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21 Cards in this Set
- Front
- Back
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vector
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a quantity having both magnitude and direction
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Scalar
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A quantity that has magnitude only
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Resultant
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The vector sum of two or more vectors
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Direction angle
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Angle corresponding to the direction of a vector, usually referenced to the positive horizontal; usual symbol theta is , with a subscript for the vector
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Components of a vector
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The horizontal and vertical projections of a vector
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Force
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A push or pull
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Net force
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The vector sum or resultant of two or more forces acting on an object
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First law of motion
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An object will not experience a change in velocity unless acted upon by an external net force.
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Inertial reference frame
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An object or place defined as being at rest
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Static equilibrium
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The condition in which an object is at rest because the net force on it is zero
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Second law of motion
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For objects moving at non constant velocity, the acceleration equals the net force divided by the mass, or A equals the sum of the force divided by mass
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Weight
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Gravitational force on an object, when acceleration is G; force equals mass times acceleration becomes weight equals mass times gravity.
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Third law of motion
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For every action, there is an equal and opposite reaction, example for every force force exerted on an object, a force - force is exerted by the object back on the source of the force.
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Free body diagram
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a sketch Showing all forces acting on an object.
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normal force
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a force exerted normal or perpendicular to the surface of contact by the surface an object is on.
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Friction factor
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Proportionally constant between friction force and normal force, it is determined experimentally..
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1 Radian
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The angle subtended, intercepted, by an arc of length equal to the radius of the circle of motion.
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Uniform circular motion
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Motion in a circle of unchanging radius
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t a n g e n t I a l velocity
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The velocity of an object and circular motion tangent to the circle
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radial acceleration
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The acceleration required to force an object into a circle of motion, which keeps it from moving in a straight line.
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Radial force
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The force exerted on an object to force it into circular motion, also centripetal force .
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