# Physics - Introductory﻿

If you're experiencing inertia when it comes to learning physics, gain some momentum by studying these essential terms. You'll review force and energy, electricity and magnetism, simple machines, and more.
183 words 1,532 learners

### Full list of words from this list:

1. absorb
suck or take up or in
2. absorption
when radiated energy is retained on passing through a medium
3. acceleration
(physics) a rate of increase of velocity
4. action
something done (usually as opposed to something said)
5. ampere
the basic unit of electric current adopted under the Systeme International d'Unites
6. amplitude
the maximum displacement of a periodic wave
7. atom
the smallest component of an element
8. attraction
the force that one object exerts on another
9. axle
a shaft on which a wheel rotates
10. bar magnet
a magnet in the form of a bar with magnetic poles at each end
11. battery
a device that produces electricity
12. brightness
the quality of being luminous; emitting or reflecting light
13. calorie
unit of heat raising 1 gram of water by 1 degree centigrade
14. charge
the quantity of unbalanced electricity in a body
15. chemical energy
that part of the energy in a substance that can be released by a chemical reaction
16. circuit
an electrical device providing a path for current to flow
17. closed circuit
a complete electrical circuit around which current flows or a signal circulates
18. collision
a brief event in which two or more particles come together
19. color
a visual attribute of things from the light they emit
20. compass
21. compression
the process of becoming smaller or pressed together
22. conduct
transmit or serve as the medium for transmission
23. conduction
the transmission of heat or electricity or sound
24. conductivity
the property of transmitting heat, electricity, or sound
25. conductor
a substance that readily serves as a medium for transmission
26. conservation
maintenance of constant physical or chemical quantities
27. conservation of energy
the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes
28. conservation of momentum
the principle that the total linear momentum in a closed system is constant and is not affected by processes occurring inside the system
29. convection
transfer of heat caused by molecular motion in liquid or gas
30. conversion
an event that results in a transformation
31. crest
the top line of a hill, mountain, or wave
32. current
a flow of electricity through a conductor
33. deceleration
(physics) a rate of decrease in velocity
34. diffraction
process by which light changes passing through a narrow slit
35. direction
relation between something and the course on which it moves
36. distance
the size of the gap between two places
37. drag
the phenomenon of resistance to motion
38. elasticity
39. electric
using or providing the flow of charge through a conductor
40. electric charge
the quantity of unbalanced electricity in a body (either positive or negative) and construed as an excess or deficiency of electrons
41. electric current
a flow of electricity through a conductor
42. electrical
using or providing or producing or transmitting or operated by electricity
43. electrical circuit
an electrical device that provides a path for electrical current to flow
44. electrical energy
energy made available by the flow of electric charge through a conductor
45. electricity
a physical phenomenon that can produce light, heat and power
46. electromagnet
a temporary magnet made by coiling wire around an iron core
47. electromagnetic
pertaining to or exhibiting magnetism produced by electric charge in motion
radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge
49. electron
an elementary particle with negative charge
50. emission
the act of causing to flow forth
51. emit
give off, send forth, or discharge
52. energy
the capacity of a physical system to do work
53. equilibrium
a stable situation in which forces cancel one another
54. field
space around a radiating body within which it exerts force
55. force
influence that results in motion, stress, etc. when applied
56. free fall
the ideal motion of something subject only to gravity
57. frequency
the number of occurrences within a given time period
58. friction
the resistance when a body is moved in contact with another
59. fulcrum
the pivot about which a lever turns
60. gear
a toothed wheel that engages another toothed mechanism
61. geothermal energy
energy derived from the heat in the interior of the earth
62. gravitational force
the force of attraction between all masses in the universe
63. gravity
the force of attraction between all masses in the universe
64. heat
a form of energy transferred by a difference in temperature
65. hertz
unit of frequency with a periodic interval of one second
66. hydroelectric
of or relating to or used in the production of electricity by waterpower
67. hydroelectricity
electricity produced by water power
68. impact
the striking of one body against another
69. incandescence
light emission by a body as its temperature is raised
70. inclined plane
a simple machine for elevating objects
71. inductor
an electrical device (typically a conducting coil) that introduces inductance into a circuit
72. inertia
the tendency of something to stay in rest or motion
73. insulate
surround with material to protect from heat, cold, or noise
74. insulation
reduction of the transmission of sound, heat, or electricity
75. insulator
a material with little electrical or thermal conductivity
76. intensity
the amount of energy transmitted
77. interaction
the transfer of energy between elementary particles
78. ion
a particle that is electrically charged positive or negative
79. kinetic energy
the mechanical energy that a body has by virtue of motion
80. law of conservation of energy
the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes
81. lever
a simple machine giving a mechanical advantage on a fulcrum
82. lift
the component of the aerodynamic forces acting on an airfoil that opposes gravity
83. light
electromagnetic radiation that can produce visual sensation
weight to be borne or conveyed
85. loudness
the magnitude of sound (usually in a specified direction)
86. luminescence
the emission of light without heat
87. machine
a device for overcoming resistance by applying force
88. magnet
a device that attracts iron and produces lines of force
89. magnetic
of or relating to or caused by attraction for iron
