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law of universal gravitation newton on chalkboard
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action
apple
background
blackboard
blank
board
brain
chalk
chalkboard
class
classroom
drawing
education
empty
engineering
equations
flow
force
frame
gravitation
gravitational
gravity
green
illustration
isolated
law
mass
movement
newton
observation
observe
physics
professor
rate
research
school
science
scientist
statement
study
success
symbol
texture
theory
time
universal
vector