Projectile Motion ?v=-uUsUaPJUc0.
-
Upload
colin-adams -
Category
Documents
-
view
223 -
download
7
Transcript of Projectile Motion ?v=-uUsUaPJUc0.
Projectile Motion
http://www.youtube.com/watch?v
=-uUsUaPJUc0
2
Projectile motion
Vertical motion is affected by gravity –
Horizontal motion is affected by friction –
Vertical component
Horizontal component
it is continually decreasing
which can be negligible
3
Variations in vertical and horizontal components
This causes the observed parabolic flight and affects the motion components as follows:
4
Projectile motion
Factors affecting distance travelled:• • •
Speed of release Height of release Angle of release
Angle of release The optimum angle of release a a
projectile depends upon the relative heights of release and landing
RH = LH optimum angle is 45 deg RH > LH optimum angle is less than 45 deg RH < LH optimum angle is greater then 45
degrees
Examples of these?
Flight Paths Parabolic
Air resistance negligible follows parabolic or symmetrical flight path
Distorted Air resistance is great, projectile veers away
from normal flight path to asymmetrical or distorted flight path
Sporting examples?
7
Impulse
Measured during – force
platforms on track Displayed as
Force x time
sprinting
Force x time graph
8
timeforce
negative
positive• Impulse = force x time
• shown as area under graph
9
Impulse is mainly concerned with
Involves Two parts
single events – a footfall
horizontal forces onlyto a footfall
landing – negative horizontal forces
Push-off – positive horizontal forces
10
Typically
timeforce
neg
pos
Landing - negative impulse
Push-off - positive impulse
Net impulse is difference between positive and negative impulses
11
Typically
timeforce
neg
pos
Small negative impulse
Large positive impulse
Net impulse is positive – performer is accelerating
12
Typically
timeforce
neg
pos
Large negative impulse
Small positive impulse
Net impulse is negative – performer is decelerating