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Free Fall

Free Fall. Aristotle, Galileo, and Newton. Aristotle (384 B.C.–322 B.C.). “All objects move towards their natural place”. Aristotle’s views on Free Fall. Speed of objects in free fall is proportional to mass. Objects fall down because the center of the Earth is their natural place.

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Free Fall

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  1. Free Fall Aristotle, Galileo, and Newton

  2. Aristotle(384 B.C.–322 B.C.) “All objects move towards their natural place”

  3. Aristotle’s views on Free Fall • Speed of objects in free fall is proportional to mass. • Objects fall down because the center of the Earth is their natural place.

  4. Aristotle’s views on Free Fall • Objects fall faster through mediums that are less dense. • Was not aware of the effects of friction.

  5. Galileo Galilei (1564-1642) “I do not feel obliged to believe that the same god who has endowed us with sense, reason and intellect has intended us to forgo their use.”

  6. Facts about Galileo Father of Kinematics (How) Tested his hypothesis through experimentation. Concluded that all objects fall at same rate of acceleration regardless of mass when air resistance is ignored.

  7. Galileo and Free Fall Goal: determine the value of ‘g’ Didn’t have a very accurate time measuring device. Used an incline plane to study free-fall.

  8. Galileo and Incline plane • Found object speed up as the got further and further down plane. • Found objects speed up at faster rate when the angle of the incline got steeper.

  9. 0s 1s 2s 3s 4s 0m/s -9.8m/s -19.6 m/s -29.4m/s -39.2m/s Velocity vs. time Velocity (vf) of object after equal and consecutive units of time (Δt). Conclusion… Gain speed at the same rate (-9.8m/s/s) in each successive equal time interval. v α t

  10. Displacement vs. time 1 3 5 7 Displacement (Δd) of object in equal and consecutive units of time (Δt). Conclusion… More distance is covered in each successive equal time interval.

  11. 1 Position (d) of object after equal and consecutive units of time (t). 4 9 d α t2 16

  12. Sir Isaac Newton (1642-1727) “Truth is ever to be found in the simplicity, and not in the multiplicity and confusion of things.”

  13. Fact about Newton Father of dynamics (why) Published ‘Three laws of motion’ and universal law of gravitation in 1687. Inertia F=ma Action/reaction

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