6. A force that resist motion created by objects rubbing together is__.
a. gravity
b. friction
c. speed
d. force
7. A force that pulls objects toward each other is__.
a. force
b. frame of reference
c. gravity
d. kinetic energy
8. A force that sets an object into motion is
a. balanced
b. friction
c. unbalanced
d. inertia
9. Velocity is measure of speed takes into account the
a. weight of an object
b. direction of movement
c. force of movement
d. acceleration of an object
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