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The normal force
Conditional Remix & Share Permitted
CC BY-SA
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In this simulation, you see, on the left, a picture of a box at rest on a table. You can apply a vertical force (up or down) to the box. On the right, you can see the full free-body diagram of the box. The free-body diagram shows the gravitational force (green) exerted on the box by the Earth, the normal force (purple) exerted by the table, and the vertical force (dark blue) that you apply. Note that, on the free-body diagram, all three forces are along the vertical line passing through the center of the box, but the force of gravity and the normal force have been shifted a little so they can be seen more easily.

هذه المحاكاة تتحدث عن القوة الطبيعية في الفيزياء

Subject:
Physical Science
Physics
Material Type:
Simulation
Provider:
Boston University
Author:
Andrew Duffy
Date Added:
08/10/2020
pH Scale
Unrestricted Use
CC BY
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Test the pH of things like coffee, spit, and soap to determine whether each is acidic, basic, or neutral. Visualize the relative number of hydroxide ions and hydronium ions in solution. Switch between logarithmic and linear scales. Investigate whether changing the volume or diluting with water affects the pH. Or you can design your own liquid!

Subject:
Applied Science
Biology
Chemistry
Education
Engineering
Life Science
Mathematics
Physical Science
Physics
Material Type:
Activity/Lab
Interactive
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Archie Paulson
Chris Malley
Jack Barbera
Kathy Perkins
Laurie Langdon
Patricia Loeblein
Wendy Adams
Date Added:
07/01/2008