Motion & Mechanics

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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  • How does a water turbine work?

    Q: How does a water turbine work?

    A: Water turbines convert the motion of moving water into rotating mechanical energy by catching the water with large blades. They are important to the structure and function of hydropower plants. There are different models of water turbines, but all perform the same basic function of converting the energy of the moving water into the revolutions of a shaft.
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  • What are the types of acceleration?

    Q: What are the types of acceleration?

    A: There are three types of acceleration in general: absolute acceleration, negative acceleration and acceleration due to change in direction. Acceleration is defined as the rate of change of velocity.
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  • How does an oil jack pump work?

    Q: How does an oil jack pump work?

    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.
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  • Does length affect the period of a pendulum?

    Q: Does length affect the period of a pendulum?

    A: The length of the pendulum is directly correlated to its period as per the pendulum equation: T = 2π√(L/g), where T is the period of the pendulum, L is its length, and g is the gravitational constant 9.8 m/s2. Regardless of the weight of the pendulum bob, otherwise known as the weight at the end of the string, the deciding factor of the period of the swing is length, as it is the only variable in the stated equation.
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  • How does a petrol engine work?

    Q: How does a petrol engine work?

    A: Petrol engines harness the energy created by petrol in the core of a car engine to propel the vehicle. Petrol is a high-energy fuel that releases large amounts of energy when ignited in an internal combustion engine.
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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 is weightlessness?

    Q: What is weightlessness?

    A: Weightlessness, or microgravity, occurs when an object is in free fall, explains the U.S. National Aeronautic and Space Association. Gravity pulls the object in free fall at a faster rate due to the equivalence of the force of gravity to acceleration.
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  • What is gravitational energy?

    Q: What is gravitational energy?

    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.
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  • What is a mechanical governor?

    Q: What is a mechanical governor?

    A: The mechanical governor in an engine uses flyweights and gears in the crankcase to sense the speed to detect changes in the load and increases or decreases the throttle accordingly. According to Briggs and Stratton, a governor is like a car's cruise control system, as it keeps the engine running at the same speed.
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  • What is potential energy?

    Q: What is potential energy?

    A: Potential energy is defined as the energy possessed by a body due to its position or height above the surface of the Earth. Water stored in a dam has potential energy. This potential energy has the capacity to do work.
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  • Why do ships float on water?

    Q: Why do ships float on water?

    A: Ships float because they displace enough water for the buoyancy force to be greater than the force of gravity acting on the ship. The displaced water attempts to return to its original position, now occupied by the ship, which pushes the ship up. This effect is known as buoyancy force. The strength of the force of gravity pulling down on the ship is affected by its weight. Whichever of these forces is stronger determines if the ship floats or sinks.
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  • Why do humans float in water?

    Q: Why do humans float in water?

    A: Any body in water floats or sinks depending on the buoyant forces that push it up and the gravity that pulls it down. If the body is heavier than the water it displaces, it sinks. If the water the body displaces is heavier, then the body floats.
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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 kind of simple machine is a pair of scissors?

    Q: What kind of simple machine is a pair of scissors?

    A: A pair of scissors is two levers put together. With this simple machine, less force is needed because a greater distance is involved. Other types of levers include a see-saw, a hammer, a fork and a baseball bat.
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  • How does sound travel?

    Q: How does sound travel?

    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.
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  • What are radio waves used for?

    Q: What are radio waves used for?

    A: Radio waves are used to receive and transmit signals between two objects. These waves help to transfer signals from broadcasting stations to televisions and radios, and they are also used to transmit signals for cellular phones.
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  • What kind of friction occurs as a fish swims through water?

    Q: What kind of friction occurs as a fish swims through water?

    A: When a fish swims through water, it experiences drag caused by fluid friction. To swim successfully, a fish must use its strength to overcome resistance caused by friction. In clear waters, the water is quite thin, making swimming easier, but in murky waters, fish experience more friction, making swimming difficult.
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  • What is a non-Newtonian fluid?

    Q: What is a non-Newtonian fluid?

    A: Non-Newtonian fluids are those that behave differently than Newtonian fluids do with regard to viscosity. Typically, stress causes non-Newtonian fluids to alter their flow patterns or viscosity. The stress can cause the viscosity to increase or decrease, depending on the particular non-Newtonian fluid.
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  • Which awards were given to Isaac Newton?

    Q: Which awards were given to Isaac Newton?

    A: Sir Isaac Newton was awarded many honors during his life, mostly in the form of titles and positions. In addition to serving as a member, and later president, of The Royal Society, Isaac Newton served as a member of Parliament and professor at Cambridge University. The mathematician and astronomer invented calculus, defined universal laws of motion and gravity, and made discoveries in astronomy and chemistry.
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  • How did Isaac Newton die?

    Q: How did Isaac Newton die?

    A: Newton died in his sleep in London, England, on March 31, 1727, at the age 85. On the previous day, after suffering severe pain in his abdomen, Newton blacked out and never regained consciousness.
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  • How does a petrol pump work?

    Q: How does a petrol pump work?

    A: A petrol pump works by using a diaphragm that pressurizes gasoline, according to Second Chance Garage. The gas transfers from the pump and through fuel line, until it reaches the carburetor.
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