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- Physics Terms

Drew P.

Uniform Motion

Straight line motion in which equal displacements occur during any successive equal time intervals

Turning Point

a point where the velocity is instantaneously zero as the particle reverses direction

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Uniformly accelerated motion

motion that has acceleration that is constant and unchanging. V(t) is a straight line and the slope is a_{s}

Free fall

When an object is moving under the influence of gravity only

Vector Quantity

A quantity having both size and direction

Magnitude

Length or size of a vector (magnitude is a scalar quantity)

Resultant Vector

Sum of two vectors

Component vectors

Vectors of magnitude 1 parallel to the x,y, or z axes.

Centripetal Acceleration

Acceleration that always points towards the center of a circle

Projectile

an object that moves in two dimensions under the influence of only gravity.

Launch Angle

the angle of the initial velocity above the horizontal reference point (usually x-axis)

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Reference Frame

A coordinate system in which an experimenter makes position and time measurements of physical events. Separate individuals have their own reference frames

Inertial Reference Frames

Reference Frames that move with constant speed and in a straight line

Galilean Transformation of Position

If we know where and when an event occurred in one reference frame, we can transform that position into any other reference frame that moves relative to the first with constant velocity V. (x=x'+V_{x}t OR x'=x--V_{x}t)

Uniform Circular Motion

A particle that moves at constant speed around a circle of radius r. Occurs only if angular velocity ωω is constant and unchanging

Period of Motion

Time interval required for the particle to go around the circle once, completing one revolution.

Angular position

Used along with r to describe position of a particle in circular motion, represents the angle from the positive x-axis.

arc length (s)

Distance around the circle the particle travels of radius R

Radians are

Arc length / radius or S/r

Angular displacement

The change in a particles angle over a specific time interval

Angular Velocity

derivative of Angular Velocity/Time IntervalDenoted--ω

nonuniform circular motion

Circular motion with a changing speed

Tangential acceleration

Acceleration vector that is parallel with velocity vector and always tangent to the circle

Radial Acceleration

Acceleration vector that points towards the center of the circle

Nonuniform circular Acceleration

Does not point towards the center of the circle, points ahead if particle is speeding up, and behind if it is slowing down.

Angular Acceleration

the rate at with the angular velocity ω changes. denoted-αIt equals the derivative of ω.

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