# data[].attributes.body
the size of the force depends on the masses of the objects and the distance between objects

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- the increase of mass
- the decrease of distance between two objects

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weight changes when gravitational force changes

# data[].attributes.body
an object's mass does not change.

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a measure of the amount of matter in an object.

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kg, grams, mg

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a measure of the gravitational force exerted on an object; value can change with location in the universe.

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all objects in the universe attract each other through gravitational forces.

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- why do objects fall towards earth?
- what keeps planets moving in the sky?

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all matter has mass; gravity is a result of mass

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gravity can change the motion of an object by changing its speed, direction, or both

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a force of attraction between objects that is due to their masses.

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there is movement; the forces are unequal

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there is no movement; the forces are equal

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average acceleration=
(final velocity-starting velocity) / time is takes to change velocity

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velocity is relative to a certain direction.

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average speed on a graph move at a constant rate on a graph

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- earth's surface
-trees
-buildings

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meters/second
km/h
ft/s
mi/h

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produce a change in motion

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balanced forces will not cause a change in motion

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gravity & magnetism

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distance / time

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the combination of all of the forces acting on an object

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the SI unit for force (symbol N)

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a push or a pull exerted on an object in order to change the motion of the object; force has size and direction.

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the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change.

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the speed of an object in a particular direction.

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the distance traveled divided by the time interval during which the motion occured.

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an object's change in position relative to a reference point.

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a force that opposes motion between two surfaces that are in contact.