HELP: Original Lessons on Newton's Laws
| Site: | Mountain Heights Academy OER |
| Course: | Physics Q4 |
| Book: | HELP: Original Lessons on Newton's Laws |
| Printed by: | Guest user |
| Date: | Friday, 4 April 2025, 11:32 AM |
Description
These are the original lessons on Newton's Laws of Motion from Q1. Review as needed.
Newton's Laws of Motion Overview
Watch the following video about Newton's Laws:
Mass vs. Weight
Mass and weight are not the same thing. Mass is the amount of matter in an object. Weight is the force of gravity on an object. Objects have weight because gravity is accelerating them towards the center of the Earth. Newton's 2nd Law tells us that F=ma. That means that an object's weight will be equal to the object's mass multiplied by acceleration due to gravity. If we write Newton's 2nd Law in terms of the units involved, we see
- Units for mass are kilograms, and units for weight are Newtons (or sometimes pounds if we're not using SI units).
- Mass is a scalar quantity, but weight is a vector quantity since it has a downward direction.
- An object's mass will not change, but its weight may change based on location. For instance, and object that weighs 150 lbs on Earth will weigh 351 lbs on Jupiter, or 9 lbs on Pluto. You weight can even change based on your elevation on Earth. If you weigh 100 lbs at sea level, you will weigh 99.72 lbs at the top of Mt. Everest.
Watch the following video about the difference between mass and weight:
Equilibrium (Balanced Forces)
Watch the following videos about equilibrium:
Newton's 1st and 2nd Laws
Watch the following videos that connect Newton's First and Second Laws of Motion:
Historical Context of Newton's 1st Law
Newton's First Law of Motion
Newton's Second Law of Motion
Calculations with Newton's First and Second Laws
Newton's 3rd Law of Motion
Watch the following video about Newton's 3rd Law of Motion:
Newton's 3rd Law of Motion
Watch the following video about Newton's 3rd Law of Motion: