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

OVERVIEW :

Theory

What should we do?

Experience

Experiments data

What have we found?

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 .

t =√2h / g

h = ½ g * t

g = 2h / t ²

= 9.81 m/s²

Galileo Galilei

Neil Armstrong

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