1. Mass vs. Weight Mass Weight Gravity Calculating Weight
Metric and The Standard/Imperial system of measurement
Mass vs. Weight
Mass and Weight in Zero Gravity
Scales

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3. Mass Mass – the amount of matter inside an object
Measured using a balance compared to a known amount of matter (known mass)
__________
Mass doesn’t depend on location
Your mass would be the same anywhere in the Universe because the amount of matter inside you is the same everywhere in the Universe

4. Weight Weight – The force of gravity on an object
Weight is measured on a scale
_________
Weight changes based on location as each location has a different amount of gravity
If you were to travel to a different planet (i.e. Mercury which has much less gravity), your weight would change

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6. Gravity
Everything produces gravity. The Earth pulls on you but you also pull back on the Earth
The more massive an object is, the more gravity it produces
Therefore, large objects like the Earth, Sun, etc., create a much larger gravitational attraction then you do
___________

7. Calculating Weight __________ F (Weight or Force of gravity) = m x a
The Metric system uses the acceleration due to gravity of ~10 m/s2 and gives weight in Newtons (N)
The Imperial (Standard/American) system uses the acceleration due to gravity of 32 ft/s2 and gives weight in pounds

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9. Metric System Example
If a 20 kg object experiences an acceleration due to gravity of 10 m/s2, what will be its weight in Newtons?
Answer:
Weight = Mass x Acceleration
Weight = 20 kg x 10 m/s2
Weight = 200 N

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11. Check Your Understanding
A 100 kg person stands on a scale on the Moon looks down and sees a reading of 160 N, what is the acceleration due to gravity on the Moon?

12. Imperial (Standard) System Example
If an object which has a mass of 5 slugs (pound-mass) and experiences an acceleration due to gravity of 32 ft/s2, what will be its weight in Pounds?
Answer:
Weight = Mass x Acceleration
Weight = 5 slugs x 32 ft/s2
Weight = 160 lbs.

13. Check Your Understanding
If an object which has a weight of 180 pounds and experiences an acceleration due to gravity of 32 ft/s2, what is its mass in slugs/pounds-mass?

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15. Check Your Understanding
You have a mass of 50 kg on Earth. If you go to Jupiter which has a gravity that is 2.34 times greater than Earth’s:
what will your mass be?
what will your weight be in Newtons?

16. Mass vs. Weight Mass Weight Definition How its measured Location
The amount of matter inside an object
A measure of the pull of gravity on an object
How its measured
On a balance compared to a known mass
On a scale
Location
Doesn’t change no matter location
Changes based on location. Larger planets have more gravity which would cause an increase in weight
Unit(s) of measurement
Kilograms (kg)
Slugs or Pound-mass
Newtons (N)
Pounds (lbs)

17. Mass vs. Weight - Review
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18. Mass and Weight in Zero Gravity
Where do we feel zero gravity?
______
What happens to mass and weight in zero gravity?
Mass – ________
Weight – _______
___________

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20. How Much Does Thor’s Hammer Weigh? Connecting Mass, Weight and Density
When you have completed the video answer the following question:
What property (mass, weight or density) makes Thor’s hammer so destructive? Explain your answer using terms we’ve discussed so far.
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