Short answer questions: Each of the following questions, or question parts shoul

Question

Short answer questions: Each of the following questions, or question parts should be answerable in a few (1-3) sentences and/or a diagram. Point form answers are acceptable as long as they are clear. No calculations are required. S1. The graph at right shows forces exerted on a box being pushed by a person across a flat floor. The box is being pushed with an applied force that is shown. The graph also shows the friction force. a) Identify when the block started to slip. Explain how you know, and what s happening at that instant. [2 marks] b) Draw the free body diagram for the block at time A. Don?t forget to include the net force near the free body diagram. [3 marks] c) On the axes below the F vs. t graph, sketch the velocity vs. time graph for this object. [2 marks]

Explanation / Answer

1) the box started to slip when the friction changed suddenly

2) Fnet and F applied to the right

friction to the left

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