To reach the orbit, an instrument in the flight control room always monitors the position of the shuttle space an calculates velocity and the acceleration from a given position.

- Position

Position is the location of a particle relative to a frame of reference and expressed by the vector quantity r.

In a Cartesian coordinate, we use unit vector perpendicular to each other :

Unit vector i ( in x direction) and unit vector j ( in y direction).

If the particle or object is at point (x,y), then is position expressed as

r = xi + yj

r = 5 i+ 5 j

2. Displacement is the change in position of partikel expressed as a vector quantity Δr

If r0 is the initial position and rt is the final position, then the displacement can be written mathematically as

Δr = rt – r0

Or

Δr = Δxi + Δyj

- Distance

Distance can bd write mathematically using Phytagoras theorem.

Δr =

And the direction of the dicplacement θ is

tg θ =

Example

Δr =

Δr =

Δr =

Δr =

Δr = 5

tg θ = = = 0, 75

θ = 300

learning physics in physics education site, may be useful

## 0 comments:

## Post a Comment