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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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Counting Molecules and Atoms: Number of Molecules of Chalk in Your Signature
Chemists often work with large numbers of small particles. To make counting easier, they use a unit called a mole. One ...
Source: John Wiley & Sons, Inc.
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Double Replacement Reactions: Trading Partners
There are many situations in life where items are traded or exchanged. Trades also occur in chemical reactions. In ...
Source: John Wiley & Sons, Inc.
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Closed Circuits: A Battery, a Bulb, and a Paper Clip
An electrical circuit is a closed loop that has a power source, wires to conduct current, and a load. The load is ...
Source: John Wiley & Sons, Inc.
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Identifying and Naming Isotopes: ''EggCeptional'' Isotopes
The nucleus (central core) of an atom consists of protons (positively charged particles) and neutrons (particles that ...
Source: John Wiley & Sons, Inc.
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Surface Area and Solubility: Sweet Solutions
The dissolving medium in a solution is called a solvent, and the substance being dissolved is called the solute. ...
Source: John Wiley & Sons, Inc.
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Magnetizing Metals: The Magnetic Nail
In magnets, the electrons of atoms are lined up so that they are all spinning in the same direction. This group of ...
Source: John Wiley & Sons, Inc.
Additional Content
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1.
Chemical and Physical Changes: Examining Paper for Change
Substances can undergo changes that do not always involve chemical reactions. When ice melts and changes to water, the...
Source: John Wiley & Sons, Inc. -
2.
Law of Conservation of Momentum: Marble Collisions
If you have ever played pool or marbles, you have probably noticed that when a moving ball strikes a resting ball, the...
Source: John Wiley & Sons, Inc. -
3.
Proteins As Enzymes: Saltine Crackers and Amylase
A protein is a large molecule found in cells. The unique structure of a protein determines its function. Enzymes are...
Source: John Wiley & Sons, Inc. -
4.
Arthropod Behavior: Response of the Pill Bugs
Pill bugs are members of the Arthropod phylum. All arthropods are invertebrates with jointed appendages and hard...
Source: John Wiley & Sons, Inc. -
5.
Physical Weathering Of Rocks: Sugar Cube Breakdown
The rocks that compose the Earth's crust are subjected to a variety of forces. Depending on the environmental factors at...
Source: John Wiley & Sons, Inc.
