Physics
Published on Nov 28, 2015
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PHYSICS
BEATS
When two sound waves of different frequency approach your ear, the alternating constructive and destructive interference causes the sound to be alternatively soft and loud
Photo by Thomas Hawk
Singing glass
Your finger is doing something similar to the glass, as you slide it around, it will tend to stick, then slip, then stick then slip. Some glasses have a speed at which they will vibrate really really well, if this sticking and slipping is at about the same speed as this the vibration will build up enough that you can start to hear it as the eerie note.
Photo by quinn.anya
Static cling
Static cling is a property of substances that make them cling to each other because of opposite electrical charges. When the conditions are dry and two different kinds of materials come in contact with each other, sometimes there is an exchange of electrons between the two substances. This exchange of electrons leaves one substance with a positive charge and the other with a negative charge. Basic laws of science state that unlike charges attract, thus the two substances will attract one another, which is termed as static cling.
Photo by Meer
Lever launch
The base of the catapult acts as the fulcrum which the catapult arm pivots on. In this case, the force is provided by tension in rubber bands which are attached to the crossbar of the catapult. When the arm is pulled back, the rubber bands tighten, so when the arm is released, the arm propels forward until it his the crossbar. The load acts as the projectile in the bucket. When the arm hits the crossbar, the projectile leaves the bucket and launches forward.
Photo by Thomas Euler
Sunglasses
When light reflects from water, asphalt, or other non-metallic surfaces, it becomes polarized. That is, the reflected light is usually vibrating more in one direction than in others. Polarizing sunglasses reduce this reflection, known as glare, but only when the polarizing lenses are oriented properly.
Photo by Vvillamon
Swinging
They work by using gravity to convert movement energy into potential energy (ie the potential you have to fall!) and back again. The speed of a pendulum doesn’t depend on how heavy it is, only how long it is. So it wouldn’t matter if you or your child were in the swing, you would go at the same speed.
Photo by Stig Nygaard
Terminal velocity
Terminal velocity is achieved, therefore, when the speed of a moving object is no longer increasing or decreasing; the object’s acceleration (or deceleration) is zero. The force of air resistance is approximately proportional to the speed of the falling object, so that air resistance increases for an object that is accelerating, having been dropped from rest until terminal velocity is reached. At terminal velocity, air resistance equals in magnitude the weight of the falling object. Because the two are oppositely directed forces, the total force on the object is zero, and the speed of the object has become constant.
Photo by atzu
Free fall
Free fall is when an object falls solely under the influence of gravity. Because of air resistance, an object can't truly be in a free fall without being in a vacuum
Photo by Program Executive Office Soldier
Water and ice density
We already said ice floats on water because it is less dense, but ice of a special kind can be denser than normal water. "Heavy ice" is denser than normal water because the ice is made from "heavy water". Heavy water, D2O instead of H2O, is water in which both hydrogen atoms have been replaced with deuterium, the isotope of hydrogen containing one proton and one neutron. Heavy water is indeed heavier than normal water (which contains a tiny amount of heavy water molecules naturally), and heavy-water ice will sink in normal water.
Photo by Cayusa
Static electricity
Static electricity builds when electrons leap between two objects that have opposing electrical charges. A stunning handshake occurs when one person has a negative charge, and the other doesn't.
Photo by TaranRampersad
