Question

8. A 20 newton object is pulled along a surface at a constant speed of 3.0 meters per second using a force of 4.5 newtons. The kinetic coefficient of friction is closest to
(1) 0.23
(2) 0.30
(3) 0.67
(4) 4.4

Proof: Draw sketch / Show calculations.​

Answer 1

To calculate the kinetic coefficient of friction is closest to: 1. 0.23.

Given the following data:

• Horizontal force = 4.5 Newton

• Normal force = 20 Newton

• Speed = 3.0 m/s

To calculate the kinetic coefficient of friction:

Mathematically, the kinetic force is given by this formula;

$F_k = uF_n$

Where;

• $F_k$ represents the kinetic force.

• $F_n$ is the normal force.

• μ represents the kinetic coefficient of friction.

Making μ the subject of formula, we have:

$u=\frac{F_k}{F_n}$

Substituting the given parameters into the formula, we have;

$u=\frac{4.5}{20}$

u = 0.225 ≈ 0.23

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