Falling Bodies
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A set of slides created to teach Falling Bodies and vertical motion to students following the South African National Science curriculum (NSC CAPS) in Cape Town.

A set of slides created to teach Falling Bodies and vertical motion to students following the South African National Science curriculum (NSC CAPS) in Cape Town.

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Falling Bodies Presentation Transcript

  • 1. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Falling Bodies (Vertical Motion) K Warne
  • 2. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Mass & Weight Mass (kg): • This is a measure of the amount of matter (number of kilograms) that makes up a body. Weight (N): • This is the force of gravity exerted on a body’s mass by the earth (planet). Fg 1 kg 1 kg 1 kg G10 Revision
  • 3. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net 98 N Falling Objects Two different object with different masses will FALL at the same RATE. • The force of gravity on 1kg of mass is 9.8 N. • Each unit of mass has the same force on it! • Each mass unit will have the SAME ACCELERATION. 1kg 9.8N 9.8kg 1kg 9.8N 1kg 9.8N 1kg 9.8N 1kg 9.8N 1kg 9.8N Weight = mass x 9.8 Force of gravity on the mass (N) Amount of matter in the object (kg) Gravitational acceleration (m.s-2)
  • 4. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Gravitational Field Strength • The weight of a 5kg bag of sugar on each planet. g = 9.8 N.kg-1 g = 3.8 N.kg-1 A gravitational field causes masses inside it to experience a force of attraction. Gravitational field strength = Gravitational Force per unit mass g = F/m (N.kg-1) g = 23.6 N.kg-1 5kg 5kg…..N ….. 5kg ……….
  • 5. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Finding “g” by Pendulum • The cotton is burnt to release the plumb bob. • The vertical distance is measured to where the plumb bob …………………………... • The distance is fallen in …………………….. …………………………………………….. • Readings: …………….., ………………… S = ……………………… • The time is measured for ……… complete oscillations to give a ……………….. reading. • If the time for 10 oscillations is 16,6s - the time for ¼ oscillation is …………………... • If the distance fallen is …………..m. • Acceleration or “g” can then be calculated. a = ……………………………………………. s
  • 6. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Motion of Falling object Time (s) Displacem ent (m) Average Velocity Instantaneou s Velocity (m.s-1) Accelerati on (m.s-2) 0 0 0 0 10 5 5 10 10 20 10 20 10 45 15 30 10 4 80 20 40 10 5 125 25 50 10 6 180 30 60 10 1 2 3
  • 7. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Fg =mg 1. Object about to start falling. V=0 W=mg 2. Object is falling. V>0 Friction a 9.8 m/s2 Friction=Fg a= m/s2 TERMINAL VELOCITY 3. The object now moves with TERMINAL VELOCITY. An object is dropped from REST. V = max
  • 8. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net • Falling objects …………………………….. at ………………….. • The velocity increases every second and the ……………………………… every second increases as well. • The ……………………………… increases with every second that the object is falling. • Each particle applies a small force on the object and the until the …………………… ……………………… to the downward force of gravity. • There is …………………………. force and therefore no acceleration. • The object will continue to move at …………. …………………. • This velocity we call ……………………. The terminal velocity of an object is dependant on its size and shape. Terminal velocity From World Book © 2002 World Book, Inc., 233 N. Michigan Avenue, Suite 2000, Chicago, IL 60601. All rights reserved. World Book illustration by David Cunningham
  • 9. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net G r a v i t y Equations of motion for free fall and vertical projectile motion An object is in “…….. ……………” if: • it is moving ….. or ……….. without ……………. other than …………… • we ignore ………. …………….. • we can substitute “g” for “a” in equations because the ………….. …………………. is gravity. gsuv gtuts gtuv 2 2 1 22 2   
  • 10. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net A ball falls freely from rest. a) velocity vs. time b) displacement vs. time c) acceleration vs. time d) speed vs. time e) distance vs. time v t x t a t t v x t a) b) c) d) e) + Consider only the period of free fall and take upward direction as positive (+ve).
  • 11. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net A ball is thrown vertically upward and returns to the throwers hand. a) velocity vs. time b) displacement vs. time c) acceleration vs. time d) speed vs. time e) distance vs. time Consider only the period of free fall and take upward direction as positive (+ve). v t x t x t t v s t a) b) c) d) e)
  • 12. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Hi - This is a SAMPLE presentation only. My FULL presentations, which contain a lot more more slides and other resources, are freely available on my resource sharing website: www.warnescience.net (click on link or logo) Have a look and enjoy! WarneScience