The notion of bringing technology into the classroom has been the subject of many recent presentations at conferences and papers in physics teaching journals. The use of devices such as laptops, smartphones, tablets, and clickers is rising in today's classrooms and laboratories. PhET simulations have been available online for over a decade. A column in The Physics Teacher, called “iPhysicsLabs,” was begun in February of 2012 and describes experiments to be carried out with smartphones and tablets. Students have become familiar with the operation and application of such technology. But are they aware of the underlying physics necessary to make the devices and the online simulations work? Much of the physics is hidden at the microscopic level in tiny circuit chips or in the workings of a distant server.

2.
Some iPhysicsLabs activities are found online at http://www.aapt.org/Resources/iPhysics-Labs.cfm. The first appearance of a paper in the “iPhysicsLabs” column is
J.
Kuhn
and
P.
Vogt
, “
Diffraction experiments with infrared remote controls
,”
Phys. Teach.
50
,
118
(
Feb.
2012
).
3.
J. W.
Jewett
, “
Energy and the confused student IV: A global approach to energy
,”
Phys. Teach.
46
,
210
(
April
2008
).
4.
The “sad” in sad iron is not related to emotion in this context. It is an old English word for solid or heavy. Think about the meaning of a “heavy heart.”
5.
The single-cylinder vacuum in Fig. 4(a) has been described in
J. W.
Jewett
, “
Hook your students!
Phys. Teach.
51
,
442
(
Oct.
2013
).
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