The Feynman Lectures on Physics
John Denker
See reference 1.
1 Some Observations

[bug]
Starting on page 44: Weight is a force, and the book
measures weight in pounds. There is an illfounded rumor that the
pound is a measure of force, but according to US regulations the pound
is defined as a measure of mass, and always has been, as far as I can
tell. For details, see reference 2.

On page 44, equation 4.3 leaves no doubt that
“weight” is synonymous with the “force of gravity”. Similarly,
on page 46, g evidently denotes the local acceleration of gravity.
Furthermore, equation 4.6 implies that the weight W is equal to
mg. This is OK. I mention it only by way of contrast with item 4.

On page 45: Epitaph of Stevinus

On page 71 and again on page 79, we find
Newton’s law of universal gravitation, «F = G m m′ / r^{2}». Also,
on page 129, combining equation 12.8 and 12.9, we find another
statement of this law, applicable to extended bodies (not just point
particles). This is a problem, because this “force of gravity” is
numerically and conceptually different from the “force of gravity”
in item 2.

[bug]
On page 88, the acceleration is given as «a =
dv/dt = 32». According to modern practice, this fails the
basic dimensionalanalysis check. It should be 32 ft/s^{2}.

On page 92, we find the second law of motion: «F = m
dv/dt = m a».

On page 125, the notion of pseudoforce is
introduced.

[bug]
On page 129, in equation 12.9, there
should be a summation sign on the RHS.
2 References


Feynman, Leighton and Sands,
The Feynman Lectures on Physics
(three volumes; AddisonWesley, Reading, MA, 1963–1965).

John Denker,
“Definition of Weight, Gravitational Force, Gravity, g,
Latitude, et cetera”
www.av8n.com/physics/weight.htm