The determination for the modal age level for grades seven and nine for the difficulty of the principle: a body at rest or in motion will remain at rest or continue in motion in a straight line unless compelled by some force to change its condition of rest or motion.

Finigan, Francis X.2014-11-172014-11-1719531953b14679838https://hdl.handle.net/2144/9527Thesis (Ed.M.)--Boston Universityen-USBased on investigation of the BU Libraries' staff, this work is free of known copyright restrictions.The determination for the modal age level for grades seven and nine for the difficulty of the principle: a body at rest or in motion will remain at rest or continue in motion in a straight line unless compelled by some force to change its condition of rest or motion.Thesis/Dissertation