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Newton's laws of motion (F = ma (Lift problems (When a = 0, T = mg…
Newton's laws of motion
Force and acceleration
Newton's first law of motion
An object will stay at rest or at a constant velocity unless acted upon by a force
Newton's second law of motion
The resultant force on a body is equal to its mass multiplied by its acceleration
Newton's third law of motion
For every force, there is an equal and opposite force
Weight
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When an object is in equilibrium, the support force on it is equal and opposite to its weight
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F = ma
Where F1 > F2:
resultant force, F1-F2 = ma
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Lift problems
When a = 0, T = mg (tension = weight)
When moving upwards and accelerating, a > 0
T = mg+ma > mg
When moving upwards and decelerating, then a <0
T = mg+ma < mg
When moving downwards and accelerating, a <0
T = mg+ma < mg
When moving downwards and decelerating ,a > 0
T = mg+ma > mg
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Terminal speed
Drag force factors
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The viscosity of th fluid, which is a measure of how easily the fluid flows past a surface
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