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the kilogram

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

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a measure of the amount of matter in an object

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can change the motion by changing its speed and direction

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

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motor oil, wax, grease

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are substances that are applied to surfaces to reduce the friction between surfaces.

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pencil leaving a mark, walking then you fall

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holes in your socks, erosion.

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disappears as soon as the object starts

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when a force is applied to an object but the object doesn't move.

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means moving
slide past one another or roll over another surface.

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can cause a moving object to slow down

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

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Produces a change in motion

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will not cause a change in motion.

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the combination of all of the forces acting on an abject.

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the SI unit for force

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

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The acceleration that occurs in circular motion.

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final velocity - starting velocity divided by time it takes to change velocity

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

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combine two velocities that are in the same direction, add them to find the resultant velocity

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Velocity must include a reference point.

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the speed of an object in a particular direction.

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total distance divided by total time

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

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