30 terms

# Chapter 3: Projectile Motion

###### PLAY
vector quantity
requires magnitude and direction (velocity and acceleration)
scalar quantity
requires magnitude only (mass/speed)
Vector
pictorial presentation of a vector quantity
length of arrow
shows magnitude
direction of arrow
shows direction
hurts you
tailwind
helps you
crosswind/ current
helps you (assume perpendicular)
parallelogram
4 sides opposite angles are parallel and congruent
√2 =
1.414
2 components are at right angles with the same magnituedes
use √2 rule
R=
√2 x side
side=
R/√2
projectile
any object that moves through the air or through space, acted on only by gravity
vertical component
responsible for hang time (gravity
horizontal component
only responsible for range (air resistance
horizontal and vertical
are independent of each other
Fig 3.9
falling at same rate both affected by gravity
resultant
shows magnitude and direction of projectile
resultant
vector sum of two or more component vectors
resolution
the process of resolving a vector into components
Fig 3.11
at peak v is 0 and h becomes resultant and never goes slower that that
fig 3.13
same speed at every attempt , different ranges
earth
curves away @ 5m
minimum speed km/s, 8000
8 km/s, 8000 m/s, 18000 mi/h (burn up)
with satellite have to go
over 150km above earth or it will burn up
how high
d=1/2gt(squared) (vertical)
how fast
sp= d/t (range)
how far
d=spxt (range)
how long
t=d/sp (range or t=√2d/g(vertical)