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Speed |
An object's (instantaneous) speed is the magnitude of its (instantaneous) velocity vector. The SI unit for speed is meters per second ($\mathrm{m/s}$). |
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SpeedOfLight |
The speed of light in a vacuum, $c$, is a universal physical constant exactly equal to $2.99792458 \times 10^8 \frac{\mathrm{m}}{\mathrm{s}}$. |
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SpeedTable |
A speed table displays an object's instantaneous speed at equal time intervals. |
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SPEEqnUnits |
The equation for spring potential energy is $\text{SPE}=\frac{1}{2} k x^2$, where $\text{SPE}$ is the spring's potential energy, in joules, $k$ is the spring constant, in newtons per meter, and $x$ is the displacement from the equilibrium position, in meters. |
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SphericalMirrorCurvatureFocus |
A spherical mirror has a single center of curvature. Its distance is twice the focal length from the mirror. |
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SpringPotentialEnergy |
Spring potential energy (also called elastic potential energy) is the energy stored in a spring when it is compressed or stretched from its equilibrium position. |
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Start |
An object starts to move when it has not moved for a while, and then moves. |
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StatementPlaceholder |
Statement placeholder value |
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Stop |
A object, that had been moving, and then does not move for a while, has stopped. |
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SunMass |
The Sun's mass is $1.99 \times 10^{30}$ kg. |
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TerminalSpeed |
Terminal speed is the speed at which the magnitude of the force of fluid resistance on a falling object is equal to the magnitude of the gravitational force on the object. |
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Time |
Definition of time TBD. The SI unit for time is the second, $\textrm{s}$. |
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TimeInterval |
A time interval, or time period, is a portion of time that begins and ends at specific instants. |
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TopOfFlight |
At the highest point of an object's trajectory, the vertical component of the object's velocity is zero. |
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TotalInternalReflection |
At the interface of media having indices of refraction $n_\text{1}$ and $n_2$, with $n_1 > n_2$, there is a critical angle $\theta_\text{c}$ given by $n_1 \sin \theta_\text{c} = n_2 \sin \theta_2$. For angles of incidence $\theta_1 > \theta_\text{c}$ , all of the light is reflected and follows the law of reflection. |
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Translucent |
Translucent materials transmit some light. |
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Transmission |
Transmission is when light goes through an object. |
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Transparent |
Transparent materials transmit a lot of light. |
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UnbalancedForceStart |
If unbalanced forces act on a stopped object, the object will start to move, and the motion will be in the direction of the force. |
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UnbalancedForceVelChange |
Unbalanced forces acting on an object change the object's velocity. |
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VectorQuantity |
A vector quantity is the product of a Euclidean vector and a unit of measurement. |
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VelAreaIsPosChange |
For an object in one-dimensional motion, on a velocity-time graph, the area under the curve between two times (clock readings), is the change of position during that time interval. |
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VelChangeForceDurationMass |
Given a constant net force $F_{\text{net}}$ acting on an object of mass $m$ for a duration $t_{2}-t_{1}$, the object's change of velocity is $v_{2}-v_{1}=\frac{F_{\text{net}} \times \left(t_{2}-t_{1}\right)}{m}$. |
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Velocity |
An object's (instantaneous) velocity is the instantaneous rate of change of its position. The SI unit for the magnitude of velocity is meters per second ($\mathrm{m/s}$). |
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VelSlopeIsAccel |
For motion in one dimension, the slope of the tangent to the graph of velocity v. time at a particular time (clock reading) is the instantaneous acceleration at that time. |
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VirtualImage |
A virtual image is the apparent source of light rays. |
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Weight |
The weight of an object is the magnitude of the gravitational force on the object. |
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WhiteLightColors |
White light consists of different colors of light. |
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ZeroAccelSameVel |
An object having a zero acceleration during a time interval will have the same velocity at the beginning and end of the time interval. |
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ZeroVelSamePos |
An object having a zero velocity during a time interval will have the same position at the beginning and end of the interval. |
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