PhysicsLAB Worksheet
Test Scenario: Force Probe Experiment
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During a demonstration a wooden block was dragged by a force probe across a wooden plank.  The probe began pulling when the wooden block was at rest.
 
Refer to the following information for the next two questions.

Shown below is a graph of Force vs Time recorded by the probe ware.
 
 
According to this graph, what was the value of the
 
 
 
(a) starting friction (or maximum static friction) between the two surfaces 

(b) kinetic friction between the two surfaces 

Refer to the following information for the next three questions.

If the wooden block had a mass of 311 grams, what was the
(c) coefficient of static friction? 

(d) coefficient of kinetic friction? 

(e) Describe what was happening to the block during the time circled? 

Refer to the following information for the next five questions.

If a 500-gram mass had been placed on top of the wooden block how would its presence affect your previous answers to parts (a), (b), (c), and (d)?
 
(g) answer (a) would
 
(g) answer (b) would
 
(g) answer (c)would
 
(g) answer (d) would
 
(h).  The coefficient of static friction is always larger than the coefficient of kinetic friction.
 



 
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