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Understanding the Current Year's Lofting Rules

The key concept to grasp is terminal velocity, which is the maximum speed an object can reach as it falls through a fluid like air. This speed is determined by the balance between the force of gravity pulling the object down and the drag force resisting its motion.

At this point, the force pulling the object down (gravity) is exactly balanced by the force pushing up (air resistance or drag). This balance means the object stops speeding up and keeps falling at a steady speed. The object's shape and size matter a lot.

A parachute, for example, has a large surface area and low mass, so it reaches a low terminal velocity. A dart, with a small surface area and higher mass, reaches a much higher terminal velocity. This is why a skydiver in a spread-out position falls slower than one in a head-down position.

The rock speeds up more before air resistance balances gravity. Both eventually fall at a constant speed, but the rock’s is much faster. Understanding terminal velocity helps explain why small animals like mice can survive big falls.

Their size means air resistance is strong enough to slow them down before they hit the ground. People, on the other hand, fall too fast for air to stop them safely.

Key Points

  • Terminal velocity is the maximum speed attainable by an object as it falls through a fluid, reached when the sum of the drag force and buoyancy equals the downward force of gravity.
  • Drag force is a force acting opposite to the direction of motion of any object moving with respect to a surrounding fluid, and it depends on velocity, increasing with the square of the speed for high-speed flow.

Terms

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