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32 votes
32 votes
5. A 72 kg firefighter slides down a fire pole with a downward acceleration of 2.80 m/s2.

What is the force of friction exerted by the pole on the firefighter?(You will need to find
the weight force acting on the object by knowing the mass.)
or

User Letstango
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1 Answer

21 votes
21 votes

Answer:

Step-by-step explanation:

Without friction, the firefighter would accelerate downward at 9.81 m/s²

As he/she only accelerates at 2.80 m/s², this means the friction is causing an upward acceleration of 9.81 - 2.80 = 7.01 m/s²

Ff = ma

Ff = 72(7.01) = 504.72 = 505 N upward

User John Zwinck
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2.8k points