The upward force acting upon a falling object is called air resistance, according to Georgia State University. Often referred to as drag in aerodynamics, air resistance works in the opposite direction from which an object is moving.
A:Laminar and turbulent flows are the two major forms of fluid flow, with laminar flow being an orderly flow with all the fluid molecules moving parallel in the direction of flow, whereas in turbulent flow, different streams of fluid form eddies and unpredictable currents in a different direction than the overall direction of flow. Which type of flow arises in a fluid depends on its speed relative to its viscosity and the size and shape of the pipe or other channel carrying the fluid. Viscosity is the resistance to flow, and more inherently viscous fluids are more resistant to turbulence.
A:A stapler is an example of a second class lever. Levers are designated as second class if the load is situated between the fulcrum, or pivoting point, and the point where effort, or force, is applied.
A:Gravitational energy is the movement of an object or mass that is caused by the pull of gravity. This is caused on Earth by the strong attraction of all other masses to be drawn back to Earth's center. An example of gravitational energy is water from a river tumbling over a cliff to form a waterfall.
A:An oil jack pump works through a series of gears and a motor that lower a plunger into a certain depth and allow it to fill up with pumped fluid. The plunger is then closed off and raised with the same mechanics that lowered it so that the fluids that are inside the well cannot leave, according to the Massachusetts Institute of Technology.
A:Streamlining reduces air resistance by providing a smooth surface over which air flows easily and uniformly. Without streamlining, eddies formed on the trailing edges of objects create turbulent, low-pressure areas and increase air resistance, also known as drag.
A:"Swept volume" is defined as the volume of fluid through which a piston or plunger moves when it makes a stroke in an engine, according to Oxford Dictionaries. The swept volume times the number of cylinders in an engine is known as the displacement, usually measured in liters. Calculating the swept volume is done by multiplying pi times the radius squared times the height of the chamber.
A:Mass does not affect speed directly, but it does affect how fast an object can change its speed by accelerating or decelerating. Objects with larger masses require more time for acceleration or deceleration compared to lighter objects.
A:The law of the pendulum, discovered by Galileo Galilei, states that swinging objects follow the same path and have a period between swings that remains constant. Galileo attracted immediate attention for the discovery, which was later used in clock regulation.
A:Some of Sir Isaac Newton's achievements include defining the law of gravity and the three laws of motion, inventing the reflecting telescope, defining theories of light and color and inventing calculus. Newton was a philosopher, mathematician and physicist who played an important role in the scientific Revolution of the 17th century.
A:Sir Isaac Newton discovered gravity around 1665 while he was drinking tea and observed an apple falling from a tree. Newton deduced that the force that caused the apple to fall to the ground also is the same force that causes the moon to orbit the earth.
A:In physics, simple harmonic motion refers to repetitive oscillation back and forth through a central or equilibrium position. A pendulum is a good example of a physical system that exhibits simple harmonic motion. The time taken to complete one full oscillation is called a time period.
A:Sound travels in waves from a transmitter to a receiver through a medium. The wave is produced by the vibration of particles in mediums such as gases, liquids and solids. Because sound requires a medium of interconnected and interactive particles, it cannot travel in a vacuum such as space.
A:Acceleration is any change in the speed or the direction of movement. It does not matter, from a scientific point of view, if only the direction changes but not the speed, as with a planet in a circular orbit, or if the object is reducing in speed but keeping the same direction. Acceleration, like velocity, is a vector quantity, so it can only occur in one direction.
A:A pulley works by changing the direction that force must be applied to lift an object against gravity. Other, more complex, systems use multiple pulleys to reduce the amount of force that must be applied.
A:Riding a bike is an example of Newton's third law of motion because the force needed to pedal a bike forward, which is the force that the tire exerts on the ground, is equal to the force of the ground pushing against the tire. The real-world example of riding a bike can also be used to demonstrate Newton's first and second laws of motion.
A:Convection works by transferring heat from a hot substance to a cooler one through the motion of one of the substances. For example, as wind passes over a hot substance, heat from the substance transfers to the air particles, cooling the hot substance and slightly warming the air.