PHYSICS 1010 Tutorial #1 Solutions
In its investigations, Physics uses physical quantities (length, mass, time, force, power, work, etc). All
these physical quantities are classified in:
•
Fundamental quantities
length, mass, time.
•
Derived quantities
(quantities that can be expressed as a combination of fundamental quantities):
speed, acceleration, force, power, work, etc.
1.1 Standards of Length, Mass, and Time
Length, mass, and time are fundamental physical quantities. Their units are fundamental units in S.I.=
Systeme International (French) of units: meter, kilogram, second.
Practice 1.1.1:
Complete the following table:
Quantity name
Quantity symbol
Unit name
Unit symbol
distance
D,d
meter
m
area
A
meter squared
m
2
volume
V
meter cubed
m
3
time
T, t
second
s
mass
M, m
kilogram
kg
Practice 1.1.2: Conversions
(use the table below):
1.
7 nm =
7×10
-9
m
2.
20 MV = 2.0×10
7
V
3.
0.9 GW = 9×10
8
W
4.
1 h =
60 min = 3600 s
1.3 Dimensional analysis
– is a powerful method used when we want to determine if an expression has
the correct form
Rules
:
•
Physical quantities can be added or subtracted only if they have the same dimensions.
•
The terms on both sides of an equation must have the same dimensions.