ap physics unit 1 part 3 - free fall and projectile motion

an object is said to be in vertical free fall when the only force acting on it is the _________ _____.

an object is said to be in vertical free fall when the only force acting on it is the _________ _____.

gravitational force

for rising objects, the speed __________ at a rate of _______ m/s_²

decreases; 9.8 or 10 m/s²

V_o when the object is first launched

=/= 0

time if the object starts and ends at the same height

t_up = t_down = ½t_total

V at any particular height

V_up = -V_down

relationship btwn acceleration & gravity at all points along the path (coming up, going down, and at the top)

a = -g

projectile motion occurs when

an object is launched horizontally or at an angle above/below the horizontal

if an object is launched w/ V_o @ angle theta above the horizon, the x component of the V is given by:

if an object is launched w/ V_o @ angle theta above the horizon, the y component of the V is given by:

the acceleration in the x direction is always ___ so the x-velocity ______ _________

0; stays constant

the acceleration in the x direction is always _____ so the y-velocity __________ ___ __ _________ ____

-g; decreases at a constant rate

the only variable common between the x and y motion is:

time (t)

for horizontal motion, only this equation can be used

for vertical motion, only these equations can be used

any of the kinematics equations

in projectile motion w/ no air resistance, the max range occurs when the launch angle is

45°

any 2 angles that add up to ____° will have the same range

90°