Gravitational Force		The change in angular velocity divided by the time required to make the change.
Elasticity		Number of oscillatims in pressure each second heard as pitch.
Wavelength		The change in direction or bending of light at the boundary between two media.
Frequency		What mirror reflects light from its inner curved surface.
First		The incident angle that causes the refracted ray to lie right along the boundary of the substance is unique to the substance.
Angular Acceleration		Particles of a medium vibrate perpendicularly to the direction of the motion of the wave.
Surface		The perpendicular distance from the axis of rotation to the point where the force is exerted.
Real image		Combination of transverse and longitudinal water waves.
Power		Determines speed of light in the medium.
Vibrates		Work done devided by the time taken to do the work.
Optical density		This wave needs a medium through which they can travel.
Diffraction		Particles of a medium travel parallel to the direction of the wave.
Centripetal Force		Light rays converge at a point (can be projected onto a screen).
Critical Angle		The bending around obstacles.
Lever Arm		Which of Kepler's law states that the planets move in elliptical orbits, with the sun at one focus?
Virtual image		The net force of an object moving in a circle towards the center of the circle.
Concave		The speed of sound depends on ...
Mechanical		The distance from one crest to the other crest.
Longitudinal		The force of attraction between two objects must be proportional to the object's masses.
Refraction		Light rays do not converge at a point (can't be projected on a screen).
Transverse		Source of all waves is something that ...