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i am really strugaling whith projectiles can someone help
what about projectiles?
based on the fact that I can't really guess on what topic of projectiles you are reffering to so...
I found this website which might help :D
this is apparently AS so have a look and see what you understand:
Some tips when doing projectiles:
+ Remember the horizontal and vertical motion are independent (do not use a vertical value when you are calculating horizontal values).
+ Remember the projectile decelerates until it reaches the top of it's trajectory (journey) and then it starts to accelerate downwards.
+ The projectile will follow a parabolic path.
+ The acceleration/deceleration will be the acceleration due to gravity.
+ The range is the horizontal distance and the maximum height is the vertical distance.
+ When you work out time using v = u + at or something like that, you have only worked out the time it takes the projectile to reach the top of it's trajectory - so multiply your answer by 2.
+ when calculating max height, you are looking at the first half of the journey only, so use half time.
+ when calculating range do not use acceleration because a projectile does not accelerate horizontally.
+ Remember that if a projectile is moving from say a table to the ground then it is like a half journey (half parabola) so you do not need to multiply time by 2.
+ Remember that air resistance can be ignored, so just put that to the back of your mind.
+ Remember the angle when working out horizontal and vertical components of initial velocity. IF the angle is to the horizontal then vcosx is the horizontal component (v = velocity, x = angle) and the vertical component is vsinx.
+ If you need to work out the initial velocity after having been given the horizontal and vertical components, use pythagoras.
+ If you need to work out the angle use trigonometry (SOHCAHTOA)
I hope this helps and has not confused you more : )
BTW do not do what I did in my mock and confuse horizontal and vertical components of motion - such a stupid mistake to make.
Search for my newly made revision cards:
Projectiles: What to do and what not to do
It should help you!!!
Modified once, last modified by Former Member on Fri 7th December, 2012 @ 20:55