Notecard 1 - Terms • Mass is the amount of material...

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Unformatted text preview: Terms • Mass is the amount of material contained in an object – fixed quantity • Weight is the force needed to support an object against the Earth’s gravitational pull • Leading zeros are not significant • Zeros and numbers after the decimal are significant • Zeros inside a number are significant • Zeros at the end of a whole number may not be significant • Vector – has both magnitude (size or amount) and direction • Scalar – has only magnitude • The net force is defined as the vector sum of all forces acting on an object • Newton’s laws: I: An object at rest will remain at rest unless acted upon by an external and unbalanced force. An object in motion will remain in motion unless acted upon by an external and unbalanced force . • II: The rate of change of momentum of a body is proportional to the resultant (net) force acting on the body and is in the same direction . (Fnet=ma) o Unit of Force : 1kg•1m/s2 = 1kg•m/sec2 = 1 Newton (N) • III: All forces occur in pairs, and these two forces are equal in magnitude and opposite in direction...
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