Terminal Velocity & Drag.

Revision notes for physics 2 on terminal velocity and drag.

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TERMINALVELOCITY
THE TOP SPEED REACHED BY AN OBJECT BEFORE AIR RESISTANCE STOPS IT.
BALANCED CONSTANT SPEED.
Resistancewilldecreasetheacceleratingforceuntilt hetwoforcesare
equal­t hisist het erminalvelocity.
On Earth, air resistance causes things to fall at different rates. It is
affected by drag and weight. For example, a skydiver without his
parachute open will have weight acting downwards and air
resistance pushing upwards ­ he'd reach a terminal velocity of
about 120mph. However, with his parachute up, he'd have a larger
surface area hence a higher air resistance so his terminal velocity
will fall down to about 15mph.
So...
i. The force acting down is weight (mass x
gravity)
ii. The force acting up is air resistance.
iii. On the moon there is no air so the only
force acting upon a falling object is gravity so
objects, no matter what size, will fall at the same
speed.
iv. An increased surface area will increase air resistance.
v. The higher the air resistance, the lower the terminal velocity.
vi. All objects will fall at the same speed if air/water resistance can't
act upon it.
DRAG
YOU GET DRAG WHEN AN OBJECT PASSES THROUGH A FLUID (LIQUID OR AIR).
This is a type of resistance, like friction. Reducing drag would increase speed, for example,
cars are streamlined to increase their speed. However, a parachute does the opposite of

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The drag would
increase as speed increases.…read more

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