Part A IP A backpack full of books weighing 59.1 N rests on a table in a physics

Question

Part A IP A backpack full of books weighing 59.1 N rests on a table in a physics laboratory classroom. A spring with a force constant of 170 N/m is attached to the backpack and pulled horizontally, as indicated in the figure.(Figure 1) If the spring is pulled until it stretches 2.90 cm and the pack remains at rest, what is the force of friction exerted on the backpack by the table? A2 Submit My Answers Give Up Incorrect; Try Again; 4 attempts remaining Part B Does your answer to part A change if the mass of the backpack is doubled? Explain. Essay answers are limited to about 500 words (3800 characters maximum, including spaces) Figure 1 of 1 3800 Character(s) remaining Submit My Answers Give Up ovide Feedback Continue

Explanation / Answer

Part A:

Spring constant = 170N/m

elongation of spring=2.9cm = 0.029m

Since bag is at rest,friction force=force in spring=170*0.029=4.93N

Part B:

No. This is because applied forcce is independent of mass of books in the bag.If the spring is stretched by the same amount,then friction force mobilised will be same as part A

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