Projectiles

Question 1

What types of motion can you use when answering questions on projectiles?

Answer 1

Horizontal motion(→)

Vertical motion(↑)

Question 2

What do we know for horizontal motion?

Answer 2

a=0
Ux=Ucosθ
Vx=Ux

Question 3

What do we know for vertical motion?

Answer 3

a=-g
Uy=USinθ

Question 4

What does Vy = at maximum height?

Answer 4

Vy=0 at maximum height

Question 5

How can the time for the range be obtained?

Answer 5

by using Sy=0

Question 6

When working out maximum height, what motion do you use?

Answer 6

Vertical motion (↑)

Question 7

What are the steps for working out the range?

Answer 7

Using vertical motion(↑), find t
this gives us t for horizontal motion(→), and means we can work out Sx (the range)

Eg) (↑) motion: Sy=0, a=-g, Uy=Usinθ t=?
Work out t using s=ut+1/2at^2

(→) motion: a=0, Ux=UCosθ, t=t, Sx=?

Question 8

What modelling assumptions do you need to make with projectiles?

Answer 8

-the projectile is a particle
-gravity is a constant
-the effects of air resistance are negligible
-ignore any spin