1. Physics and its language
Prof.ssa Babbo Paola
Liceo Scientifico Vitruvio- Avezzano
a.s

2. “Physics and its language” and you’ll meet a lot of quantities.
You’ll read the text
“Physics and its language”
and you’ll meet a lot of quantities.
But what is a quantity?

3. ( a property) that can be measured using an instrument.
Quantity is something
( a property) that can be measured using an instrument.
Time / chronometer

4. We can classify quantities in:
QUANTITY
BASE Q.
DERIVED Q.

5. (magnitude and direction)
QUANTITY
SCALAR Q.
(magnitude)
VECTOR Q.
(magnitude and direction)
or in

6. Quantity has a unit (unit of measurement)
Time - second t = 5 s
Length -meter l = 4m
Force -Newton F = 2N
and usually we use the unit in the S.I.
(International System of Units)

7. Base Quantity Unit time kilogram lenght kelvin current mol intensity 12
kilogram 3
lenght 4
kelvin 5
current 6
mol 7
intensity

8. Base Quantity Unit time second mass kilogram lenght meter temperature1
time
second 2
mass
kilogram 3
lenght
meter 4
temperature
kelvin 5
current
Ampere 6
amount of substance
mol 7
intensity
candela

9. Time: The dimension of the physical universe which, at
a given place, orders the sequence of events.
Mass: A quantitative measure of a body’s resistance to being accelerated.
Lenght: Extension in space.
Temperature: A property of an object which determines the direction of heat flow when the object is placed in thermal contact with another object
(heat flows from a region of higher temperature to
one of lower temperature).

10. Current: The net transfer of electric charge per
unit time.
Amount of substance: A measure of the
number of particles (atom, molecules,…) present in a
substance.
Intensity: The power transmitted by a light wave
across a unit area perpendicular to the wave

11. Scalar quantity
Vector quantity

12. Scalar quantity Vector quantity time force mass velocity lenght
acceleration

13. GROUPWORK (15 MIN part a/b/c/d 10 MIN part e)

14. Read the text;
Make a list of all the quantities in the text;
Divide the quantities you wrote in base or derived quantities;
Make a list of all the words in the text concerning to the situation of a body that is not at rest;

15. Check the answers
“How many quantities?”
“ Is it a base or a derived quantity?”
“ What about a body that isn’t at
rest?”
Do you know all the quantities
or not?

16. e) Fill in the chart using the
definitions.
I Look at the yellow letters, if it will
be right you’ll read…

17. 1.The unit of mass in the S.I.
2.The unit of temperature in the S.I.
3.That influence on a body which causes it to accelerate
4.The gravitational attraction at the surface of a planet or other celestial body
5. It is a force…not to be confused with the mass
6.The unit of current in the S.I.
7.The study of the behaviour of physical system under the action of forces
8.The quantity of the most famous Einstein’s formula
9.The quantity defined as mass over volume
10.The quantity measured by a chronometer
11.The rate of decrease of speed of a motion
12.The magnitude of velocity vector

18. 1 K I L O G R A M 2 E V N 3 F C 4 T Y 5 W H 6 P 7 S 8 9 D 10 11 12

19. BIBLIOGRAPHY:
Martelli, Creek “ Focus on science”
Minerva editore
Il Mc Graw-Hill , Dizionario enciclopedico scientifico e tecnico,
Zanichelli