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1. When you stand on two bathroom scales, one foot on each scale with your
weight evenly distributed, each scale will read what?
Answer: Half your weight.
2. When Nellie Newton hangs evenly by a pair of vertical ropes, the tension in the
rope on the right will be what?
Answer: Half her weight.
3. What can be said about the acceleration of objects in free fall, regardless of
their mass?
Answer: Objects in free fall have equal acceleration, regardless of their mass.
4. What is a vector?
Answer: An arrow that represents the magnitude and direction of a quantity.
5. What is inertia?
Answer: The tendency of an object to resist any change in its motion.
6. Define acceleration.
Answer: Change of velocity (Δv) / time interval (Δt).
7. What is mechanical equilibrium?
Answer: The state of an object or system of objects for which there are no changes in
motion. In accord with Newton’s first law, if an object is at rest, the state of rest persists.
If an object is moving, its motion continues without change.
8. True or false: An airplane in an acrobatic loop-the-loop maneuver is in
dynamic equilibrium if the speed is constant.
Answer: False.
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