When viewed in an inertial reference frame, an object either remains at rest or continues to move at a constant velocity, unless acted upon by an external force.^{[2]}^{[3]}

Second law:

The vector sum of the external forcesF on an object is equal to the massm of that object multiplied by the acceleration vectora of the object: F = ma.

Third law:

When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body

The way that I remembered (and still do) Newton's Laws of Motion.
The first law - Inertia = I made up a hyphenated word "One - ertia"
The Third Law - equal and opposite = a sideways 3 - turn the three so the
openings of the three are upward - each side of the sideways three is
"equal and opposite"
Once I know which the 1st and third are - the second is the only one left.
acceleration is directly related to the force applied If I push down the
gas pedal in 2nd gear - I accelerate in direct proportion to the force on
the gas pedal.

May 5th, 2015

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