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Answer :
Final answer:
The frictional force acting on the firefighter is calculated by subtracting the net force (firefighter's mass times acceleration) from the gravitational force (firefighter's mass times gravity). This results in 504 N of frictional force.
Explanation:
The physics concept at hand here is Newton's Second Law of Motion which states that the force exerted on an object is equal to its mass times its acceleration. Additionally, we know that the frictional force is the force that opposes the motion of the firefighter. Assuming the only forces acting on the firefighter are gravity and friction, we can calculate the frictional force.
First, we calculate the force of gravity acting on the firefighter which is Force = mass x gravity. For an 84 kg firefighter, this is 84 kg x 9.8 m/s2 = 823.2 N. Next, we calculate the net force acting on the firefighter, which is Force = mass x acceleration. This gives 84 kg x 3.8 m/s2 = 319.2 N.
The frictional force is then found by subtracting the net force from the force of gravity, giving 823.2 N - 319.2 N = 504 N of friction.
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