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Introduction to Mechanics

5. Example of Newton’s Third Law

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In this final mini-lecture, we go through an example that illustrates Newton’s Third Law. In particular, we: (i) focus on the concept of equal and opposite forces; (ii) use Newton’s Second Law F = ma to calculate acceleration; (iii) use s = a∆t to calculate speed; and (iv) note that acceleration and speed are directly proportional when ∆t is held constant.


In this course, Professor David Berman (Queen Mary University of London) gives an introduction to mechanics at a GCSE level. In the first mini-lecture, we define distance, speed, and acceleration before looking at how they are related mathematically and graphically in distance versus time graphs and speed versus time graphs. In the second mini-lecture, we discuss Newton’s Three Laws of Motion. In the third mini-lecture, we explore gravity, weight, and the acceleration due to gravity (g). The fourth mini-lecture introduces momentum and the relationship between momentum and force. In the fifth mini-lecture, we go over an example that illustrates Newton’s Third Law.


David Berman is a Professor of Theoretical Physics at Queen Mary. His research interests include string theory and ideas in fundamental theoretical physics, including non-commutative geometry, black holes physics, and quantum gravity. He has contributed to the Radio 4 biography series Great Lives and the In Our Time podcasts, including Great Lives: Richard Feynman (2018), Great Lives: Galileo (2019), In Our Time: Emmy Noether (2019), and In Our Time: Paul Dirac (2020).

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APA style

Berman, D. (2022, January 12). Introduction to Mechanics - Example of Newton’s Third Law [Video]. MASSOLIT.

MLA style

Berman, D. "Introduction to Mechanics – Example of Newton’s Third Law." MASSOLIT, uploaded by MASSOLIT, 12 Jan 2022,

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