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# 2. Newton’s Three Laws of Motion

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#### About this Lecture

Lecture

In this mini-lecture we discuss Newton’s Three Laws of Motion. As we move through this mini-lecture we consider: (i) Newton’s First Law (also known as the Principle of Inertia), which states that an object will not change it’s motion unless acted upon by a force, and that if the object is at rest then it will stay at rest unless a force is present; (ii) Newton’s Second Law, which relates force, mass, and acceleration through the equation F = ma, where we refer to the mass m as the inertial mass; (iii) Newton’s Third Law, which states that when two objects interact they apply forces on each other of equal magnitudes but opposite directions; and (iv) an Example of Newton’s Second Law that illustrates the inverse relationship between mass and acceleration.

Course

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.

Lecturer

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).

#### Cite this Lecture

**APA style**

Berman,
D.
(2022, January 12).
*Introduction to Mechanics - Newton’s Three Laws of Motion* [Video]. MASSOLIT. https://www.massolit.io/courses/introduction-to-mechanics/newton-s-three-laws-of-motion

**MLA style**

Berman,
D.
"Introduction to Mechanics – Newton’s Three Laws of Motion." *MASSOLIT*, uploaded by MASSOLIT,
12 Jan 2022,
https://www.massolit.io/courses/introduction-to-mechanics/newton-s-three-laws-of-motion