Left-click: rotate, Mouse-wheel/middle-click: zoom, Right-click: pan, Escape: close
Vectors!!! Woo yeah
- Scalar quantities:
- Fully defined by magnitude only
- e.g. Time, Distance, Speed
- Distance: total length of path traveled going from A - B, vs Displacement: straight-line distance between A - B
- Vector quantities:
- Fully defined by having a magnitude and direction
- When calculating vectors, remember to add direction!!!!!!!!!
- Exception: Q asks for the magnitude of vector.
- e.g. Displacement, Velocity, Acceleration, Jerk
Measurements for scalars and vectors
- Displacement is abreviated to s!!(same as distance) directionYou may put an arrow on top of it to indicate it is a vector quantity($\vec{s}$) (meters)
- Velocity + speed : v ($ms^{-1}$)
- Acceleration: a ($ms^{-2}$)
- Force: F (Newtons, N)
- Work: W, Work = $F_{s}$, (N (????))
- $E_{k} = \frac{1}{2} mv^{2}$
- $E_{p} = mgh$
- Energy is in joules (J)
Free Body Diagrams vs Vector diagrams
Free Body Diagram: Shows all the real forces acting on a body
| Abbreviation |
Force |
| W |
Weight Force/Gravitational force |
| Lift |
N/A |
| Drag/Air resistance |
N/A |
Vector diagrams: Shows forces only, centered on a dot.
- Must have the same vector quantity
- ON each side
- Must be resolved
- i.e. 2m East, 3m West, The resultant vector would be 1m
- Define own compass direction (for relevant questions)
- Head to tail
IMPORTANT!
draw a vector diagram!
Next lesson: STAWA Prac, Investigating Vectors
- Read through instructions first?
