WEEK 4

Question 1

define a projectile

Answer 1

any object that it projected into the air

Question 2

what are the 3 components of projectile motion

Answer 2

1) a projectile can travel horizontally or vertically through the air

2) gravity only influences the vertical component of the projectile

3) vertical and horizontal components of a projectile act independently of each other

Question 3

what influences projectile motion and describe it

Answer 3

1) air resistance

• influences horizontal motion
• influences vertical motion

2) gravity:

• acceleration from gravity= 9.81metres per second
• constantly accelerates bodies in vertical direction towards the surface of the earth.

Question 4

define an upward projectile

Answer 4

• velocity is decreasing during upward flight
• velocity is increasing during downward flight
• vertical kinematics upward and downward

Question 5

hints for vertical projectile(x2)

Answer 5

• upward flight phase final velocity = 0
• downwards phase intitial vertical vellcity= 0

Question 6

define direct performance

Answer 6

directly dictated by the start of the flight

Question 7

define the influence of initial velocity

Answer 7

fixed projection angle and height

Question 8

define influence of release height

Answer 8

fixed velocity and projection angle

Question 9

what is the optimum projection angle for horizontal displacement

Answer 9

1) 0 relative projection height > optimal angle= 45 degrees

2) positive relative projection height > optimum angle less than 45 degrees