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# What is the velocity ratio?

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Velocity ratio is the comparison between the amount of force an object creates and the force around it that acts against the object. Velocity ratio is calculated by dividing the force working against the object with the force exerted by the object.

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Velocity ratio is also defined as the ratio of a distance through which any part of a machine moves, to that which the driving part moves during the same time. An object has a mechanical advantage if it exerts a force higher than the velocity ratio. This happens because the object’s force is enough to trade off the force against it. When driving a car, for example, the force of gravity and friction are against the car’s motion.

## Related Questions

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An object does not have a varying speed if its velocity is constant. A constant velocity implies that an object is moving in a straight line at an identical rate over time.

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In projectile motion, horizontal velocity is the rate at which an object is traveling parallel to the earth. Scientists calculate horizontal velocity using the formula v = d/t, the same formula used to determine the speed of an automobile. In projectile motion, horizontal velocity does not change; however, the forces of gravity give the object vertical acceleration, causing it to stop when it hits the ground.

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Terminal velocity is the velocity at which an object in freefall no longer accelerates due to gravity because the drag force of the surrounding air equals the gravitational force of Earth. Objects with more mass have more weight, and it takes more drag force to reach terminal velocity.