to move an object toward you
pull
a change in the position of an object
motion
to move an object away from you
push
a bridge that is supported by thick poles
pillar/beam bridge
a bridge with a curved arch in the center
arch bridge
a pretend version of something that scientists use when the real thing is too big, small, or complicated to work with
model
two forces that push and pull in opposite directions where one force is greater than the other so that the object moves
unbalanced forces
a person who uses science to come up with solutions to problems
engineer
a force when two objects rub together that slows the motion of an object
friction
two equal forces that push or pull in opposite directions so that the object doesn't move
balanced forces
an invisible force that pulls any object down, toward the Earth
gravity
something that happens again and again and again in a way that can be predicted
pattern
to make a plan for creating or doing something
design
a bridge where the weight is pulled up by ropes hung from tall poles
suspension bridge
to guess what will happen based on things you know
predict
a push or a pull
force