Mass vs Weight
PhySci 4.10
Attendance Link: http://goo.gl/forms/mSaiWYCv9o
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Understanding Mass and Weight: A Physics 4.10 Class Overview, Exams of Physics
An overview of a Physics 4.10 class on the topics of mass and weight. Students are expected to attend classes on Tuesdays, Wednesdays, and Thursdays from 10:30-11:30 am and participate actively. the concepts of mass and weight, their differences, and how they are measured. It also includes examples and exercises to help students understand the concepts.
What you will learn
- How is mass measured?
- What is the relationship between mass and inertia?
- How is weight measured?
- What is the difference between mass and weight?
- How does the weight of an object change depending on its location?
Typology: Exams
2021/2022
1 / 25
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Mass vs Weight
PhySci 4.
Attendance Link: http://goo.gl/forms/mSaiWYCv9o
Expectations Required Class Connects Tuesday, Wednesday, & Thursday 10:30-11:30 am Be active and participate in class. Be respectful to your classmates Be positive in the chat box and use it correctly. Have a working microphone! You will need it during the lessons and break out rooms. If you have a question, please place it in the chat box and repost it if I don’t see it.
Mass
Mass is a measure of how much matter is in an object. The quantity of matter that an object contains.
Mass
Your mass is the same wherever you are, here on Earth, on the moon, or in space! Your mass never changes, that’s because the amount of stuff you are made of doesn’t change. CHANGE
Weight
Weight is a measure of the force of gravity acting upon an object Q: If a book is transported from earth to the planet Mars, is the weight going to stay the same? No, why? Earth and Mars don’t have the same gravity.
Weight
Weight is measured using a scale Weight is measure in Newtons Why do you think the unit for weight is newtons?
The 5 lb bag of flour on Earth weighs only .8 lbs on the moon!
Mass and Inertia
Remember that the greater the object’s mass the greater its inertia. What is going to take more energy to get moving an elephant or a chicken? An elephant, why? Because the elephant has more mass!
Weight is a Force
Weight is the pull of gravity on an object, it is a force. Weight is the mass of an object times the acceleration due to gravity.
w = m x g
w = mg
Weight in Newtons Acceleration of gravity, symbolized by “g” is equal to 9.8 m/s 2 At or near the earth’s surface, gravity tries to accelerate objects 9. m/s faster each second Mass in kg
w = m x g
What is the weight of a 70-kg person on earth? Remember that acceleration due to gravity on earth is 9. m/s 2 . w = 70kg * 9.8m/s 2 w = 686 kgm/s 2 w = 686 N N is for Newton which is the same as kgm/s 2
Find the weight
- A car as a mass of 1500 kg. What is its weight of the car on earth? w = 1500 kg x 9.8m/s 2 w = 14700 N
- A cat as the weight of 20N. What is its mass? 20N = m x 9.8 m/s 2 Divide each side by 9.8m/s 2 m = 2.041 Kg