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Levers: First-Class Machines
A lever is a simple machine with a rigid arm that turns about a fixed point called a fulcrum. A first-class lever can ...
Source: John Wiley & Sons, Inc.
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Newton's First Law of Motion: Inertia—the Magician's Friend
Sir Isaac Newton is well known for his three laws of motion. The first law of motion, the law of inertia, states that ...
Source: John Wiley & Sons, Inc.
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Physical Properties of Matter: Tootsie Roll Properties
Matter is anything that has mass and occupies space. Different types of matter are characterized by unique chemical and ...
Source: John Wiley & Sons, Inc.
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Sound Vibrations: Rubber Band Music
Sound is a form of energy that travels in waves. Sound is produced by the vibration of matter. A stringed instrument ...
Source: John Wiley & Sons, Inc.
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Mineral Hardness
Mineral Ranks Minerals can be identified by a variety of characteristics, but one of the most useful ways is to test ...
Source: John Wiley & Sons, Inc.
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Deformation of Rocks: Rocks Under Stress
The Earth's crust and its rigid upper mantle, the lithosphere, are broken into sections or blocks called tectonic ...
Source: John Wiley & Sons, Inc.
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Dominant and Recessive Genes in Cat Breeding
In artificial selection, animal breeders choose the traits they want to appear in the offspring of plants or animals. ...
Source: John Wiley & Sons, Inc.
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Magnetic Rocks: Lodestones
Lodestones are naturally occurring magnetic rocks. These iron-bearing rocks became magnetized by their positions in ...
Source: John Wiley & Sons, Inc.
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Heat Transfer: Spiraling Upward
The Sun warms Earth's surface, but it does so unevenly. Heat is transferred from hot areas to cooler regions. This ...
Source: John Wiley & Sons, Inc.
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Sex-Linked Traits: Flipping Over Color Blindness
The sex chromosomes of a female are XX, and those of a male are XY. Traits controlled by genes located on the sex ...
Source: John Wiley & Sons, Inc.
Additional Content
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1.
Fossil Molds and Casts: Making Fossils
Fossils are the remains or impressions of once-living plants and animals. The best impressions are made from the hard...
Source: John Wiley & Sons, Inc. -
2.
Astrolabe: Medieval Measurements
In ancient times astronomers used a very simple tool to measure the height of a star in the sky. This instrument, the...
Source: John Wiley & Sons, Inc. -
3.
Gene Splicing: Human Growth Hormone and Recombinant DNA
Today's scientists can insert genes of one organism into the DNA of another organism. This technique, gene splicing, is...
Source: John Wiley & Sons, Inc. -
4.
Tendons: Visualizing How the Fingers Work
Skeletal muscles are responsible for the movement of bones. As a muscle contracts, it pulls on the bone to produce...
Source: John Wiley & Sons, Inc. -
5.
Boyle's Gas Law: Marshmallow Under Pressure
Boyle's Law states that when temperature is held constant, the volume—the amount of space occupied by matter—of a...
Source: John Wiley & Sons, Inc.
