la magia della fisica - itfalco.edu.it
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Istituto Tecnico Settore TecnologicoG. C. Falco
CAPUA
10.2.2A-FSEPON-CA-2017-688 “Obiettivo...recupero competenze di base”CUP: J85B17000150007
LA MAGIA DELLA FISICA
Esperto: prof.ssa Anna CHIAPPINI Tutor: prof. Antonio PICCIOLA
The free fall of a body is based on the height
from which it is launched and the time taken to
touch the ground. The ratio between the
velocity ( meters/seconds )
and the time ( seconds ) is called acceleration
of free fall ( g = 9,81 m/s² ) and it is the same
for all the objects falling near the Earth’s
surface
Using the Phyphox application we will
calculate the fall time used by different
bodies at different heights. We will do this
using the acoustic stopwatch which will
understand the instant t1 in which the body
begins to fall and the instant t2 in which
the body touches the ground through 2
acoustic signals. Our aim is to prove that the
gravity acceleration g is always constant
regardless of the height, time and mass of the
body taken into question
This type of experiment can be done in
different ways but we will use the “ balloon
method”. First of all we have to get some
objects: balloons , a needle, a
rod and a body which suffers gravity
WHAT TO DO:1) Inflate the balloon
2) Hook the object to the balloon
3) Place the balloon at a height h of the rod
4) Burst the balloon with the needle
5) Collect data
6) Repeat the action at different heights and with different objects
HEIGHT TIME
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
0 50 100 150 200 250 300 350
Tim
e (
s)
Height (cm)
t=√2h/g
0 0
25 0,223
50 0,316
75 0,389
100 0,447
125 0,503
150 0,547
175 0,596
200 0,632
225 0,676
250 0,713
275 0,748
300 0,781
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0 50 100 150 200 250
Tim
e (
s)
Height (cm)
MASS= 50g
0cm 0s25cm 0,22s50cm 0,312s75cm 0,387s
100cm 0,45s125cm 0,501s150cm 0,541s175cm 0,594s200cm 0,635s
HEIGHT TIME
0cm 0s25cm 0,219s50cm 0,31s75cm 0,382s
100cm 0,442s125cm 0,501s150cm 0,546s175cm 0,589s200cm 0,629s
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0 50 100 150 200 250
Tim
e (
s)
Height (cm)
MASS= 100g
HEIGHT TIME
0 0
25 0,2
50 0,293
75 0,351
100 0,417
125 0,469
150 0,525
175 0,573
200 0,625
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0 50 100 150 200 250
Tim
e (
s)
Height (cm)
MASS= 140g
HEIGHT TIME
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
0 50 100 150 200 250 300 350
Tim
e (
s)
Height (cm)
t=√2h/g
100 GRAMMI
0 0
25 0,219
50 0,31
75 0,382
100 0,442
125 0,501
150 0,546
175 0,589
200 0,629
140 GRAMMI
0 0
25 0,2
50 0,293
75 0,351
100 0,417
125 0,469
150 0,525
175 0,573
200 0,625
t=√ 2h/g
0 0
25 0,223
50 0,316
75 0,389
100 0,447
125 0,503
150 0,547
175 0,596
200 0,632
225 0,676
250 0,713
275 0,748
300 0,781
50 GRAMMI
0 0
25 0,22
50 0,312
75 0,387
100 0,45
125 0,501
150 0,547
175 0,594
200 0,635
The Pisan scientist (1564-1642) never really did the experiment of
throw the two weights (the grave) from the Tower of Pisa, as the legend
tells. But he worked out a simple, amazing mental experiment that has
revealed something very significant about the gravity.
As Galileo understands, the acceleration of gravity does not depend on
the mass of an object and this has been a fundamental result for the
physics and the ideas of motion and universal gravitation of ISAAC
Newton. According to Galileo Galilei, if we drop two bodies of different
masses, for example a hammer and a feather, it will fall more slowly
because of the friction of the air. If we went to a place without air, as on
the moon, the two bodies will fall at the same moment. This theory was tried by
astronaut Neil Armstrong, the first man who went to the moon. He knocked
down a hammer and a feather at the same height and noticed that the two
bodies were falling at the same time, thus confirming Galilei's theory .
WORK CARRIED OUT BY
“La magia della Fisica”Manuel Balasco, Alessandro Baldascino, Antonio Baldascino, Roberto
Caterino, Christian Cimino, Fiorella Ciriaco, Antonio Criscione,
Graziano D’Abrosca, Samuel De Nardis, Giovanni Di Florio, Paolo Pio Di Meo,
Biagio Palomba,Giulio Parnoffo, Alfonso Piccirillo, Asia Pietroluongo,
Simona Rinaldi, Francesco Russo, Paolo Russo, Orazio Flavio Sorbo,
Mariagerarda Trancucci