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Air Resistance. Air Resistance. What two forces are acting on an object when it falls? Gravity Air resistance. Air Resistance. Imagine dropping two pieces of paper. One is crumpled and the other is flat. Which one will reach the ground faster and why?

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air resistance1
Air Resistance
  • What two forces are acting on an object when it falls?
  • Gravity
  • Air resistance
air resistance2
Air Resistance
  • Imagine dropping two pieces of paper. One is crumpled and the other is flat.
  • Which one will reach the ground faster and why?
  • The crumpled one because it has less surface area.
air resistance3
Air Resistance
  • When something falls, air resistance acts in the opposite direction as the force of gravity.
  • Air resistance acts in the opposite direction of the object’s motion.
air resistance4
Air Resistance
  • The amount of air resistance an object experiences depends on three thingS:
  • Speed
  • Size
  • Shape
air resistance5
Air Resistance
  • Why do leaves, papers, and feathers fall at different speeds than acorns, pens, and glasses?
  • Because of Air Resistance…
  • Air resistance not mass is responsible for the difference in objects falling speed.
terminal velocity
Terminal Velocity
  • As an object falls, it accelerates and its speed increases.
  • The force of air resistance increases with speed.
terminal velocity1
Terminal Velocity
  • The force of air resistance increases until it becomes large enough to cancel the force of gravity.
  • When the forces cancel each other out the object no longer accelerates.
  • The object then falls at a constant speed called terminal velocity.
terminal velocity2
Terminal Velocity
  • Terminal Velocity is the highest velocity that a falling object will reach.
  • A low terminal velocity allows the skydiver to land safely.
terminal velocity3
Terminal Velocity
  • Why would a skydiver want to lay out flat versus falling standing up?
  • Think about our paper example… crumpled vs flat