1. Mass
amount of matter
_________ m is the ______________________ that
an object contains. It is a ______________ .
scalar
A. units of mass: SI: _________________
 are _____________________ units
 have the ____________________________
kilograms, kg
fundamental
prefix kilo, k = 103
Other mass units:
1/ _____________
This is the approximate mass of a small _________________ or of a ___________________
Conversions: 1 kg = ________ g = _________ g
1 g = _________ kg
grams, g
paper clip
dollar bill
103
1000
10-3

2. In: m = 10 g  g stands for _________________
Note:
In: m = 10 g  g stands for _________________
In g = 9.8 m/s2  g = ___________________
___________________
grams
acceleration
due to gravity
2/ The _______________ mass unit u is defined as:
(1/12) the mass of a ____________________
Conversion: 1 u = _______________ (see PhysRT)
1 proton or neutron mass = __________
universal
12C atom
1.66 x10-27 kg
≈ 1u
3/ British: __________ (don’t need to know) ≈15 kg
slugs

3. II. __________w is the ____________________ (Fg)
(usually due to a planet) acting on an object.
It is a _____________ b/c is has _____________
____________________________________________
Weight
force of gravity
vector
direction
downwards towards the planet's center.
A. Units of weight are the same as for __________:
SI: _________________  derived
British: _________________
forces
newtons, N
pounds, lb
B. The weight of an object depends on:
1/ the ____________ of the object itself;
2/ the ___________ from the center of the planet;
3/ the ___________ of the planet.
mass
distance
mass

4. For the same object at 3 different _____________ :w or Fg
more mass 
________________
more weight
mass of object
locations
For the same object at 3 different _____________ :
_______ m
same
less w
same
_______ m
more w
mass m w
planet
denser
planet
Mass m is___________________________.
It is a ____________________ of an object.
the same everywhere
property

5. w is different in different locations because
_________________________________________
the strength of gravity can vary
Remember: _____________ = __________________
C. Its magnitude can be found from:
where m is the mass of the object _________
and g is the _____________________________ .
On Earth’s surface, g = _________________
Farther from the surface or on other planets,
_____________________________________________ .
weight w
force of gravity Fg
PhysRT:
Fg = mg
or:
w = mg
in kg
acceleration due to gravity
9.81 m/s2
g can have different values or be zero

6. Ex: Find the weight of a 45-kg goblin.
w = mg =
w = =
What is the force of gravity acting on the goblin?
Ex: The weight of a stick of butter is about 1.0 N.
What is its mass?
Ex: What is the weight of a 600-N student?