grip, making weight on the drive axle and the gripping surface the key factors.