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Gen Physics

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Do all objects fall at the same ... Strap a Speedometer to a Rock. Attach a speedometer to a rock and drop it in free fall ... Strap a Speedometer to a Rock ... – PowerPoint PPT presentation

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Title: Gen Physics


1
Gen Physics
  • Chapter 2
  • Sections 5 6

2
Falling Objects
  • Do all objects fall at the same rate when
    dropped?
  • If there is NO air resistance, all objects fall
    at the SAME rate.

3
Free Fall
  • An object moving only under the influence of
    gravity
  • No air resistance

4
Strap a Speedometer to a Rock
  • Attach a speedometer to a rock and drop it in
    free fall
  • By how much does the speed increase per second?
  • 10 m/s
  • What is its acceleration?
  • 10 m/s2

5
Acceleration Due to Gravity
  • The acceleration due to gravity is 9.8 m/s2
  • Every second the speed increases by 9.8 m/s
  • Well use 10 m/s2 because its easier!
  • Symbol for the acceleration due to gravity is g

6
Strap a Speedometer to a Rock
  • Our data shows that speed acceleration due to
    gravity times time
  • v g t

7
Question
  • What is the speed of a rock 5 seconds after it is
    dropped?
  • 50 m/s

8
Question
  • What is the speed of a rock 10 seconds after it
    is dropped?
  • 100 m/s

9
Question
  • What is the speed of a rock 25 seconds after it
    is dropped?
  • 250 m/s

10
Throw a Ball Up
  • What happens if you throw a ball up?
  • gravity works against you so you slow down

11
Throw a Ball Up
  • How much does the balls speed decrease every
    second as it goes up?
  • 10 m/s every second

12
Free Fall
  • Any object in free fall experiences an
    acceleration of 10 m/s2
  • It gains 10 m/s every second as it goes down
  • It loses 10 m/s every second as it goes up

13
Drop a Rock
  • Drop a rock from rest in free fall
  • Data shows that the distance fallen time
    squared times the 1st distance travelled
  • d ½ g t2

14
Question
  • How far will a freely falling object that is
    released from rest fall in 7 seconds?
  • 245 m

15
Question
  • How far will a freely falling object that is
    released from rest fall in 20 seconds?
  • 2000 m

16
Question
  • How far will a freely falling object that is
    released from rest fall in 10 seconds?
  • 500 m
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