LECTURE #8 - projectile motion (2)

Question 1

define projectile :

Answer 1

object in free-fall that is affected only by gravity and air resistance

Question 2

define trajectory :

Answer 2

flight path of a projectile

Question 3

define release :

Answer 3

when object becomes a projectile

Question 4

define apex :

Answer 4

highest point of trajectory

Question 5

is projectile velocity most or least important ?

Answer 5

most important

Question 6

an increase in v(x) = _____ for horizontal displacement (range)

Answer 6

increase in horizontal displacement (range)

Question 7

an increase in v(y) = ______ for time up & time down = _____ total flight time

Answer 7

increase in time up & increase time down = increase total flight time

Question 8

describe projectile height :

Answer 8

• increase total flight time
• increase total flight time = increase horizontal displacement (range)
• v(x) and v(y) remain the same

Question 9

describe angle :

Answer 9

• affects ration of v(x) & v(y)
• minimal effect since increase in one are offset by decrease in the other

Question 10

for the variable “fight time” what are the factors of influence ?

Answer 10

v(y) initial & projectile height

Question 11

for the variable “horizontal displacement” what are the factors of influence ?

Answer 11

v(x) & time in flight

Question 12

for the variable “vertical displacement” what are the factors of influence ?

Answer 12

v(y) initial & projectile height

Question 13

for the variable “trajectory” what are the factors of influence ?

Answer 13

initial velocity magnitude, projection angle and projectile height

Question 14

for the equation of constant acceleration what are equations typically used to describe ?

Answer 14

horizontal or vertical motion

Question 15

what is the formula for velocity final : v(f) = ?

Answer 15

v(f) = v(i) +at

Question 16

what does “at” stand for ?

Answer 16

acceleration time

Question 17

what are the three projectile motions equations ?the following three equations are for what ? :

1) v(f) = v(i) +at
2) d = v(i)t + 1/2at^2
3) v(f)^2 = v(i)^2 +2ad

Answer 17

analyzing projectile motion

Question 18

break analyzing projectile motion down :

Answer 18

divided motion into 2 parts : time up and time down

Question 19

define time up :

Answer 19

when becomes projectile to the highest point

Question 20

TRUE OR FALSE

v(y) = v(x) = 0

Answer 20

TRUE

Question 21

what is vertical velocity at the apex ?

Answer 21

apex = 0

Question 22

describe determining max vertical displacement

Answer 22

the process of calculating or finding the maximum vertical distance or change in position of an object or a point in a system