​Newton's 1st Law

​Objects maintain their same state of motion - AT REST or MOVING AT A CONSTANT VELOCITY - unless acted on by an unbalanced force.

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Unbalanced forces result in an ACCELERATION.

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​Also known as the Law of INTERTIA

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​Newton's 1st Law

​Inertia is related directly to an object's mass. The more mass, the more inertia.

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​The more inertia, the more the object wants to maintain it's current state of motion - AT REST or MOVING AT A CONSTANT VELOCITY

​Finding net force

​Add (and subtract) forces in the horizontal.

​Add (and subtract) forces in the vertical.

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​Do you get a net force of 0 N? No acceleration.

​Do you get a net force of anything other than 0 N? ACCELERATION!

​Newton's 2nd Law

​F = ma

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​If a certain amount of force is applied to a small mass, that mass will experience a large acceleration.

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​If that same amount of force is applied to a larger mass, that mass will experience a small acceleration.

​Newton's 3rd Law

​For every force there is an equal and opposite force.

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​Equal in MAGNITUDE (how many Newtons of force)

​Opposite in DIRECTION

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​ALL forces come in pairs. The forces don't cancel out because they are acting on DIFFERENT objects!

​In this example, the swimmer would be accelerated forward by the equal force because her mass is smaller than the wall (F= ma)