Transcript slide%20show[1].

Heather Ross
EDU 521
4th grade Science
Electricity, Magnetism and Motion
The following images will be visual
representation on what the students will be
learning in the Science Unit
Table of Contents
•
•
•
•
•
Static Electricity
Electric Current
Magnet
Electromagnet
Motion
– Forces on objects
– Forces in nature
• Simple Machines
– The lever
– Pulley and wheel
– Other simple machines
Static Electricity
www.fotosearch.com/BDX228/bxp40079/
Electric Current
http://www.fotosearch.com/WTD008/08983cs-u
Magnet
Electromagnet
Motion
Motion
Changing Places
Forces on Objects
–
2nd law: "F = ma; acceleration is proportional to force and inversely proportional to the mass of the
accelerated object ." You are pushing a box across a frictionless surface, if you want to speed up the box
faster (increase in acceleration), you push harder (increase in force). If the box was replaced with a heavier.
box (increase in mass), you have to push harder (increase in force) to speed it up at the same rate as before
If you want to calculate the acceleration, first you need to modify the force equation to get a = F/m. When you
plug in the numbers for force (100 N) and mass (50 kg), you find that the acceleration is 2 m/s2
Forces in Nature
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–
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3rd law: "For every action there is a equal and opposite reaction." Perhaps the most misconceived law by
the public, this law does not mean if the earth pulls you down by the virtue of its mass, it also "hold" you up.
This law means the force that is applied has an equal and opposite counterpart. For instance, if you apply a
force to a object, the object applies the same force on you. Therefore, the earth applies a gravitational force
on you, and you apply an equal and opposite force on the earth! This force is not noticed due to the second
law, the earth is approximately 100,000,000,000,000,000,000,000(10^22) times more massive than any of
us but the force is still there.
http://www.nationalgeographic.co.uk/forcesofnature/interactive/index.html?section=v
Simple Machines
.
http://www.beaconlearningcenter.com/weblessons/simplemachines/machines002.htm