Probing the positive velocity
Velocity must be
Below is a digram of a ball and track setup. The ball is started
in the position shown by a small nudge directed to the right.
Students are asked to construct a velocity versus time graph for the
ball from the time it starts until the time it returns to its
Students suffering from this misconception will plot the velocity
above the v=0 axis of a velocity versus time graph (similar to the
Related misconceptions/student difficulties that may arise in
position and velocity graphs as the path of the particle.
difficulty relating real world motions to a graph and
(negative) slope means that an object is speeding up (slowing
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