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Difficulty: MediumFriction and Resistance

An engineering team is evaluating the efficiency and safety of a newly designed transport vehicle. Match each mechanical situation observed during testing to the primary type of frictional resistance dominating that situation.

  • Tires resting on a steep, sloped ramp without slipping.Static friction
  • The vehicle's aerodynamic body pushing through high-speed winds.Fluid friction
  • Locked wheels skidding across a wet asphalt surface during an emergency stop.Kinetic friction
  • Cylindrical bearings allowing the axles to turn with minimal effort.Rolling friction

Answer

Tires resting without slipping match with static friction. The aerodynamic body pushing through winds matches with fluid friction. Locked wheels skidding match with kinetic friction. Cylindrical bearings match with rolling friction.
Each mechanical situation directly illustrates one of the four primary types of friction: static (no relative motion), kinetic (continuous sliding), rolling (rotating elements), and fluid (resistance through a gas or liquid).

Step-by-Step Solution

1
Analyze the sloped ramp scenario.
Identified no relative motion between the tires and the ramp.
Surfaces at rest relative to each other experience static friction.
2
Analyze the high-speed wind scenario.
Identified interaction between a solid moving body and a gas (air).
Gases and liquids behave as fluids, meaning aerodynamic drag is a form of fluid friction.
3
Analyze the emergency stop scenario.
Identified the tires locking and sliding continuously across the pavement.
Active sliding between two solid surfaces characterizes kinetic friction.
4
Analyze the axle bearing scenario.
Identified cylindrical elements rotating to facilitate movement.
The rotation of cylinders or spheres between surfaces is the defining characteristic of rolling friction.

Key Concept

Frictional Resistance Types and Applications
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Topics

Friction and Resistance

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