14. A sheet of paper can be withdrawn from under the bottle of milk without toppling it if the paper is jerked quickly. This is an example of a) weight b.) mass c) inertia d) friction 15.A contact force that tends to oppose relative motion between bodies in contact is known as: a) force b) friction c) tension d)compression

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!