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Bernoulli's Principle
Pressure is force per unit area. The unit to measure pressure is a pascal, or N/m^2. The equation for fluid pressure is energy/unit volume. There are two main principles for pressure: Pascal's principle and Bernoulli's principle. Pascal's principle states taht pressure changes applied to the surface of an enclosed fluid are transmitted evenly throughout the fluid. Bernouilli's principle states that as the speed of a moving fluid increases, pressure decreases.
Pascal's Principle
Gravity is the force that keeps all of us on Earth. It causes any two objects in the universe to be attracted to one another. The farther apart matter is from the object that has the gravity, the the less the gravitational force attracts it. Gravity is also the force that keep the planets in orbit. Newton described gravity as a force, while Einstein described it as an indent in space-time. It is a predictable force that acts on all matter in the universe, it even helped create the universe. Gravity is measured by the acceleration of an object. On Earth it is 9.8 m/s/s.
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Friction is the force that holds back the movement of a sliding object. It occurs when object comes into contact. It acts in the opposite direction of which the object is moving. Something that decreases an amount of friction is called a lubricant. This can be a liquid such as water. The amount of friction depends on the surfaces of the two objects. For example, the amount of friction that is present when a cardboard box is sliding on concrete will be different from when a concrete box is sliding on ice. Friction also depends on the weight of the objects. A smaller box is easier to move than a larger box, even if they're both on the same surface.