## University Physics - chapters 2 and 4

##### Created by:

aliciafeliz  on September 24, 2010

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# University Physics - chapters 2 and 4

 vectora quantity having both magnitude and direction
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#### Definitions

vector a quantity having both magnitude and direction
scalar a quantity that has magnitude only
resultant the vector sum of two or more vectors
direction angle angle corresponding tot he direction of a vector, usually referenced to the positive horizontal, usually symbol is θ, with a subscript for the vector
components of a vector the horizontal and vertical projections of a vector
force a push or a pull
net force the vector sum or resultant of two or more forces acting on an object
first law of motion an object will not experience a change in velocity unless acted upon by an external force. "Rest" is a special case of v = 0 when the external net force is zero
inertial reference frame an object or place defined as being at rest
static equilibrium the condition in which an object is at rest because the net force on it is zero
second law of motion for objects moving at non-consistent velocity, the acceleration equals the net force divided by the mass or a = ∑F/m
weight gravitational force on an object, when acceleration is g; F = ma becomes w = mg

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