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NSW Physics review – dot points 9.2.1

The first in a series of short videos, I review the dot points in the NSW HSC syllabus. I won’t go into the full details of the physics of each point, but I will touch on them discussing the nuances of each dot point.   In this video I discuss section 9.2.1 – The Earth has a gravitational field that exerts a force on objects both on it and around it  

Optics – real image formation

So we know that lenses can magnify but why does a lens have the ability to display an image? In this video, I discuss why a converging lens can form real images as well as look at the factors that determine its characteristics. Using a clear explanation with animations, I help you understand the optics from a high school perspective  

superposition explained

In this video, I go through wave interference / superposition. I discuss constructive and destructive interference from a 1D perspective. For NSW students, it covers the content from the Year 11 World Communities unit (8.2), namely • describe the principle of superposition and compare the resulting waves to the original waves in sound  

Car Crash Physics

What are the Physics principles involving a car crash? How do forces, work, energy, and momentum apply? In this video I will discuss these terms in a way that will help you understand those concepts in the context of a car crashing in a wall – first at 60kph and then 100kph.  

Understanding Circular Motion

This video presents a beginner’s guide to circular motion, introducing the concept of centripetal force. It also briefly discusses the erroneous term centrifugal force. It also explains the motion with some common examples.   Clarification: in the video I mention that ‘there is no centrifugal force” What I mean is, there is no centrifugal force acting on the object spinning, like some outward force acting on the object. This is fictitious.   I the specific case of a car going around the bend, the centripetal force is provided by the road surface on the car, going inward   One could…

Rocket Launch Physics Explained

How do Newton’s Laws apply to a rocket launch? Using data from a simulation by Robert A. Braeunig, I present graphs of various measurements to explain Newton’s in the context of the multistage rocket Saturn V. In particular I explain how the g forces change for the astronauts as they ascend into orbit.   For those doing the NSW HSC, this video address the following dot point (though I do not specifically address LCM) analyse the changing acceleration of a rocket during launch in terms of the: – Law of Conservation of Momentum – forces experienced by astronauts  

Orbital Velocity Explained

In this video I discuss the connection between gravity and circular motion, involving satellites. I thus derive the formula used for orbital velocity of a satellite moving in a circular path   For those doing the HSC Physics course, this video addresses the following dot points • analyse the forces involved in uniform circular motion for a range of objects, including satellites orbiting the Earth • define the term orbital velocity and the quantitative and qualitative relationship between orbital velocity,the gravitational constant, mass of the central body, mass of the satellite and the radius of the orbit using Kepler’s Law…

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