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# How is acceleration measured?

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### Quick Answer

**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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Accelerometers can work in a variety of ways, but the two main types work through piezoelectricity, or capacitance. Piezoelectric material generates an electrical charge when a pressure is applied to it. When a vibration or change in motion (acceleration) occurs, a mass in the accelerometer will apply a pressure to the piezoelectric material proportional to the acceleration; thus, the piezoelectric material will generate an electric charge proportional to the acceleration. Since accelerometers are typically calibrated, the measured output charge can easily be corresponded to an acceleration.

Another way accelerometers can work is through capacitance. According to Wikipedia, capacitance occurs when two conducting materials are separated by a non-conducting material, like air, and the distance between them determines the amount of capacitance that is available. If the two conducting materials move apart due to acceleration, then the capacitance between them changes. By introducing circuitry, it is possible to convert from capacitance to a measurable voltage, which corresponds to an acceleration as with a piezoelectric accelerometer.

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Q:
## What is the formula for deceleration?

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Full Answer >**There is no such thing as a formula for deceleration; there is only a formula for acceleration.**To find the acceleration, subtract the initial velocity from the final velocity and divide that sum by the time taken. If that formula yields a negative answer, it indicates a negative acceleration, or deceleration.Filed Under: -
Q:
## What is the equation for tension in a rope?

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Full Answer >**The equation for tension in a rope is weight plus the product of mass and acceleration.**This can be expressed as T = W + ma.Filed Under: -
Q:
## When velocity is positive and acceleration is zero, what happens to an object's motion?

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Full Answer >**When the acceleration of an object is zero and the velocity is positive, the object continues to move at a steady velocity in the same direction.**The object cannot be changing direction because direction change results in non-zero acceleration.Filed Under: -
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## How much force do you exert when you lift a 50-pound dumbbell?

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Full Answer >**A 50 pound-mass dumbbell is pulled downward by the Earth's gravitational field at an acceleration of 32.174 feet-pound-mass per second squared, so the force to lift it is 1,608.7 pounds-force.**Newton's second law of motion states that force is equal to mass multiplied by acceleration, gravitational or otherwise.Filed Under: