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PPT On Free Fall

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Published in: Physics
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PPT on Free Fall

Damodar T / Dubai

22 years of teaching experience

Qualification: M.Sc B.ed

Teaches: Physics

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  1. N/A
  2. Objectives : KPI 8.1 Use the equation of motion for free fall by replacing a with ; — -9.8?/A: and solve problems for an object in free fall moving both upwards and downward Free Fall
  3. Objectives : KPI 8.1 Use the equation of motion for free fall by replacing a with ; — -9.8?/A: and solve problems for an object in free fall moving both upwards and downward Class starter Wait-time "Wouldn't an elephant fall faster than a mouse. PEDESTRIANS push button and wait for signal opposite not
  4. Objectives : KPI 8.1 Use the equation of motion for free fall by replacing a with ; — -9.8?/A: and solve problems for an object in free fall moving both upwards and downward Galileo's Great Discovery: How Things Free Fall Write Two-Sentence Summary Galileo
  5. Objectives : KPI 8.1 Use the equation of motion for free fall by replacing a with ; — -9.8?/A: and solve problems for an object in free fall moving both upwards and downward Free Fall Free Fall: The motion were all objects fall with the same constant acceleration Falling objects : fall downwards or thrown up Free-falling objects do not encounter air resistance. All the falling objects re
  6. Objectives : KPI 8.1 Use the equation of motion for free fall by replacing a with ; — -9.8?/A: and solve problems for an object in free fall moving both upwards and downward Free Fall Acceleration: Free-fall acceleration is independent of mass. : I = g = 9.8 m/s2 Magnitude a Direction: always downward, so ag is — —9.8 m/s2 negative a = —g — The free fall acceleration (on the surface of the earth is m a=-g =-9.81— 2 s TABLE 2—5 Values of g at Different Locations on Earth ( m/ 52 ) Location North Pole Oslo, Norway Hong Kong Quito, Ecuador Latitude 900 N 600 N 300 N 00 g 9.832 9.819 9.793 9.780
  7. Objectives : KPI 8.1 Use the equation of motion for free fall by replacing a with ; — -9.8?/A: and solve problems for an object in free fall moving both upwards and downward Test your Understanding https://flipquiz.me/review/119591
  8. Test your Memory Objectives : By the end of the lesson the students will be able to : Q. is the motion of a body 1. 2. when air resistance is negligible and the action can be considered due to gravity alone. A. Free fall B. Free flight C. Negative fall D. Zero-gravity fall Define the free fall & free fall acceleration Using the equation of motion for free fall by replacing a with g .
  9. :ulating Free Fall problems Objectives : By the end of the lesson the students will be able to : 1. 2. I. An object dropped (released from rest) Types of free fall 2.An object thrown vertically down ward 3. An object thrown vertically up ward Define the free fall & free fall acceleration Using the equation of motion for free fall by replacing a with g . 2.1 : Use the equation of motion for free fall by replacing a . —9.82/4. and for an Objectin free fall moving h 0th upwards and downward
  10. Calculating Free Fall problems . You can use any of the kinematic equations to a— g — —9.8 m/s2 solve free fall problems l)v; = v: + 2aAX 2)AX = viAt+-aAt2 3)Vf = V/ + aAt 4)AX - At 2 Note Vf2= Vi2+ 2g Ay Ay = Vit + h gt2 vf= vi+ gt Ay = h ("f + Vi)t
  11. object dropped (released from rest) 1. Substitute 3. Use g=-10m/s2 2.1: Use the equation of motion for free fall by replacing a with . = -9.82/4, and solve problems for an object in free fall moving both upwards and downward
  12. ice Problem: objects falling down A coin is dropped from the top of a tower that is 125m high. Taking g = 10 m s-2 and ignoring air resistance, calculate: a) The time the coin is in the air. b) The velocity of the coin just before it hits the ground. Helpful Tips Vf2= Vi2+ 2g Ay Ay = Vit + h gt2 vf= vi+ gt Ay = h ("f + Vi)t a = —g = —9.8 m/s2
  13. AFL: Solve Week 2 Work 2 Sheet part 1 2.1: Use the equation of motion for free fall by replacing a with . = -9.82/4, and solve problems for an object in free fall moving both upwards and downward
  14. 2. An object thrown down ward with initial nonzero speed 1. Substitute you put a number for it. g=-10m/s2 3. Use 2.1: Use the equation of motion for free fall by replacing a with . = -9.82/4, and solve problems for an object in free fall moving both upwards and downward
  15. AFL: Solve Week 2 Work 2 Sheet part 2 2.1: Use the equation of motion for free fall by replacing a with . = -9.82/4, and solve problems for an object in free fall moving both upwards and downward
  16. in object thrown vertically upward. At rnuim_rn the stops a I Ornis2 time to go up OSS as it up velocity speed 5m/s (up) a (down) g -1 Ornis2 time to down OSS As it down SJE.ed 5rrVs vaocity = -&n/s (thwn) total time =O.5s *0.5s = Is Total dispk.cernmt 20 total distance &stance up •distance 5/4 •5/4210/4 Created by Paint X 2.1: Use the equation of motion for free fall by replacing a with . = -9.82/4, and solve problems for an object in free fall moving both upwards and downward
  17. 3. An object thrown vertically upward: it leaves and comes back with the same speed 1. It leaves with a velocity that is equal in size opposite in 2. magnitude to the returning velocity At the maximum height it stops ,so the velocity at the 3. maximum height 4. The distance traveled up = the distance traveled down 5. The total distance = distance up + distance down Displacement up is equal in size opposite in size to the 6. displacement down 7. Total displacement = O 8. Time to go up = time to go down 9. Total time (hang time) = time up + time down 10. The acceleration up = the acceleration down = -10m/s2 2.1: Use the equation of motion for free fall by replacing a with . = -9.82/4, and solve problems for an object in free fall moving both upwards and downward
  18. AFL: Solve Week 2 Work 2 Sheet part 3 2.1: Use the equation of motion for free fall by replacing a with . = -9.82/4, and solve problems for an object in free fall moving both upwards and downward
  19. actice Problem Q3. Your sister drops your house keys down to you from the second-floor window, as shown in Figure 25. What is the velocity of the keys when you catch them? Now, it's your turn to try! Figure 25
  20. actice Problem Q4. A bucket of paint falls from a ladder onto the sidewalk below. If the bucket falls for 0.95 s, what is its velocity just before it hits the sidewalk? Now, it's your turn to try! Helpful Tips Vf2= Vi2+ 2g Ay Ay = Vit + h gt2 vf= vi+ gt Ay = h ("f + Vi)t a = —g = —9.8 m/s2
  21. actice Problem Q5. How far will a brick starting from rest fall freely in 3.0 seconds? Now, it's your turn to try! Helpful Tips Vf2= Vi2+ 2g Ay Ay = Vit + h gt2 vf= vi+ gt Ay = h ("f + Vi)t a = —g = —9.8 m/s2
  22. actice Problem Q. Free-Fall Ride Suppose a free-fall ride at an amusement park starts at rest and is in free fall. What is the velocity of the ride after 2.3 s? • How far do people on the ride fall during • the 2.3-s time period? Now, it's your turn to try! Helpful Tips Vf2= Vi2+ 2g Ay Ay = Vit + h gt2 vf= vi+ gt Ay = h ("f + Vi)t = —g = —9.8 m/S2 -10 m/s2

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