機器
acceleration
acting
action
answer
balance
ball
demonstration
diagram
dynamic
education
educational
energy
engineering
experiment
force
gear
graphic
gravity
interaction
law
lesson
lifting
load
mass
mechanic
mechanical
model
motion
movement
physical
plane
potential
power
push
question
reaction
scale
school
science
scientific
simple
surface
system
teacher
technical
tool
weight
wheels
work
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