Hewitt-Drew-it! 44. Weightlessness

Phil Physiker contrasts mg with and without a support force.

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Immovable Object vs. Unstoppable Force - Which Wins?

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Hewitt-Drew-it! 27. Freddy-Frog Momentum Problem

Paul explains two ways that Freddy the Frog slows a horizontally-moving skateboard by vertically falling on it.

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Hewitt-Drew-it! 21. Newton's Third Law

Paul and wife Lil illustrate that one cannot touch without being touched — with supporting examples.

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Hewitt-Drew-it! 19. Newton's Second Law

A video of Paul in the classroom is followed up with a discussion of force, mass, and the acceleration of freely-falling rocks.

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The Standard Model

Fermilab scientist Don Lincoln describes the Standard Model of particle physics, covering both the particles that make up the subatomic realm and the forces that govern them.

 

Hewitt-Drew-it! 16.Newton's Laws of Motion

Paul enlists Nellie Newton to illustrate Newton's three laws of motion.

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IDTIMWYTIM: Centrifugal Force

In this edition of IDTIMWYTIM, Hank addresses the so-called centrifugal force, and explains why you really mean centripetal force.

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Hewitt-Drew-it! 5. Nellie hanging on Gym Ropes

Paul shows two different ways of solving vector problems; resolution of vectors and the parallelogram method. Paul also shows a pulley problem.

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Hewitt-Drew-it! 4: Nellie's Rope Tensions

Paul Hewitt explains how vectors are used to figure out forces and equilibrium. Paul uses a parallelogram rule to find resultant tensions.

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Hewitt-Drew-it! 3:Net Force & Vectors

Paul Hewitt explains how vectors are used to figure out forces and equilibrium.

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Hewitt-Drew-it! 1: Equilibrium Rule

Paul G.Hewitt (author of "Conceptual Physics") explains equilibrium by drawings so everyone can understand the topic. This is the first in a series.

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What is a Force?

Force is a central concept in physics. By analysing the forces on an object, its resulting motion can be determined. But what exactly is a force? The word force is used in everyday language in a variety of contexts, only some of which reflect the scientific definition of force. In this video, people at Victoria Park in Sydney are interviewed on their ideas of force and the forces that act on them.

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