Exploring Mass and
Weight
Completed work:
Table of results, calculated averages and summary
Title: Lab: Exploring Mass and Weight
Date:
Use digital
balance
1
Weight/ Mass
2
3
4
5
6
7
8
9
Mass
(g  kg)
Weight
(N)
W÷m
Use Newton spring
Find the average for w/m: _______
Observations:
Summary:
What is a Newton?
What does this number you calculated for the average represent? How
close were you to actual number?
10
Weight and Mass
Weight is a measure of the
force of gravity on an object
Weight = Mass x acceleration
due to gravity
w= mg
Second Law of
Motion:
The law of
Acceleration
2nd Law of Motion
Force = mass x acceleration
F = m x a
W= m x g
Weight = mass x gravity
Acceleration due to
gravity
Constant:
9.8 m/sec/sec
How close were you?
Title: Lab: Exploring Mass and Weight
Date:
Use digital
balance
1
Weight/ Mass
2
3
4
5
6
7
8
9
10
Mass
(g  kg)
Weight
(N)
W÷m
Use Newton spring
Find the average for w/m: _______
Observations:
Summary:
1) What is a Newton?
2) What does this number you calculated (weight/mass) represent? How
close was your average to the actual number of 9.8?
2nd law of Acceleration
• How much force do you exert when you
take a step?
• How about on the moon? (acceleration
due to gravity = 1.6
nd
2
Law of Acceleration
What would happen if
these two objects fell?
Think about force, mass, and
acceleration
vs.
How fast they fall misconception
•
•
•
http://www.glencoe.com/sites/common_assets/science/virtual_labs/E25/E25.html
(different objects on Earth and Moon)
http://cccmkc.edu.hk/~kei-yhk/MyProject/falling.html (Galileo’s famous ball vs
feather experiment)
http://www.physicsclassroom.com/Class/1DKin/U1L5e.cfm (the big misconception)
2nd Law of Motion
Force = mass x acceleration
F = m x a
W= m x
g
So, if acceleration is held constant,
what is the relationship between
mass and force?
2nd Law of Motion
Force = mass x acceleration
F = m x a
constant
So, if we keep acceleration constant,
what is the relationship between
mass and force?
More mass  more force
Tie back to
st
1
law
Which object would
require more force to
get moving?
vs.
INERTIA
Tendency of objects
to stay at rest or
remain in motion
Resist change in motion
Tie back to
st
1
law
Which object would
require more force to
get moving?
vs.