In what kind of path would the planets move if no force acted on them?
A) Parabolas, like a thrown rock.
B) Straight line with an acceleration of 10 m/sec2.
C) Straight line with no acceleration.
D) Larger elliptical orbits.
E) They would continue in their present orbits, since they already have no force on them.
Question 2
An object is moving with constant non-zero velocity. Which of the following statements about it must be true?
A) The net force on the object is zero.
B) A constant force is being applied to it perpendicular to the direction of motion.
C) A constant force is being applied to it in the direction opposite of motion.
D) A constant force is being applied to it in the direction of motion.
E) Its acceleration is in the same direction as it velocity.
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