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Perpendicular
Distance
Moment
Forces
Turning Effect
Angles
Concentration of mass
Point of suspension
weight
plumb line
pivot
moments
symmetry
equal
anticlockwise
clockwise
moments
pivot
tension
centre of mass
moments
low and wide base
pivot
resultant
friction
force
velocity
speed
direction
centripetal
tension
radius
space stations
decreases with distance
plantets
orbits
satellites
geostationary
low polar orbit
light
magnification
mirrors
real and virtual
light rays
reflection
incident ray
ray diagrams
virtual
diverging
converging
vertex
concave
convex