Transcript What time is it?

Physical Science
and You
• Chapter One: Studying Physics and Chemistry
• Chapter Two: Experiments and Variables
• Chapter Three: Key Concepts in Physical
Science
Chapter One: Studying Physics
and Chemistry
• 1.1 The Physical Science in Your Life
• 1.2 Time and Length
• 1.3 Inquiry and the Scientific Method
Investigation 1B
Measuring Time and Distance
• How are time and
distance measured
and described in
physical science?
1.2 Time and Length
• Time has two
important meanings.
– What time is it?
– How much time?
1.2 Units of Time
• Units for time include:
– seconds
– minutes
– hours
• The second is the basic unit of time in
both the English and metric systems.
1.2 Mixed Units
• Time is often expressed
in mixed units.
• This timer shows the
time for a race as 2
hours, 30 minutes and
45 seconds.
1.2 Mixed Units
• A microwave oven
can program time in
either mixed units
(minutes and
seconds) or in a
single unit (seconds).
How will 1:30 and 0:90 will result
in the same cooking time?
1.2 Length and Distance
• Distance is the amount of space between
two points.
• Distance is measured in units of length.
1.2 Length and Distance
• Some of the commonly used units of
length include inches, feet, miles,
centimeters, kilometers, and meters.
1.2 Length and Distance
• The names of units in
the metric system are
based on multiplying
by ten.
• Almost all fields of
science use metric
units because they are
easier to work with.
1.2 Measuring Length
• For ordinary lengths you
must measure in the
laboratory a meter stick is
the most convenient tool to
use.
• For very small lengths, such
as the size of a bacteria,
scientists use measuring
instruments that fit into a
microscope.
1.2 Measuring Length
• The micron (μ) is
a very tiny unit of
length, appropriate
to measuring tiny
living creatures
like bacteria.
1.2 Converting between units
• In order to convert
between units, we
use conversion
factors.
• A conversion
factor is a ratio
that has the value
of one.
Activity
Make a Water Clock
• A clock is a tool used to
measure time.
• Inside a clock are parts
that move with a
constant repetition.