Vertical Projectile Motion Flashcards
Learn definitions, equations , etc for ease of reference
DEFINE IN WORDS AND WITH AN EQUATION
free fall or
a projectile
The motion of a body when only the force of gravity is acting upon it
Friction or air resistance ignored
Fnet = Fg
Time symmetry
The time taken to reach the object’s highest point is the same as the time that it takes to fall from its highest point back down to where it started
Terminal velocity
Definition in words and an equation
It is the constant velocity reached
When air resistance is equal to the gravitational force in magnitude (but opposite in direction.)
Where air resistance prevents further acceleration
F air resistance = F gravitational
this means Fnet = 0 ,
so a =0
so velocity is constant
What is air resistance proportional to?
The velocity of the object
Name 2 factors which affect air resistance:
- Surface area
2. Velocity of object
How does Surface area affect air resistance?
e.g. a webbed suit (Increases SA of skydiver)
This increases air resistance on the diver
decreasing his terminal velocity
thus letting him spend more time in the air
What to look out for in hot air balloon problems
INITIAL VELOCITY
The initial velocity of the object will be the vector sum of the velocity of the balloon and the velocity at which the object is released
Velocity vs time graphs
AREA under =
displacement or distance (in meters)
Velocity vs time graphs
GRADIENT =
acceleration
Displacement vs time graphs
GRADIENT =
velocity
