can u put this vocab. term in ur own words?

Question

thanx..



Terminal Velocity: The constant velocity at which a falling object travels when the size of the upward force of air resistance matches the size of the downward force of gravity.

Answer 1

How about using it in a sentence and discussing it?

If an object is dropped from a great height, so that it will fall for a significant period of time, the force of gravity will accelerate the object downward. But as it accelerates, the air through which it passes will resist its motion (wind resistance) with a force that increases as its downward velocity increases.

Eventually the object will have been accelerated to a velocity at which the force of wind resistance equals the force of gravity. At that point, the net force on the object is 0 (wind resistance offsets gravity), and its acceleration will also be 0 (F = ma, so in this case 0 = m (0)). The velocity at which this occurs is called the "terminal velocity." It could be called the equilibrium velocity, or the ultimate velocity, or any other descriptive name, but we have come to call it "terminal velocity."

Note that terminal velocity is not a fixed number. Obviously, terminal velocity is rather slow in the case of a balloon (and negative in the case of a helium balloon), since its wind resistance is great relative to its mass. And for a dense, streamlined object (think of a steel spear), terminal velocity would be extremely high, perhaps approaching the speed of sound (Mach 1).

Besides the density and shape of the object, other variables that affect terminal velocity include air density and the force of gravity, both of which are significantly reduced at very high altitudes.

Answer 2

The terminal velocity of an object falling towards the earth, in non-vacuum, is the speed at which the gravitational force pulling it downwards is equal and opposite to the atmospheric drag (also called air resistance) pushing it upwards. At this speed, the object ceases to accelerate downwards and falls at constant speed. An object moving downwards at greater than terminal velocity (for example because it previously used power to descend, it fell from a thinner part of the atmosphere or it changed shape) will slow until it reaches terminal velocity.

For example, the terminal velocity of a skydiver in a normal free-fall position with a closed parachute is about 195 km/h (120 mph or 54 m/s). This velocity is the asymptotic limiting value of the acceleration process, since the effective forces on the body more and more closely balance each other as it is approached. In this example, a speed of 50% of terminal velocity is reached after only about 3 seconds, while it takes 8 seconds to reach 90%, 15 seconds to reach 99% and so on.

Answer 3

In vacuum, the increasing velocity of a feather and a bowling ball remain equal until they reach the bottom. In air (still air, no drafts), a feather accelerates for a bit but quickly gets to a speed such that the air resistance is so high it can't increase speed any further. That speed is its terminal velocity. It'll continue at that speed all the way to the ground. The bowling ball also has a terminal velocity but it is much higher than the feather's.

Answer 4

the constant rate at which a falling object travels when forced upwards by air mathces the size of the downward force of gravity

Answer 5

I'd word it as:

The rate at which an object falls, as decreed by the law of gravity, while no air resistance is present.

Answer 6

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