Key Concepts in Air Resistance and Gravity

  • Air Resistance

    • A force that opposes an object's motion in the air.

  • Gravity

    • An attractive force that pulls objects toward each other, specifically Earth, for objects near its surface.

  • Terminal Velocity

    • The constant speed reached by a free-falling object when the force of gravity is equal to the force of air resistance.

  • Skydiver Example

    • Initially, as a skydiver falls, gravity accelerates them downward while air resistance pushes upward.
    • When the forces of air resistance and gravity balance, the skydiver stops accelerating and reaches terminal velocity.

  • Parachute Effect

    • When a parachute opens, the surface area increases significantly.
    • This increases air resistance, which reduces the skydiver's speed.
    • Gravity's pull changes little during this process.

  • Key Concepts

    • Acceleration occurs as speed increases until terminal velocity is reached.