13. 14
WeightWeight
The measure of the force
of gravity on the mass of
an object
Weight changes with
gravity
The metric unit for weight
is a Newton (N)
14. 15
Weight formulaWeight formula
1 kg = 2.2 pounds
Weight is mass times gravity
(9.8 m/s2
)
W= m x g
What is your mass?
What is your weight in
Newtons?
15. 16
What is gravity?What is gravity?
The force of attraction
between objects is
gravity
All objects exert a
gravitational force on
each other
19. 20
What affects gravity?What affects gravity?
The pull of gravity
weakens as the
distance between
objects increases
gravity depends on
mass and distance
27. 28
IceIce
Ice floats therefore it is
less dense than water
Ice mostly remains
underwater with only a
portion of it being
exposed
28. 29
Astronomy fact!Astronomy fact!
The planet Saturn has
a density of less than
1.0 g/ml. If there was
an ocean big enough to
hold it, it would float!
34. 35
What is a physical property?What is a physical property?
Physical properties
are those that can be
observed without
changing the identity
of the substance
35. 36
Phases of matterPhases of matter (video)(video)
Four phases of matter:
solid, liquid, gas, and
plasma
solids have a definite
shape and volume
36. 37
Solid particle arrangementSolid particle arrangement
Solids are tightly packed
and the particles vibrate
Two types of solids are
crystalline and
amorphous
37. 38
Types of solidsTypes of solids
Crystalline solids are
arranged in repeating
patterns called
crystals (salt, sugar)
Amorphous solids can
lose their shape
38. 39
Examples of amorphous solidsExamples of amorphous solids
Tar, candle wax, glass
Shape changes under
certain conditions
(differences in
temperature)
43. 44
Properties of liquidsProperties of liquids
Liquids do not expand
to fill the volume of a
container
Liquids are
characterized by their
ability to flow
44. 45
What is viscosity?What is viscosity?
The resistance of a liquid
to flow
The difficulty of a liquid
to flow easily
Honey, motor oil, corn
syrup have a high
viscosity
45. 46
Behavior of liquidsBehavior of liquids
Cohesion is the force of
attraction between LIKE
particles
Adhesion is the force of
attraction between
UNLIKE particles
58. 59
Boyle’s lawBoyle’s law
If the volume of a gas
decreases, then the
pressure of a gas
increases (Boyle’s law)
The smaller the space
a gas occupies, the
more pressure
61. 62
Phase changes (video)Phase changes (video)
Phase changes in
matter are melting,
freezing, vaporization,
condensation, and
sublimation
62. 63
What is a physical change?What is a physical change?
Physical changes involve
the changing of physical
properties
Type of matter remains
the same
68. 69
Phase changes (video)Phase changes (video)
Involve a change in
volume, but mass
remains constant
Adding or removing
energy from matter
results in phase changes