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Grade
10/10

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When an object is in motion, it will stay in motion until another force acts upon it. In the Hoop-and-Marker Activity, the hoop was in motion while it was pulled away, and the marker was in motion after the hoop was moved.

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This videos explain all concepts shown above.
https://www.youtube.com/watch?time_continue=90&v=YbWjx3LUc0U    https://www.youtube.com/watch?time_continue=111&v=08BFCZJDn9w

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Two forces are unbalanced when they act upon the same object but one is stronger than the other, moving the object in the direction the stronger force is pushing/pulling. This was seen in the Hoop-and-Marker Activity when the hoop was pulled away.

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This describes when two equal forces act upon the same object from opposite directions, keeping the object at rest. In the Hoop-and-Marker Activity, the objects were at rest before the hoop was pulled away. The hoop was pushing on the marker but gravity was pulling down at the same time

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Inertia is an object's  inclination to resist a change in its motion. In the Hoop-and-Marker Activity, this was seen when the objects remained stacked on one another until the hoop was moved.

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This means that an object is staying in one place. In the Hoop-and-Marker Activity the jar, hoop, and marker were at rest before the hoop was pulled away.

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Mass is how inertia is measured. In the Hoop-and-Marker Activity, we could tell that the hoop's mass was less than the mass of the jar because the jar required more force than the hoop to move.

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Newton's First Law states that an object will remain at rest or in uniform motion (in a straight line) unless an external force acts upon it.

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A force is any push or pull on an object (it can't always be seen). This was seen in the Hoop-and-Marker Activity when the hoop was pulled from on top of the jar. Gravity pulled the marker downward. Newton's First Law (right) refers to forces acting on objects in motion and at rest.