This simulation shows the difference between Constant Velocity vs. Constant Acceleration هذه المحاكاة تبين الفرق بين السرعه الثابته والتسارع المستمر في الفيزياء
- Author:
- Andrew Duffy
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The simulation shows five different motions in which objects experience constant acceleration, starting from rest. Although each motion is different, the underlying physics is the same. What features of the simulation reinforce the idea that the physics is the same?
- Author:
- Andrew Duffy
In this activity, learners make their own heat waves in an aquarium. Warmer water rising through cooler water creates turbulence effects that bend light, allowing you to project swirling shadows onto a screen. Use this demonstration to show convection currents in water as well as light refraction in a simple, visually appealing way.
- Author:
- The Exploratorium
- California Department of Education
- NEC Foundation of America
- National Science Foundation
Students learn about using renewable energy from the Sun for heating and cooking as they build and compare the performance of four solar cooker designs. They explore the concepts of insulation, reflection, absorption, conduction and convection.
- Author:
- Malinda Schaefer Zarske
- Integrated Teaching and Learning Program,
- Geoffrey Hill
- Jessica Butterfield
- Sabre Duren
- Jessica Todd
- Jeff Lyng
- Denise Carlson
- Xochitl Zamora-Thompson
Does an ice cube melt more quickly in salt water or in freshwater? The answer surprises the group of student science teachers portrayed in this case study. To explain the phenomenon they must figure out the interactions between two clusters of concepts: (1) density and its relationship to floating or sinking, and (2) three modes of heat or energy transfer due to a temperature difference (particularly conduction and convection, with an optional discussion of radiation). The case can be adapted for use in general education science courses or for introductory physics or chemistry courses.
- Author:
- Li-hsuan Yang
Conditional Remix & Share Permitted
CC BY-NC-SA
Thermal backgrounds in space. Cosmological principle and its consequences: Newtonian cosmology and types of "universes"; survey of relativistic cosmology; horizons. Overview of evolution in cosmology; radiation and element synthesis; physical models of the "early stages." Formation of large-scale structure to variability of physical laws. First and last states. Some knowledge of relativity expected. 8.962 recommended though not required. This course provides an overview of astrophysical cosmology with emphasis on the Cosmic Microwave Background (CMB) radiation, galaxies and related phenomena at high redshift, and cosmic structure formation. Additional topics include cosmic inflation, nucleosynthesis and baryosynthesis, quasar (QSO) absorption lines, and gamma-ray bursts. Some background in general relativity is assumed.
- Subject:
- Astronomy
- Physical Science
- Physics
- Material Type:
- Full Course
- Textbook
- Author:
- Bertschinger, Edmund
- Date Added:
- 01/01/2001
This 10-minute video lesson provides a basic introduction to light and electromagnetic radiation. [Cosmology and Astronomy playlist: Lesson 68 of 85]
- Author:
- Khan, Salman
This 12-minute video lesson clarifies the effect of axial precession on the calendar and the date of perihelion and aphelion. [Cosmology and Astronomy playlist: Lesson 73 of 85]
- Author:
- Khan, Salman
The students discover the basics of heat transfer in this activity by constructing a constant pressure calorimeter to determine the heat of solution of potassium chloride in water. They first predict the amount of heat consumed by the reaction using analytical techniques. Then they calculate the specific heat of water using tabulated data, and use this information to predict the temperature change. Next, the students will design and build a calorimeter and then determine its specific heat. After determining the predicted heat lost to the device, students will test the heat of solution. The heat given off by the reaction can be calculated from the change in temperature of the water using an equation of heat transfer. They will compare this with the value they predicted with their calculations, and then finish by discussing the error and its sources, and identifying how to improve their design to minimize these errors.
- Author:
- Janet Yowell
- Integrated Teaching and Learning Program,
- Malinda Zarske
- James Prager
- Megan Schroeder
Students learn about the physical force of linear momentum movement in a straight line by investigating collisions. They learn an equation that engineers use to describe momentum. Students also investigate the psychological phenomenon of momentum; they see how the "big mo" of the bandwagon effect contributes to the development of fads and manias, and how modern technology and mass media accelerate and intensify the effect.
- Author:
- Ben Heavner
- Malinda Schaefer Zarske
- Integrated Teaching and Learning Program,
- Denise Carlson
- Chris Yakacki
In this activity, students construct their own pinhole camera to observe the behavior of light.
- Author:
- Janet Yowell
- Integrated Teaching and Learning Program,
- Frank Burkholder
- Alison Pienciak
- Luke Simmons
- Abigail Watrous
This activity gives a visual representation of how we are able to observe many colors in a sunrise or sunset.
- Author:
- Sherrie Seidensticker, Jeffers Pond Elementary, Prior Lake Minnesota, adapted from the web page scifun.chem.wis.edu/HomeExpts/BlueSky.html
- Seidensticker, Sherrie
Student teams investigate the properties of electromagnets. They create their own small electromagnet and experiment with ways to change its strength to pick up more paper clips. Students learn about ways that engineers use electromagnets in everyday applications.
- Author:
- Abigail Watrous
- Malinda Schaefer Zarske
- Integrated Teaching and Learning Program,
- Xochitl Zamora Thompson
- Denise Carlson
- Joe Friedrichsen
Students perform DNA forensics using food coloring to enhance their understanding of DNA fingerprinting, restriction enzymes, genotyping and DNA gel electrophoresis. They place small drops of different food coloring ("water-based paint") on strips of filter paper and then place one paper strip end in water. As water travels along the paper strips, students observe the pigments that compose the paint decompose into their color components. This is an example of the chromatography concept applied to DNA forensics, with the pigments in the paint that define the color being analogous to DNA fragments of different lengths.
- Author:
- TeachEngineering.org
- Mircea Ionescu
- Myla Van Duyn
- National Science Foundation GK-12 and Research Experience for Teachers (RET) Programs,
This activity is an entire-class lab experiment that refreshes the concepts of sinking and floating, while introducing the concepts of bouyancy and density using the fizz from sprite (carbon dioxide gas) and raisins.
- Author:
- Kami Miller Oak Crest Elementary Belle Plaine, MN
- Miller, Kami
In this first part of a two-part lab activity, students use triple balance beams and graduated cylinders to take measurements and calculate the densities of several common, irregularly shaped objects with the purpose to resolve confusion about mass and density. After this activity, conduct the associated Density Column Lab - Part 2 activity before presenting the associated Density & Miscibility lesson for discussion about concepts that explain what students have observed.
- Author:
- TeachEngineering.org
- GK-12 Program,
- Jessica Ray, Phyllis Balcerzak, Barry Williams
Concluding a two-part lab activity, students use triple balance beams and graduated cylinders to take measurements and calculate densities of several household liquids and compare them to the densities of irregularly shaped objects (as determined in Part 1). Then they create density columns with the three liquids and four solid items to test their calculations and predictions of the different densities. Once their density columns are complete, students determine the effect of adding detergent to the columns. After this activity, present the associated Density & Miscibility lesson for a discussion about why the column layers do not mix.
- Author:
- TeachEngineering.org
- GK-12 Program,
- Jessica Ray, Phyllis Balcerzak, Barry Williams
In this lab activity, students determine density differences of water samples with varying temperature and salinity levels. Students synthesize information to predict the effects of oil in given water samples.
- Author:
- Mary Holmberg
A lab where the students study the density of pennies. They will discover the limitations of measurements and the value of multiple trials.
- Author:
- Robert Ward
This activity is a demonstration proving that carbon dioxide is more dense than air which leads to a deeper understanding of the term density.
- Author:
- Hans Albrecht
- Hans Albrecht