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Newton’s 1st law
No resultant force = no change in motion
Newton’s 2nd law
F = ma
F IS THE RESULTANT FORCE
What is the relationship between force and acceleration?
Directly proportional
What is the relationship between mass and acceleration?
Inversely proportional
Newton’s 3rd law
Every force has an equal (magnitude) and opposite (direction) reaction force
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For every action, we have to have an equal and opposite reaction
What conditions within the forces have to be met for Newton’s 3rd law to apply?
The forces have to be the same type (e.g. push and push or pull and pull)
Why does the concept of sitting on your chair not satisfy Newton’s 3rd law?
Your body is being pulled down to Earth due to your weight, but the chair is pushing back up. Pull and push are 2 different types of forces