1. Physics Chapter 2
Review & Practice

2. Online Resources Glencoe Physics Web Link:
Chapter 2 Links:

3. Review Questions
The meter, second and kilogram are what type of fundamental units? What system are they used in?
Length, time, mass in the SI system
What is a derived unit?
Combinations of fundamental units
How are very large and small numbers represented in science?
Using scientific notation

4. Review Questions What is 0.0001340 in scientific notation?
1.340 x 10-4
How many significant figures are in the above number?
Four
What is definition of precision?
The degree of exactness of a measurement or repeatability of a measurement

5. Review Questions
When a measured value is close to the accepted value it is said to be _________?
Accurate
The last digit in a measurement is an ???
Estimate
When multiplying numbers the result can only have as many significant figures as the?
The number with the least significant figures

6. Review Questions Which variable manipulated or changed?
The independent variable
Which variable is measured or responds to the manipulated variable?
The dependent variable
Which axis should be used for each variable?
X axis = independent, Y axis = dependent

7. B. Sig. figs. when multiplying or dividing:
answer has
the _________
number of
sig. figs., in this
case: ____
____ sig. figs. 3
lower
3.73 x 5.7 = 21 2
____ sig. figs. 2
C. Sig. figs. when adding or subtracting: 3
18.541
+106.6
125.1
___ decimal places 1
lower
answer has the _________
number of ___________________ ,
in this case: ____
decimal places 1

8. V. Converting Units: the power of "one"
Ex: Convert 60 miles to kilometers.
Use the conversion factor: 1 mi =__________ km
This can be written as either: or
Multiplying by either of these two factors does
not change the ________________ (only the units)
because both factors equal _______ .
1.609
1 mi
1.609 km
1.609 km
1 mi
actual value
one
1.609 km
1 mi
Write: mi x _________ = km
96.54
~100 km

9. Prefixes: see PhysRT, pg. ____ at ___________
In all calculations, any prefix symbol on an
SI unit must first be removed. 1
bottom
Ex: d = 15 nm rewrite as: d = 15 x _____ m
10-9
SI unit
prefix _________
represents ____
symbol
__________ for
length (meters)
10-9
with prefix
without
5.3 km
1.7 cm
2.00 ms
1.21 GW
8.6 kg
5.3 x 103 m
1.7 x 10-2 m
2.00 x 10-6 s
A trick b/c
kg is already
an SI unit
1.21 x 109 W
8.6 kg