90. magnetic force
attraction for iron
91. magnetic pole
either of two points where the lines of force of the Earth's magnetic field are vertical
92. magnetism
attraction for iron
93. magnitude
the property of relative size or extent
94. mass
the property of a body that causes it to have weight
95. matter
that which has mass and occupies space
96. mechanical energy
energy in a mechanical form
97. medium
an intervening substance through which something is achieved
98. metal
a chemical element or alloy that is usually a shiny solid
99. microwave
a short electromagnetic wave
100. model
a hypothetical description of a complex entity or process
101. molecule
the simplest structural unit of an element or compound
102. momentum
the product of a body's mass and its velocity
103. motion
the act of changing location from one place to another
104. negative charge
the state of having a surplus of electrons
105. neutral
having no net electric charge
106. Newton's first law
a body remains at rest or in motion with a constant velocity unless acted upon by an external force
107. Newton's second law
the rate of change of momentum is proportional to the imposed force and goes in the direction of the force
108. Newton's third law
action and reaction are equal and opposite
109. nonrenewable
that can not be renewed
110. nucleus
the positively charged dense center of an atom
111. open circuit
an incomplete electrical circuit in which no current flows
112. parallel circuit
a closed circuit in which the current divides into two or more paths before recombining to complete the circuit
113. particle
a body having finite mass but negligible dimensions
114. peak
the highest point of something
115. pendulum
an apparatus in which an object is mounted to swing freely
116. permanent magnet
a magnet that retains its magnetism after being removed from a magnetic field
117. pitch
the high or low quality of a sound
118. pivot
axis consisting of a shaft supporting something that turns
119. positive charge
the state of having a deficiency of electrons
120. potential energy
energy stored by a body or system by virtue of its position
121. power
(physics) the rate of doing work
122. prism
optical device used to deviate a beam or invert an image
123. projectile
impelling or impelled forward
124. proton
a stable particle with positive charge
125. pulley
a wheel with a groove in which a rope can run
energy transmitted in the form of rays or waves or particles
127. ratio
relation with respect to comparative quantity or magnitude
128. reaction
the opposite force when a force is applied to a body
129. reflection
the phenomenon of a wave being thrown back from a surface
130. refraction
the change in direction of a propagating wave
131. renewable
capable of being replaced
132. repel
cause to move back by force or influence
133. resistance
any mechanical force that tends to slow or oppose motion
134. resistor
an electrical device that resists the flow of electrical current
135. scattering
the physical process in which particles are deflected haphazardly as a result of collisions
136. screw
a simple machine with a threaded cylindrical rod and hole
137. semiconductor
a substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities
138. series circuit
a circuit having its parts connected serially
139. sight
the ability to see; the visual faculty
140. simple machine
a device for overcoming resistance at one point by applying force at some other point
141. slope
the property of a line that departs from the horizontal
142. solar energy
energy from the sun that is converted into thermal or electrical energy
143. solar heater
a heater that makes direct use of solar energy
145. sound
mechanical vibrations transmitted by an elastic medium
146. sound wave
(acoustics) a wave that transmits sound
147. spectrum
an ordered array of the components of an emission or wave
148. speed
a rate at which something happens
149. static electricity
electricity produced by friction
150. strain
deformation of a body under the action of applied forces
151. stress
(physics) force that produces strain on a physical body
152. surface
the outer boundary of an artifact or a material layer
153. switch
device for making or breaking the connections in a circuit
154. system
a group of independent elements comprising a unified whole
155. temperature
the degree of hotness or coldness of a body or environment
156. tension
a stress that produces an elongation of a physical body
157. terminal
a contact on a device at which current enters or leaves
158. thermal
relating to or associated with heat
159. thermal equilibrium
a state in which all parts of a system are at the same temperature
160. thrust
the force used in pushing
161. time
the fourth coordinate required to specify a physical event
162. transfer
the act of moving something from one form to another
163. transformation
the act of changing in form or shape or appearance
164. transmission
fraction of radiant energy that passes through a substance
165. transmit
serve as the medium for sending something
166. transverse
extending or lying across, in a crosswise direction
167. vacuum
the absence of matter
168. velocity
distance traveled per unit time in one direction
169. vibration
(physics) a regular periodic variation in value about a mean
170. visible
capable of being seen or open to easy view
171. visible light
(physics) electromagnetic radiation that can produce a visual sensation
172. vision
the ability to see
173. volt
a unit for measuring the force of an electric current
174. voltage
difference in electrical charge between points in a circuit
175. watt
a unit of power equal to 1 joule per second
176. wave
(physics) a movement up and down or back and forth
177. wavelength
distance between successive crests of a periodic disturbance
178. wedge
something solid that can be pushed between two things
179. weight
the vertical force exerted by a mass as a result of gravity
180. wheel
a simple machine consisting of a circular frame with spokes (or a solid disc) that can rotate on a shaft or axle (as in vehicles or other machines)
181. wheel and axle
hoist so arranged that a rope unwinding from a wheel is wound onto a cylindrical drum or shaft coaxial with the wheel
182. wind power
power derived from the wind (as by windmills)
183. work
a manifestation of energy
Created on February 23, 2017 (updated April 20, 2017)