Day 49: More Rooted MisconceptionsPosted: November 11, 2013
In this scenario a sled was being pushed at a constant velocity 2 m/s, then the following question was asked;
c. Describe, in terms of the amount of force he would have to apply, what the player would have to do to make the sled move with a constant velocity of 3.0 m/s. Assume that the frictional force between the grass and the sled remains the same under all circumstances. Illustrate your answer with diagrams and/or graphs as appropriate.
It continually astounds me that even though we have had days of conversations about constant velocity and balanced forces, the idea that a higher speed requires more force is firmly rooted in their brains. Another group gave pretty much the same reasoning below. The only way we can expunge misconceptions is to address them head on!