Question

which formula is used to calculate the force of friction? a. $f = \mu \times n$ b. $f = \frac{v}{t}$ c. $f = m \times a$ d. $f = \frac{d}{t}$

Explanation:

Step1: Analyze each formula

• Option a: The formula \(f = \mu\times N\) is the formula for the force of friction, where \(\mu\) is the coefficient of friction and \(N\) is the normal force.
• Option b: The formula \(f=\frac{v}{t}\) is the formula for average velocity (\(v\) is velocity and \(t\) is time), not force of friction.
• Option c: The formula \(f = m\times a\) is Newton's second law (\(m\) is mass and \(a\) is acceleration), representing the net force acting on an object, not specifically the force of friction.
• Option d: The formula \(f=\frac{d}{t}\) is the formula for average speed (\(d\) is distance and \(t\) is time), not force of friction.

Answer:

A. \(f = \mu\times N\)