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Vision: Why we see things

September 1, 2016 By Janice VanCleave

Why do we see different colors? Why does cloth look darker when it is wet? Electromagnetic radiation is light energy. The Sun emits electromagnetic radiation, which contains gamma rays, x-rays, … [Read more...]

Filed Under: color vision, electromagnetic radiation, Physics, vision Tagged With: absorb, blending of light, electromagnetic radiation, Lacey, light energy, Red Spider, reflect, ROY G. BIV, visible light, vision

Newton Studies the Force of Gravity

July 4, 2016 By Janice VanCleave

What is gravity? According to Newton, gravity is the force of attraction between two objects having mass. This means that the two balls in the diagram have a gravitational force of  attraction … [Read more...]

Filed Under: forces and motion, gravity, Physics Tagged With: dimensional analysis, earth's gravity constant, fraction bar, free falling, gravity, Newton, universal gravitation equation, universal gravity constant

Why Boats Float

May 27, 2016 By Janice VanCleave

Buoyancy is the ability of an object to float in a fluid (liquid or gas) An objects floats when in water if the buoyancy force of the water pushing the object up is greater than the force of gravity … [Read more...]

Filed Under: buoyancy, Physics Tagged With: buoyancy, density, displacement, engineering, float, fluid, mass, sink, volume, water displacement

What is Torque?

May 14, 2016 By Janice VanCleave

Torque Objects that rotate experience torque. Objects that rotate turn around some fixed point. When measuring torque, the point of rotation is called the pivot point. Torque is the product … [Read more...]

Filed Under: forces and motion, Physics, torque Tagged With: algebra, merry-go-round, pivot point, see-saw algebra, torque, turning forces

Rotation: Paper Helicopter

May 2, 2016 By Janice VanCleave

Diagram of two red paper twirlers rotating in opposite directions.

Things that rotate turn around a center point. Rotate means to turn around a fixed center point or axis; Two dimensional objects, such as the CD shown, rotate around a stationary center point; … [Read more...]

Filed Under: Physics, rotation Tagged With: axis, CD, clockwise rotation, counterclockwise rotation, earth rotates, forces, helicopter, North Pole, paper helicopter, rotate, rotating top, Science Challenge, South Pole

More About Surface Tension

August 15, 2014 By Janice VanCleave

http://springfieldmn.blogspot.com/2010_06_01_archive.html

How many pennies can you add to a glass filled to overflowing with water?  What is Surface Tension? The photo shows a penny being added to a glass filled to overflowing with water. Notice how … [Read more...]

Filed Under: Featured, forces and motion, Physics, surface tension Tagged With: cohesive force, force, Mary Bowen, matter, physical properties, science standards, surface tension, tension

What is Surface Tension?

July 31, 2014 By Janice VanCleave

Surface Tension is Due to Cohesive Forces A cohesive force is the attractive forces between similar particles. Liquid molecules have a tendency not to separate because of cohesive forces between. … [Read more...]

Filed Under: Featured, forces and motion, Physics, surface tension Tagged With: cohesive force, compression, forces, gravity, net force, surface area, surface tension, surface water molecules, toothpick moves water drop, unbalanced forces, water drops attract each other, water drops on coin

Swimming Noodle Science

March 9, 2014 By Janice VanCleave

Use a swimming noodle to demonstrate that light travels in a straight line until it strikes an object. Hold a flashlight at one end of a swimming noodle. Ask a helper to to point the other end … [Read more...]

Filed Under: Featured, light, Physics Tagged With: infrared light, light energy, swimming noodles, visual light

All About Flying Squirrels

March 14, 2012 By Janice VanCleave

Flying Squirrel

Do flying squirrels really fly? No, flying squirrels volplane! http://www.youtube.com/embed/-D-rsdW4w3s Grammar: Use the word volplane instead of glide. I recommend that you sign-up for … [Read more...]

Filed Under: Physics, volplane-gliding Tagged With: balanced force, engineering, flying squirrel, flying squirrel model, glide, unbalanced force, volplane

Gravity: Newton’s Falling Apple

March 5, 2012 By Janice VanCleave

A projectile has a horizontal velocity and the force of gravity accelerating the objects toward the Earth.

Connecting Gravity with Science History and A Scientist's Contributions. Sir Isaac Newton (1643-1716) a scientist and mathematician wasn't the first person to observe an apple fall from a tree.  … [Read more...]

Filed Under: Featured, gravity, Physics

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