Physics has the reputation of being difficult to understand and remote
from everyday life. Robert Ehrlich, however, has spent much of his
career disproving these stereotypes. In the long-awaited sequel to
Turning the World Inside Out and 175 Other Simple Physics
Demonstrations, he provides a new collection of physics
demonstrations and experiments that prove that physics can, in fact,
be "made simple." Intentionally using "low tech" and inexpensive
materials from everyday life, Why Toast Lands Jelly-Side Down
makes key principles of physics surprisingly easy to
understand.
After laying out the basic principles of what
constitutes a successful demonstration, Ehrlich provides more than 100
examples. Some of the more intriguing include: Terminal Velocity of
Falling Coffee Filters; Spinning a Penny; Dropping Two Rolls of Toilet
Paper; Avalanches in a Sand Pile; When to Add the Cream to Your
Coffee; Deep Knee Bends on a Bathroom Scale; Recoil Force on a Bent
Straw; Swinging Your Arms While Walking; Estimating the Net Force on a
Moving Book; and, of course, Why Toast Lands Jelly-Side
Down.
The book begins with a practical introduction on how to
design physics demonstrations. The benefits of designing one's own
"demos" are numerous, but primary among them is an increased
understanding of basic physics. For many people who teach the
principles of physics, demonstrations seem dauntingly complex, filled
with hard-to-find equipment and too many possibilities for failure.
The demonstrations described in this book are exactly the opposite.
Ehrlich describes them with characteristic candor: "You can fit many
of them in your pocket, bring them to your class without any set-up
required, and best of all, you need not fear that your demo will more
likely illustrate Murphy's laws rather than Newton's."
For
anyone with even the slightest interest in physics, Why Toast Lands
Jelly-Side Down is filled with learning opportunities. For
everyone who is studying physics or teaching the subject at any level,
from amateur scientists to professional teachers, it is an essential
resource.
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