Friction and Drag Forces

These flashcards cover key concepts related to friction and drag forces as discussed in the lecture notes.

Friction Forces

Forces that act parallel to the surface of contact between two objects, opposing relative sliding motion.

Kinetic Friction

The force that opposes the motion of two surfaces sliding past each other, represented by the equation f_k = bc_k N.

Static Friction

The force that opposes the initiation of sliding motion between two surfaces at rest, represented by f_s c4 bc_s N.

Normal Contact Force

The perpendicular force exerted by a surface on an object resting on it, denoted by N.

Coefficient of Kinetic Friction (\u03bc_k)

A dimensionless constant that represents the ratio of the force of kinetic friction to the normal force.

Coefficient of Static Friction (\u03bc_s)

A dimensionless constant that represents the ratio of the maximum force of static friction to the normal force.

Rolling Resistance Force

The force that opposes rolling motion, due to inelastic deformation of the surface and/or object.

Fluid Drag Force

The force acting on an object moving through a fluid, which can be linear or quadratic depending on speed and fluid viscosity.

Terminal Speed

The constant speed an object reaches when the drag force equals the weight of the object, resulting in zero net acceleration.

Elastic Rebound

The phenomenon where an object, after being deformed, returns to its original shape.

Stick-Slip Motion

A phenomenon where two surfaces alternately stick together and slip past each other, creating oscillations.

Quadratic Drag Equation

For high speeds in low viscosity fluids, the drag force is represented as f_d = Dv^2.

Linear Drag Equation

For low speeds in viscous fluids, the drag force is represented as f_d = bv.