projectile motion - curved path a falling object takes if moved horizontally , Inertia - ability of object to resist change in motion , Newton - a measure of force , first law of motion - motion of object does not change if net force is zero , 2nd law of motion - says acceleration = force divided by mass , 9.8 m/s2  - acceleration due to gravity , rolling friction - friction applied to object with wheels , static friction - initial friction on an nonmoving object , balanced forces - when opposing forces cause a net force of zero ,

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