- #1

Physics Time

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The mass(G) we got were:

23.4 mass(g) - 7.7 Air speed(km/h)

22 mass(g) - 9.7 Air speed(km/h)

20.3 mass(g) - 12.1 Air speed(km/h)

19.2 mass(g) - 13.5 Air speed(km/h)

18.35 mass(g) - 13.7 Air speed(km/h)

I needed to find the lifting force and the Speed in m s-1

So original mass 25.5 x 9.8 = 249.9

Then the mass' we got:

23.4 x 9.8 = 229.32

22 x 9.8 = 215.6

20.3 x 9.8 = 198.9

19.2 x 9.8 = 188.16

18.35 x 9.8 = 179.83

So take away all the mass' with the original mass (example 249.9 - 229.32 = 20.58)

We get for lifting force (N):

20.58

34.4

51

61.74

70.07

*** The teacher told me that this doesn't look like in Newtons.. He told me that I should change the mass(g) to kg.. ? So if I do that will that be the lifting force (N) ?**

So 23.4 G is now 0.0234Kg

22 grams = 0.022 kilograms

20.3 grams = 0.0203 kilograms

19.2 grams = 0.0192 kilograms

18.35 grams = 0.01835 kilograms

So do i now 0.022 x 9.8? 0.2156... Then 249.9 - 0.2156 = 249.6844 to find the lifting force??

By the way the air speed in m/s is now:

2.14

2.69

3.36

3.75

3.80

After all this I have to draw two separate graphs one with the lifting force and air speed, one with the lifting force and v^squared (so air speed squared)... on a graph paper and then explain what we see...