Topic 6

Question 1

what is a projectile

Answer 1

any object/body moving through the air unassisted

Question 2

2 external forces that act on a projectile

Answer 2

weight due to gravity & air resistance

Question 3

trajectory

Answer 3

path followed by a projectile (normally parbolic)e

Question 4

range

Answer 4

distance a projectile travels while in the air.
vertical & horizontal range.

Question 5

3 factors impacting the range & trajectory

Answer 5

velocity at release, angle of release, height of release.

Question 6

vertical velocity

Answer 6

determines max height

Question 7

horizontal velocity

Answer 7

determines distance travelled

Question 8

velocity at release

Answer 8

• instantaneous resultant velocity of a projectile at the time of release
• most influential factor affecting horizontal/vertical range
• high velocity = high H & V range, due to high time in air
• greater velocity = more closely the optimum angle approaches 45 degrees (for any given height)

Question 9

Projection angle

Answer 9

the angle formed between the direction at which the body is projected and the horizontal

Question 10

optimum angle of release for max. vertical displacement

Answer 10

> 45 degrees

Question 11

optimum angle of release for max. horizontal displacement

Answer 11

depends on the release height
- level height = 45 degrees
- take off greater than landing = <45 degrees
- take off less than landing = >45 degrees

Question 12

tennis serve optimum angle

Answer 12

-3 to 15 degrees

Question 13

discus optimum angle

Answer 13

15 to 35 degrees

Question 14

high jump optimum angle

Answer 14

40 to 48 degrees

Question 15

height of release

Answer 15

difference between the height an object is initially projected and the height at which it lands.
So, if netball hoop is 3m, and it is released at 1.5m, the relative projection height = 1.5m