What is a Second?
In science, a "second" is a unit of measurement for time. It is used to measure the duration of events or the intervals between them.
Study Guide
- Definition: A second is a unit of time that is equal to 1/60th of a minute or 1/3,600th of an hour.
- Symbol: The symbol for second is "s".
- Measuring Time: A second is a very short amount of time. It is often used to measure quick events, such as the ticking of a clock or the time it takes for a ball to roll across the floor.
- Timing Events: We use seconds to time how long it takes to do something, like running a race or boiling an egg.
- Subdivisions: Just like an hour has 60 minutes and a minute has 60 seconds, a second can be divided into smaller units of time, such as milliseconds (1/1,000th of a second) and microseconds (1/1,000,000th of a second).
◂Science Worksheets and Study Guides First Grade. Magnets
Study Guide
Magnets 
Worksheet/Answer key
Magnets Worksheet/Answer key
Magnets Worksheet/Answer key
Magnets Vocabulary/Answer key
Magnets
Worksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
PHYSICAL SCIENCE (NGSS)
Waves and their Applications in Technologies for Information Transfer
Students who demonstrate understanding can:
Plan and conduct investigations to provide evidence that vibrating materials can make sound and that sound can make materials vibrate.
Use tools and materials to design and build a device that uses light or sound to solve the problem of communicating over a distance.