In Case A, an object is moving in a straight line at a constant speed of...
In Case A, an object is moving in a straight line at a constant speed of 9.8 m/s. In Case B, an object is moving in a straight line with a constant acceleration of 9.8 m/s2. Which of the following statements is true?
a. A nonzero net external force acts on the object in neither case.
b. A nonzero net external force acts on the object in both cases.
c. A nonzero net external force acts on the object in Case A only.
d. A nonzero net external force acts on the object in Case B only.
Homework Answers
Ans: d. A nonzero net external force acts on the object in Case B only.
When an external force acts on an object, it accelerates; otherwise its speed remains constant (or it stays at rest if it was at rest).
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