7K+Forces

=__ 7K Forces and their effects __=

__**Dulwich resources**__ http://789science.wikispaces.com/Forces+and+their+effects http://dcsks3science.wikispaces.com/That+floating+feeling

__**Homework 1:**__ Homework is a short one, please make notes in your book whilst completing the following-

Densities of metals can be found in the link below - note the units are kg/m3 and we measured our blocks in g/cm3,

1. Choose three metals for which you calculated densities in class. Multiply the density by 1000 to convert your density units to the websites units and see how accurate your measurements were:

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2. Is there a difference in the densities published on the internet and the densities that you calculated? 3. Write down two reasons why this might be so!

__**Buoyancy:**__ The Archimedes-principle: http://global.britannica.com/EBchecked/topic/32827/Archimedes-principle

About the man (interesting fellow): http://global.britannica.com/EBchecked/topic/32808/Archimedes

Mercury: http://www.youtube.com/watch?v=1ie5-Lodpiw

For Extension NASA has some interesting problems to solve: http://www.grc.nasa.gov/WWW/K-12/WindTunnel/Activities/buoy_Archimedes.html

Or practice using this animation: http://www.physics-chemistry-interactive-flash-animation.com/mechanics_forces_gravitation_energy_interactive/buoyancy_Archimedes_principle.htm

__**Additional Websites**__ balanced and unbalanced forces (have a read and then complete the multiple choice questions) []

sky-diving (warning - quite advanced GCSE physics here, for those that want to stretch themselves)

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Forces during a jump - video with the resulting graph - this was taken from the 'logger pro' application! media type="file" key="Forces During Jump.mov" width="300" height="300"

Misconceptions about falling:

http://www.youtube.com/watch?v=_mCC-68LyZM