: Newton's Second Law
of Motion The acceleration of a mass is directly proportional
to the force and inversely proportional to the mass F= ma
Sir Issac Newton was an English mathematician and physicist
who laid the foundations for modern physics. Newton used Keplers laws and
his own observations to derive the universal law of gravitation. A popular
story Newton was sitting under an apple tree, an apple fell on his head,
and he suddenly thought of the Universla Law of Gravitation. As in most
legends, this story contains elemets ow what actually happened. To learn
more click on this URL-http://csep10.phys.utk.edu/astr161/lect/history/newtongrav.html
Detailed page explaining Newton's Universal Law of Gravitation.
In
a previous unit, it was stated that all objects (regardless
of their mass) free-fall(http://www.glenbrook.kiz.il.us/gbssci/phys/Class/1Dkin/U1Lse.html
) with the same acceleration - 10 m/s/s. This particular acceleration value
is so important in physics that it has its own peculiar name - the acceleration
of gravity fttp://www.glenbrook.K12.il.us/gbssci/phys/Class/1Din/U1L5b.htmland
its own peculiar symbol - "g." But why do all objects free-fall at the
same rate of acceleration regardless of their mass? Is it because they
all weigh the same? ... because they all have the same gravity?
... because the air resistance is the same for each? Why? This question
will be explored in this section of Lesson 3.
In addition to an exploration of free-fall, the motion of objects which encounter air resistance will also be analyzed. In particular, two questions will be explored:
| 1-D Kinematics,Newton's Law, Work, Energy, and Power
http://www.physicsclassroom.com |
Coolarchive http://www.Discoveryschool.com | |
| Electricty, Magnetism, energy an fusion
http://ippex.pppl.gov |
Momentum and Its Conservation
http://www.physicsclassroom.com |
|
| http://particleadventure.org | Circular Motion and Ssatellity
Motion
http://www.physicsclassroom.com |
|
| Virtual physics
http://www.virtualprof.com |
Nasa Kids
http://www.Nasa.gov |
|
| Gravity
http://csep10.phys.utk.edu/astr161/lect/history/newtongrav.html |
Nature games
http://www.eNature.com |
Light Waves and Color
The behavior of light waves is introduced and discussed: through
supporting evidence of the wave nature of light.
| Light Waves and Color
http://www.physicsclassroom.com |
Bang Boing Pop
http://tqd.advanced.org |
| Think Quest Internet Contest
http://thinkquest.org |
Newton's Laws:http://mcasco.com/plnlm.html |
The visible light spectrum is shown in the diagram below.
Click on physicclassroom and follow directions to Light Waves and Color.
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