Lecture 8 - Projectile Motion

Question 1

in the flight phase in sport, the centre of mass will follow

Answer 1

projectile motion

Question 2

if we ignore air resistance, the flight of a projectile is

Answer 2

a parabola

Question 3

if we ignore air resistance ascending and descending parts of trajectory are

Answer 3

symetrical

Question 4

at the apex of a projectile velocity =

Answer 4

0

Question 5

ignoring air resistance in projectile motion Viy = ….. when at the same height

Answer 5

-Vfy

Question 6

what are the factors influencing projectiles

Answer 6

v = projection velocity vector

h = projection height

angle = projection angle

Question 7

vector velocity of projection has a …. and a

Answer 7

horizontal and vertical component

Question 8

during flight vy decreases at a rate of …

Answer 8

9.81 m/s every second (hence why vertical acceleration is -9.81)

Question 9

vy in projectile motion determines the

Answer 9

change in height and flight time

Question 10

vx in projectile motion is …..

Answer 10

constant and is needed to determine range

Question 11

the launch height of something effects

Answer 11

range of projection

Question 12

to increase the range of projection you could

Answer 12

have lower launch angle with positive projection height (top)

have higher launch angle with negative projection height (bottom)

Question 13

the centre of an object (projectile motion) does not …

Answer 13

does not follow the path like the centre of mass does

Question 14

what is a negative relative projection height

Answer 14

if the projection point is lower than the surface which the object lands

Question 15

what is a positive relative projection height

Answer 15

if the projection point is higher than the surface which the object lands