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Daily Agenda

Daily Agenda. Ms. DeSalvo November 22, 2013. CPS Bell Ringer: 11/22/13 Activity: Terminal Speed. When a coin and a feather are dropped in a vacuum, they reach the ground at the same time because only gravity acts on the object.

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Daily Agenda

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  1. Daily Agenda Ms. DeSalvo November 22, 2013

  2. CPS Bell Ringer: 11/22/13Activity: Terminal Speed When a coin and a feather are dropped in a vacuum, they reach the ground at the same time because only gravity acts on the object. • If we drop the coin and the feather outside with air resistance, which object will reach the ground first? • Explain your answer.

  3. CPS (Period 6,8)November 22, 2013 Last Class (See me for missed work) • Cart & Pulley Labs • Part 2 Today • Terminal Speed

  4. Terminal Speed Important notes are highlighted in green today!

  5. Remember Free Fall… • Only a single force acts on an object in free fall…the force of gravity. • Due to this, falling objects will reach a surface at the same time, regardless of the mass. • The force and mass are directly proportional.

  6. Terminal Speed States.. • The speed at which the acceleration of a falling object terminates when air resistance balances its weight.

  7. FF vs TS • In free fall the downward force is weight and only weight. • When air resistance is present, the downward net force is weight-air resistance. • Can you see how air resistance reduces the net force? This means acceleration is reduces also.

  8. Factors of TS • When the force of gravity and air resistance act on an object, it is no longer free-fall. • Air resistance sends an object into terminal speed. • Air resistance depends on two things: speed and surface area. • As air resistance combats speed and surface area, acceleration of the object becomes less.

  9. The short notation… • Acceleration = net force - resistance mass • A = Fn – R m • Unit notation… m/s2 = N Kg

  10. Visual Example Mr. Garcia Air Resistance Ms. DeSalvo Air Resistance The heavier parachutist must fall faster than the lighter parachutist for air resistance to cancel his greater rate. Weight

  11. Terminal Velocity • What happens when air resistance builds up to equal weight? • Net force becomes zero! • This means Acceleration becomes zero! • The skydiver is still falling, but he is no longer gaining any speed. • Acceleration terminates when weight and air resistance are balanced. • When net force and acceleration in a given direction become zero we call this terminal velocity.

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