Friction Quiz Latest Version | 2024/2025 | Graded A+
Friction Quiz Latest Version | 2024/2025 | Graded A+ Friction A force that opposes motion between two surfaces in contact. Two factors that affect the force of friction: Smaller contact areas - reduce friction Lower mass - reduces friction Static Friction Occurs when objects are not in motion. The force required to initiate movement must be greater than the static friction. Sliding Friction Occurs when two solid surfaces slide past each other. It helps prevent falling and slipping. This type of friction is the hardest to overcome. Rolling Friction 2 Occurs when an object rolls over a surface. Engineers use ball bearings to reduce friction in wheels. Fluid Friction Occurs when a solid object moves through a fluid (liquid or gas). This type of friction is the easiest to overcome. Methods to Increase Friction: - Roughening surfaces (e.g., adding sand on icy roads, using cleats, shoe treads, chalk on a board) - Increasing the force pressing surfaces together (e.g., slamming brakes) Methods to Reduce Friction: - Smoothing surfaces (e.g., sharpening, sanding, using lubricants like oil or grease) - Making objects more aerodynamic - Reducing the force pressing surfaces together - Switching from sliding friction to rolling or fluid friction 3 Identify the type of friction: Joe drives a tow truck down a street after heavy rain. Rolling and Fluid (and Sliding if it skids) - The truck moves through water (fluid) and rolls on the street.
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