কাইনেটিক ফ্ৰিকশন

Kinetic Friction

Definition

• Kinetic friction: the force that opposes motion between two surfaces that are already in contact and sliding against each other.

Characteristics

• Kinetic friction is always parallel to the surface in contact.
• Kinetic friction always opposes motion.

Factors Affecting Kinetic Friction

• Normal Force (Fn): increased normal force increases kinetic friction.
• Surface Roughness: increased surface roughness increases kinetic friction.
• Surface Area: increased surface area in contact increases kinetic friction.
• Velocity: kinetic friction is independent of velocity (at low velocities).

Kinetic Friction Coefficient (μk)

• Definition: ratio of kinetic friction force (Fk) to normal force (Fn).
• Formula: Fk = μk * Fn.
• Values: varies depending on the surfaces in contact (e.g., μk = 0.1 for steel on steel).

Examples and Applications

• Braking systems: kinetic friction is used to slow down or stop moving objects (e.g., car brakes).
• Machine components: kinetic friction affects efficiency and wear in moving parts (e.g., gears, bearings).
• Sports: kinetic friction affects athlete performance (e.g., friction between shoes and track).

কাইনেটিক ফ্ৰিকশন হ'ল দুই পৃষ্ঠৰ মাজত ঘূর্ণন কৰাৰ বিৰোধী বল। এই কুইজত আপুনি কাইনেটিক ফ্ৰিকশনৰ সংজ্ঞা, বৈশিষ্ট্য, প্ৰভাৱক ফেক্টৰ সমূহ আৰু এই ধৰণৰ ফ্ৰিকশনৰ ব্যৱহাৰ সমূহ শিকিব পাৰিব。