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FREE FALL NOTES.2X - HEATHCOTESCIENCE9

By Rachel Harper,2014-07-08 11:07
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FREE FALL NOTES.2X - HEATHCOTESCIENCE9

    Free Fall and Air Resistance

Free Fall:………………………………

    All objects free fall with acceleration: a = …………….

     Symbol:……………………

    ; Why do all objects free fall at the same rate of acceleration regardless of their mass?

    ; Why do objects that encounter air resistance ultimately reach a terminal velocity?

    ; In situations in which there is air resistance, why do more massive objects fall faster than less

    massive objects?

Elephant and Feather - Free Fall

    Suppose that an elephant and a feather are dropped off a very tall building from the same height at the same time. Suppose also that air resistance could somehow be eliminated such that neither the elephant nor the feather would experience any air drag during the course of their fall.

    TRUE or FALSE:

    1. The elephant and the feather each have the same force of gravity.

    2. The elephant has more mass, yet both elephant and feather experience the same force of gravity.

    3. The elephant experiences a greater force of gravity, yet both the elephant and the feather have the same

    mass.

    4. On earth, all objects (whether an elephant or a feather) have the same force of gravity.

    5. The elephant weighs more than the feather, yet they each have the same mass.

    6. The elephant clearly has more mass than the feather, yet they each weigh the same.

    7. The elephant clearly has more mass than the feather, yet the amount of gravity (force) is the same for

    each.

    8. The elephant has the greatest acceleration, yet the amount of gravity is the same for each.

Falling with Air Resistance

     Air Resistance:…………………………………

     Depends on:

     1.

     2.

     Increased Speed results in:………………………………

     Increased cross-sectional area results in:………………………….

    Elephant and Feather - Air Resistance

    Suppose that an elephant and a feather are dropped off a very tall building from the same height at the same time. We will assume the realistic situation that both feather and elephant encounter air resistance. TRUE or FALSE:

    1. The elephant encounters a smaller force of air resistance than the feather and therefore falls faster.

    2. The elephant has a greater acceleration of gravity than the feather and therefore falls faster.

    3. Both elephant and feather have the same force of gravity, yet the acceleration of gravity is greatest for the

    elephant.

    4. Both elephant and feather have the same force of gravity, yet the feather experiences a greater air resistance.

    5. Each object experiences the same amount of air resistance, yet the elephant experiences the greatest force of

    gravity.

    6. Each object experiences the same amount of air resistance, yet the feather experiences the greatest force of

    gravity.

    7. The feather weighs more than the elephant, and therefore will not accelerate as rapidly as the elephant.

    8. Both elephant and feather weigh the same amount, yet the greater mass of the feather leads to a smaller

    acceleration.

    9. The elephant experiences less air resistance and than the feather and thus reaches a larger terminal velocity.

    10. The feather experiences more air resistance than the elephant and thus reaches a smaller terminal velocity.

    11. The elephant and the feather encounter the same amount of air resistance, yet the elephant has a greater

    terminal velocity.

Terminal Velocity

    In the diagrams below, free-body diagrams showing the forces acting upon an 85-kg skydiver (equipment included) are shown. For each case, use the diagrams to determine the net force and acceleration of the skydiver at each instant in time. Then use the button to view the answers.

As an object falls what happens to its speed?

How does increased speed effect air resistance?

     Eventually the force of air resistance balances what?

     Net Force?

     Acceleration equals?

     This is called?

    Skydiving

     The amount of air resistance encountered by the sky diver depends on?

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