Motion & Mechanics

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The law of acceleration is formally referred to as Newton's Second Law of Motion and defines the rate of acceleration as a product of the force exerted on the object and the mass of the object. The rate of acceleration increases as the net force increases. The inverse is true for mass, with the acceleration decreasing as the mass increases.

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  • Why do some objects float in water and others sink?

    Q: Why do some objects float in water and others sink?

    A: Objects comprised of material that is denser than water tend to sink; objects with a lighter density tend to float. Since air is lighter than water, hollow objects can float if their total density is less than water. Preventing objects from absorbing water is important.
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  • What is the law of acceleration?

    Q: What is the law of acceleration?

    A: The law of acceleration is formally referred to as Newton's Second Law of Motion and defines the rate of acceleration as a product of the force exerted on the object and the mass of the object. The rate of acceleration increases as the net force increases. The inverse is true for mass, with the acceleration decreasing as the mass increases.
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  • Why is rolling friction much less forceful than sliding friction?

    Q: Why is rolling friction much less forceful than sliding friction?

    A: When an object slides across the ground, it has much more surface area in direct contact with the ground, which means that the amount of friction is significantly higher. When an object rolls along the ground, only a minuscule point on the object contacts the ground at any point in time, making the stopping force much weaker.
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  • What is an example of kinetic energy?

    Q: What is an example of kinetic energy?

    A: Because any moving thing or object has kinetic energy, there are many examples of this energy type, including a ball dropping into water, a car in motion and a moving arrow. However, there are different types or forms of kinetic energy.
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  • What is the difference between absolute and relative location?

    Q: What is the difference between absolute and relative location?

    A: Absolute location is a place's exact spot on a map, while relative location is an estimate of where a place is in relation to other landmarks. Absolute location is defined by latitude and longitude measurements. Relative location is used in conversational language and for giving rough directions.
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  • How is acceleration measured?

    Q: How is acceleration measured?

    A: Acceleration is measured by using an accelerometer, an electromechanical device that measures acceleration forces. Dimension Engineering explains that these forces can be static, such as those caused by gravity, or dynamic, as in those that cause motion.
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  • What does "E=mc2" mean?

    Q: What does "E=mc2" mean?

    A: Albert Einstein's formula "E=mc2" means energy equals the mass of an object multiplied by the speed of light squared. His theory means that the mass of an object, no matter how small, can be transformed into a tremendous amount of energy.
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  • What are pulleys used for?

    Q: What are pulleys used for?

    A: A pulley is a simple tool that can be used for many things, such as lifting heavy objects or to change the direction of applied forces for various means. A pulley is a very simple tool that consists of a wheel on a fixed axle that has grooves for keeping a rope or wire in place. This makes pulleys useful for lifting heavy objects using applied human force.
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  • What is the definition of input force?

    Q: What is the definition of input force?

    A: Input force is the initial force used to get a machine to begin working. Machines are designed to increase the input force for a larger output force.
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  • How much pressure can an egg withstand?

    Q: How much pressure can an egg withstand?

    A: An experiment conducted at the Science Studio at Imagination Station demonstrated that a single egg was able to withstand at least 3.75 pounds of force. Eggs are most resistant to breaking when pressure is applied to their ends.
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  • What is an example of the application of Archimedes' principle in daily life?

    Q: What is an example of the application of Archimedes' principle in daily life?

    A: Every time a person takes a bath, Archimedes' principle is observed as the tub is filled to a certain level and, once the bather enters the water, it rises based on the volume of water weight that the person's body displaces. Adding chicken to a pot of boiling water yields the same results but on a smaller scale.
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  • What is kinetic friction?

    Q: What is kinetic friction?

    A: Kinetic friction refers to the frictional force of a moving object. If a force is being applied on a stationary object, friction is considered a static force until movement occurs.
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  • What is a Venturi meter?

    Q: What is a Venturi meter?

    A: A Venturi meter is a flow measurement device, commonly utilized in the water supply industry. A Venturi meter specifically uses a converging section of pipe to increase flow velocity. A corresponding reduction in pressure permits a determination of the flow rate.
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  • How do bullet trains work?

    Q: How do bullet trains work?

    A: Bullet trains, also called maglev trains, operate with magnetic levitation technology developed by Japanese and German engineers. Japanese engineers refer to their method as electrodynamic suspension while German engineers refer to their method as electromagnetic suspension. Either way, magnets raise the trains above the track, which means there is no need for wheels.
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  • What is the Bernoulli Principle?

    Q: What is the Bernoulli Principle?

    A: The Bernoulli Principle is the concept that claims that as the velocity of a fluid increases, its pressure decreases. Daniel Bernoulli was an 18th century scientist who discovered this principle.
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  • What are the main branches of mechanics?

    Q: What are the main branches of mechanics?

    A: The two main branches of mechanics are statics and dynamics. Static mechanics is the study of forces which are required to keep a body in equilibrium. Dynamics is the study of motion itself, and the forces producing it.
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  • How does convection work?

    Q: How does convection work?

    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.
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  • What is water displacement?

    Q: What is water displacement?

    A: Water displacement is a particular case of fluid displacement, which is simply the principle that any object placed in a fluid causes that fluid to no longer occupy that volume of space. The fluid must go somewhere, however, and so with liquids in containers, this causes their overall height to rise. Gases are also fluids subject to displacement, and they both fill space and are compressible, so an object introduced to a sealed container full of a gas simply decreases the volume of the gas and increases its pressure.
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  • What is the law of the pendulum?

    Q: What is the law of the pendulum?

    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.
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  • What are complex machines?

    Q: What are complex machines?

    A: A complex machine is a combination of two or more simple machines. A simple machine is one of the six basic devices that make work easier by changing the degree or direction of a force.
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  • What is the definition of internal force?

    Q: What is the definition of internal force?

    A: By definition, internal force is whatever causes an object with mass to accelerate or move. This force is equal to the product of the mass of the object plus its rate of acceleration.
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