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# Vertical Motion

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PowerPoint to teach vertical motion to G12 students in South Africa studying the national science curriculum (CAPS) syllabus.

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### Vertical Motion

1. 1. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Vertical Motion K Warne 100 kg 1kg 10 N 10kg 1kg 10 N 1kg 10 N 1kg 10 N 1kg 10 N 1kg 10 N G r a v i t y
2. 2. 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
3. 3. 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 5 5 20 10 45 15 4 80 20 5 125 25 6 180 30 1 2 3
4. 4. 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 5 5 10 20 10 20 45 15 30 4 80 20 40 5 125 25 50 6 180 30 60 1 2 3
5. 5. 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
6. 6. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Fg =mg 1. Object about to start falling. V=0 2. Object is falling. V>0 Friction a=10m/s2 The object accelerates towards the earth. a<10 m/s2 Acceleration decreased! Friction= a= 0 m/s2 TERMINAL VELOCITY 3. The object now moves with TERMINAL VELOCITY. An object is dropped from REST. V = maxFres < Fg
7. 7. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Gravitational Acceleration 9.8 m.s-2 Equations of motion for free fall and vertical projectile motion An object is in “free fall” if: • it is moving up or down without influence other than gravity • we ignore air friction • we can substitute “g” for “a” in equations because the only acceleration is gravity. • x = (vi + vf) 2  t • vf = vi + at • x = vi t + 1/2a t2 • vf 2 = vi 2 + 2a x
8. 8. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Gravitation and Falling Bodies Fg = mg V = (-) a = -10m/s2 • The only force on the object is its weight. • The object continually accelerates downwards. • Take the upwards as positive, acceleration downwards negative. • Velocity momentarily zero at apex. • Time up = time down • velocity at return = velocity of projection Fg = mg V = (+) a = -10m/s2 V=(0), a = -10m/s2 An object is thrown vertically up into the air and allowed to fall back down. +
9. 9. 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 s t a t t v s t a) b) c) d) e)
10. 10. 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 slides and other resources, are freely available on my resource sharing website: www.warnescience.net (paste into your browser if link above does not work) Have a look and enjoy! Keith Warne WarneScience
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