A Common Experience Is to Find That a Steady Pull

question 50

Multiple Choice

A common experience is to find that a steady pull is required to keep an object moving, even on a level surface, when friction is present. Analyzing this experience in light of the laws of motion, the accepted conclusion is that

• A) the laws of motion do not apply where there is friction.
• B) a frictional force exactly opposes your pull and the first law applies.
• C) the object is really accelerating but it is not apparent.
• D) your pull is canceled by the third law reaction force.
• E) the laws of motion only apply when you start pulling or stop.

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