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Drag Force
Force opposing an object's motion through a fluid.
Air Resistance
Frictional force acting against objects moving through air.
Frictional Force
Force resisting the relative motion of solid surfaces.
Driving Force
Force propelling an object forward against resistance.
Resultant Force
Net force acting on an object, determining its motion.
Constant Velocity
Motion at a fixed speed in a straight line.
Deceleration
Reduction in speed or negative acceleration.
Terminal Velocity
Maximum constant speed of a falling object.
Newton's Second Law
F = ma; relates force, mass, and acceleration.
Frictional Force Calculation
= driving force - resultant force.
Air Resistance Dependency
Depends on object's shape and speed.
Free Fall
Motion under the influence of gravity only.
Weight
Force due to gravity acting on an object.
Fluid
Substance that can flow; includes liquids and gases.
Acceleration Decrease
Occurs as drag force increases with speed.
Streamlined Posture
Position reducing air resistance for cyclists.
Velocity-Time Graph
Graph showing changes in velocity over time.
Drag Force Increase
Magnitude increases with the speed of the object.
Negligible Air Resistance
Assumed minimal effect on motion in problems.
Collision with Air Particles
Cause of air resistance during an object's fall.
Acceleration of Free Fall
approximately 9.81 m/s².
Maximum Velocity
Velocity reached when forces are balanced.
Resultant Force Zero
Condition for constant velocity in free fall.
Falling Objects
Experience weight and air resistance during descent.
