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![]() If you recall high school physics you will remember the difference between potential and kinetic energy. It measures how much distance the object moves in a certain amount of time.As others have mentioned, as a fluid moves faster it's pressure decreases. Velocity can also be described as the speed an object moves in a specific direction. Velocity – The rate of change in an object’s position. A plane uses engines to thrust it forward to gain enough speed that allows the air pressure to lift it into the air! Thrust – A pushing force that accelerates an object in the opposite direction to drag. Momentum can be found by multiplying the velocity of an object by its mass (or, how much matter is inside of the object). When an object is moving, it has momentum. The air pressure moving underneath the wing of an airplane is the lift that allows it to stay in the air. Lift – The force that pushes “up”, directly opposing the force of Earth’s gravity and an essential component when discussing flying objects. ![]() Gravity is why we are pulled down to the ground (also known as the planet Earth)! The closer two, or more objects are to each other the more stronger the pull of their gravity. The larger the mass of an object the more gravity it has. Gravity – An invisible force that pulls objects toward each other. A force can cause an object to accelerate, slow down, remain in place, or change shape. Drag is also known as wind, or air resistance!įorce – Simply put, a push, or a pull on an object. The force of drag moves in the opposite direction to the motion of the object and increases the faster the object moves. Faster moving air will create lower pressure and slower moving air will create higher pressure systems.ĭrag – A force produced by air that slows an object down as it moves through the air. The atmosphere is what plants and animals (like humans!) need to breathe to survive.īernoulli Effect – The theory that says that when air moves around an object it will create different amounts of pressure on the object. Air pressure is the highest at sea level where the molecules are pushed the closest together!Ītmosphere – The layer of gases surrounding the Earth kept in place by the force of gravity. Moving air can create differences in pressure from lower to higher pressure systems. Air does have weight, takes up space, and can be contained within objects!Īir Pressure – The weight of air molecules pressing down on the Earth. Eventually this force will bring our gliders down to land.Īir – The collection of small molecules and atoms made of different gases that makes up Earth’s atmosphere. And we can’t forget about the force of gravity that is always working on objects close to the Earth and pulling them down. With these gliders, we’ll capture the slower moving air (a higher pressure system) in the hoops, providing the force of lift that will keep the glider in the air. We will use thinner, lighter materials in the construction of the glider to reduce this pushing force, and a larger loop on the back of the glider to use the force of drag to keep the glider upright! The Bernoulli Principle tells us that when faster moving air moves against an object it creates higher pressure systems and lower pressure systems. At the same time, the force of drag pushes against the glider in the opposite direction. ![]() For this activity, your hand and arm will provide the thrust that push your glider forward. Those forces are thrust, drag, lift, and gravity. Hoop Gliders move through the air using the same forces that larger airplanes use when they fly. Would you like to make your own flying toy, but you’re tired of paper airplanes? Try making a hoop glider, instead! ![]()
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