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Parametric Equations
Summary
- N-dimensional motion can be completely described by n one-dimensional
algebraic expressions along n mutually perpendicular directions
(where n is any whole number greater than zero).
- Two-dimensional motion can be completely described by two, one-dimensional
algebraic expressions along two perpendicular directions.
- Three-dimensional motion can be completely described by three,
one-dimensional algebraic expressions along three mutually perpendicular
directions.
| |
| r = |
x |
î |
+ |
y |
k̂ |
+ |
z |
k̂ |
|
r2 = |
x2 |
+ |
y2 |
+ |
z2 |
| v = |
vx |
î |
+ |
vy |
k̂ |
+ |
vz |
k̂ |
|
v2 = |
vx2 |
+ |
vy2 |
+ |
vz2 |
| a = |
ax |
î |
+ |
ay |
k̂ |
+ |
az |
k̂ |
|
a2 = |
ax2 |
+ |
ay2 |
+ |
az2 |
| |
| x = |
x(t) |
|
|
|
y = |
x(t) |
|
|
|
z = |
z(t) |
|
|
| |
| vx = |
Δx |
|
|
|
vy = |
Δy |
|
|
|
vz = |
Δz |
|
|
| Δt |
|
|
Δt |
|
|
Δt |
|
|
| ax = |
Δvx |
|
|
|
ay = |
Δvy |
|
|
|
az = |
Δvz |
|
|
| Δt |
|
|
Δt |
|
|
Δt |
|
|
| |
| x = |
x(t) |
|
|
|
y = |
x(t) |
|
|
|
z = |
z(t) |
|
|
| |
|
|
|
|
|
| vx = |
lim |
|
Δx |
|
vy = |
lim |
|
Δy |
|
vz = |
lim |
|
Δz |
| Δt → 0 |
Δt |
Δt → 0 |
Δt |
Δt → 0 |
Δt |
| ax = |
lim |
|
Δvx |
|
ay = |
lim |
|
Δvy |
|
az = |
lim |
|
Δvz |
| Δt → 0 |
Δt |
Δt → 0 |
Δt |
Δt → 0 |
Δt |
| |
| x = |
x(t) |
|
|
|
y = |
x(t) |
|
|
|
z = |
z(t) |
|
|
| |
|
|
|
|
|
| vx = |
dx |
|
|
|
vy = |
dy |
|
|
|
vz = |
dz |
|
|
| dt |
|
|
dt |
|
|
dt |
|
|
| ax = |
dvx |
= |
d2x |
|
ay = |
dvy |
= |
d2y |
|
az = |
dvz |
= |
d2z |
| dt |
dt2 |
dt |
dt2 |
dt |
dt2 |
| |