Linear Kinematics 2

Question 1

Motion in flight - Uniform acceleration definition

Answer 1

• Rate of change velocity is constant
• Acceleration constant
• when net external force is constant (unchanging)
• during flight there is a vertical and horizontal component to motion (consider separately)

Question 2

Constant acceleration example

Answer 2

• ball thrown in the air is constantly vertically decelerating downwards (crosses 0 on a graph)
• at highest point velocity is 0
• ball = constant weight = constant force = gravity = -9.81 m.s-2

Question 3

Equations of uniform acceleration (suvat) (assume air resistance is negligible)

Answer 3

u = initial velocity
v = final velocity
s = displacement of object
a = acceleration (constant)
t = time

V = u + at
V2 = U2 + 2as
S = ut + 1/2 at2

Question 4

Vertical & horizontal acceleration values

Answer 4

Vertically = 9.81 (negative for upwards positive for downwards movement)

Horizontally = always zero

Question 5

Motion in flight rules

Answer 5

time up = time down (apply to sport)

For horizontal A = 0 always

Question 6

Projectile motion rules

Answer 6

Resultant velocity (v res) is influenced by horizontal (Vy) & vertical (Vx) velocity

Question 7

Greater vertical velocity results in:

Answer 7

^ height, flight time, distance

Question 8

Projectile motion equation

Answer 8

V res2 = Vx2 + Vy2

Question 9

Projectile motion angle equation

Answer 9

Tan()= Vy/Vx (opposite/adjacent)

45 degrees should give max distance