A1 Kinematics

Kinematics

A1.1. Displacement/Distance

Distance = how far travelled A→B→C scalar
Displacement = difference in positions: A→C: shortest path - vector

measured in m, symbol: s

A1.2. Velocity

Velocity: Rate change position: ^s(disp)/_t -vect

Speed: dist trav per unit time - ^s(dist)/_tscal.

measured in ms^-1, symbol: v (or u)
v = final, u = initial

A1.3 Av/Inst./Const./Relative velocity

1. Average: ^s(tot)/_t(tot) (entire trip) = ^u+v/_t

2. Instantaneous: ^ds/_dt (at that time/point)

3. Constant: v is non-changing, 1=2 ^

4. Relative: adding/substr. vectors

A1.4 Acceleration

Rate of change of velocity: a = ^{change in v}/_t
Vector, ms^-2, changes in velocity.

+faster, - slower

A1.5 SUVAT

1. v=u+at

2. v² = u² + 2as

3. s = ut + ½ at²

4. s = vt - ½ at²

5. ½ (u+v) t