1. Introduction to Physical Science Mass and Weight
Lesson 1

2. What is Physical Science
Do Now Journal Entry: In your own words, define physical science.
Definition: sciences concerned with inanimate natural objects including physics, chemistry, astronomy, and related objects
Physical Science
Matter
Energy
Chemistry
Physics
Basic Chemistry
Sub-atomic particles
Chemical reactions
Explain why objects move the way they do

3. Matter What exactly is matter?
Anything that takes up space and has mass
Mass: amount of matter an object is made out of

4. Matter Journal Entry: Is air matter? YES! Air is Matter
You can fill an empty balloon with air and it occupies the space
Filling up a bike tire
Pressure = m/v  air must have a mass if it exerts pressure
Matter in air is what supports the weight of a plane or the weight of clouds
Average cloud weighs one million pounds

5. From Matter to Mass How is Mass related to Matter?
The mass of an object is a measure of the object’s inertial properties  the amount of matter it contains
The basic unit of mass is kg
Smaller items will be measured in g
Mass = Volume x Density
M (kg/g)=V (Solids cm^3/Liquors L )x D (kg/cm^3)
Mass=Force/Acceleration
M(kg/g)=F(N)/a (m/s^2)
How do we measure Mass?
Triple beam or electronic balance
There are different ways to calculate mass

6. Mass vs Weight What’s the difference between mass and weight?
The mass of an object is the amount of matter that the object contains
Weight is the amount of gravitational force that is applied to an object
Think about traveling to the moon…Would you weight the same amount?
CLASS ACTIVITY
Calculate weights on different planets

7. Calculating Weight on the Moon
9.8 N/kg
1.6 N/kg
3.7 N/kg
25 N/kg
Things you need to know
Weight (N) = Mass (kg) x Acceleration of gravity (N/kg)
W=MxA

8. Calculating Weight on the moon
Bruce weighs 185 lbs on Earth how much will he weigh on the moon?
Convert weight into the same unit (lbs  kg)
Weight and Mass have the same NUMERICAL value on Earth BUT are measured in different units, therefore they are not the same. The Acceleration of gravity (9.8 N) equals 1 kg.
Calculate weight (N) value on Earth by pulling in numbers into the equation
Calculate weight (N) value on the moon by pulling in equation
Divide the weight (N) on the moon/planet by Earth
Earth
W = MxA
W=84 kg x 9.8 N/kg
823.2 N
Moon
W=MxA
W = 84 x1.6 N/kg
134.4N
134.4/823.2=0.16
You weigh 1/6 of your weight on the moon.

9. Class Activity Calculate the weight on Mars
Calculate the weight on Jupiter
Sam weighs 100 lbs on Earth. How much will they weigh on Mars?
An African forest elephant weighs 6,000 lbs how much does it weigh on Mars?
A German Shephard weighs 70lbs. How much does it weigh on Mars?
What is the % of weight from Mars to Earth?
My cat weighs 14 lbs on Earth. How much will he weigh on Jupiter?
Alex weighs 30 kg. What is their weight on Jupiter?
New York rat weight 2 kg. What is it’s weight on Jupiter
What is the % of weight from Jupiter to Earth?
45 kg x 9.8 N/kg = 441 N x 9.8 = 62.36
45 kg x 3.7 N/kg = N x 25 = 159
166.5/441 = /62.36 = 2.55
x 9.8 = N x9.8=294
x 3.7 = N x35=750
/ = /294 =2.55
31.89x9.8= x9.8 =19.6
31.89x3.7= x25=50
117.99/312.52= /19.6 = 2.55
W (N) = M(kg) x A (N/kg) kg = lbs/2.2

10. Converting Weight from N to lbs
Weight = Mass x Surface Gravity
So, if you know your weight on Earth and the surface gravity on Earth, you can calculate your mass. You can then calculate your weight on any other planet by using the surface gravity of that planet in the same equation.
Find the weight of the following on each planet
Sam 100 lbs
Elephant 6,000 lbs
My cat 14 lbs
NY Rat 4.4 lbs
Surface gravity ratio’s compared to Earth
Mercury  .38
Venus  .91
Earth  1.0
Mars  .38
Jupiter  2.34
Saturn  .93
Uranus  .92
Neptune  1.12

11. Mass and Weight Venn Diagram
Definition
Effect of Gravity
How is it measured
Units
Weight
Mass: amount of matter in an object
No change in gravity
Triple beam balance scale
Kilograms
Weight: amount of force (gravity) acting on an object
Effect: More gravity more weight
Spring scale
Newtons
Same: only related by the gravitational constant between them

12. Summary Mass=Volume x Density Mass=Force / Acceleration
M=VxD
Mass=Force / Acceleration
M=F/A
Triple Beam Balance
Definitions:
Mass
Matter
Weight

13. Homework In the back of your notebook/binder create a vocab section.
Define: Matter, Mass, and Weight