Reprint, with new ch. 10. Originally published: 1st ed. Garden City, N.Y. : Doubleday, 1972

Includes indexes

Includes bibliographical references (pages 231-236)

How do we know what we know? -- Definitions, experiments, and the laws of motion -- The four forces of the physicist -- The gravitational force -- The conservation laws: historical background -- The conservation laws: modern experiments -- The principle of relativity -- Electromagnetism -- What is forbidden? -- Epilogue (1989) -- Appendix I. Wavelengths, frequencies, and energy -- Appendix II. Energy and momentum relationships for moving particles -- Appendix III. The Michelson-Morley and Kennedy-Thorndike experiments

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