A student performs an experiment on measuring friction forces in different trials. For trial A, she pulls a wooden block across a horizontal surface with a constant speeD) For trial B, she inclines the same surface at angle ? with respect to the horizontal. Which of the following is true about the friction force between the block and the surface?
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A student performs an experiment on measuring friction forces in different trials. For trial A, she pulls a wooden block across a horizontal surface with a constant speed. For trial B, she inclines the same surface at angle θ with respect to the horizontal. Which of the following is true about the friction force between the block and the surface?
The friction force in trial B is greater.
The friction force is the same in both trials.
The friction force is independent of θ.
The friction force in trial B is less.
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