This unit is about Newton's laws and forces in equilibrium. His first laws states that an objects ability to continue in the state it is proportional to the object's mass. In this picture it is a glue stick rolling on a table. Since a glue stick does not have much mass it will not roll as much as something like a bowling ball. Also since it is round friction does not have as much affect as it would on an object like an eraser, where it would stay at rest after you push it. As you can see Newton's first law of inertia holds true and that it is proportional to an object's mass.
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