They identify forces that enable them to balance an object on their hand, then construct a balance and use it to compare the mass of objects.
(They; identify; forces that enable them to balance an object on their hand, then construct a balance and use it to compare the mass of objects) (forces; enable; them; to balance an object on their hand, then construct a balance and use it to compare the mass of objects) (them; to balance; an object; on their hand) (them; to construct; a balance; T:then) (them; to use; it; to compare the mass of objects; T:then)
They forces them them them
identify enable to balance to construct to use
forces that enable them to balance an object on their hand, then construct a balance and use it to compare the mass of objects
them to balance an object on their hand, then construct a balance and use it to compare the mass of objects
an object on their hand
a balance T:then
it to compare the mass of objects T:then