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Free Fall, Force, Mass - Part 2

# Free Fall, Force, Mass - Part 2 - Newtons laws of motion...

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Newton’s laws of motion

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Recall… It requires a Force to change an object’s velocity We use springs to measure Forces Forces are vectors (Unit: Newton ) Mass is a measure of “quantity of matter” We use balances to measure mass i.e. we compare the weight (= gravitational force ) Mass is a scalar (Unit: kg )
An object moves at constant velocity if there is no net force acting on it. Objects at rest stay at rest. Moving objects need a force to change their velocity . Inertia is a measure of an object’s resistance to changes in its motion . Newton’s First Law of Motion . (Law of Inertia)

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F Tension v v Δv BEFORE the string breaks

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v Δv = 0 AFTER the string breaks F Tension = 0 = v
Question A single force is acting on an object. Which type of motion is not physically allowed? A) the object speeds up B) the object is at rest C) the object slows down D) the object's motion changes direction

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The acceleration of a body is directly proportional to the net force acting on the body and inversely proportional to the body’s mass .
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