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IGCSE Physics presentation

Jonathan Bowen

on 5 August 2010

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Transcript of MECHANICS 1

Speed, velocity and acceleration Length and time Mass and weight
density What is mass? "all particles had no mass just after the Big Bang. As the Universe cooled and the temperature fell below a critical value, an invisible force field called the ‘Higgs field’ was formed together with the associated ‘Higgs boson’. The field prevails throughout the cosmos: any particles that interact with it are given a mass via the Higgs boson. The more they interact, the heavier they become, whereas particles that never interact are left with no mass at all."
http://public.web.cern.ch/public/en/science/higgs-en.html No really what is it?
Ok you may describe mass as "a measure of the amount of substance in an object" but be careful it is not the amount of substance in an object! Physicists use mass to describe how an object behaves.
Objects with a large mass pull other objects towards them more strongly
It is harder to make objects with a large mass change speed or direction Mass is measured in kilograms using a balance The force that a mass exerts
because of gravity is it`s weight Weight is a force
measured in Newtons (N) on Earth the weight can be calculated
as mass (in kg) x 9.81 (10) now try q 1 on p 20 Units starter - p13
try all questions
you have 5 minutes Aims
Know the SI units for length mass and time
Know what is meant by mass
Know that weight is a force
Know that weights and masses can be compared
using a balance
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