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Friction Formula
Friction is the retarding force coming into play when two bodies are in contact with each other.
Friction formula in general is given by
The Normal force = Weight of the given body. Hence Normal force Fn is given by
g is the gravity.
Friction formula is used to calculate the friction between the any two given bodies.
Friction formula in general is given by
Where,
Ff is the magnitude of friction,
Ff is the magnitude of friction,
$\mu$ is the coefficient of friction and
Fn is the magnitude of normal force.The Normal force = Weight of the given body. Hence Normal force Fn is given by
Where,
m is the mass of the body and
m is the mass of the body and
Friction formula is used to calculate the friction between the any two given bodies.
Below are problems on friction which helps to know where the formula can be used:
Solved Examples
Question 1: A boy is pulling box of mass 10 Kg. What is the normal force acting and also find the frictional force if the coefficient of friction $\mu$ is 0.3?
Solution:
Given: Mass, m = 10 Kg,
Normal force, Fn =?
Normal force is given by Fn = mg
= 10 Kg $\times$ 9.8 m/s2
= 98 N.
The Frictional force is given by Ff = $\mu$ Fn
= 0.3 $\times$ 98 N.
= 29.4 N.
Solution:
Given: Mass, m = 10 Kg,
Normal force, Fn =?
Normal force is given by Fn = mg
= 10 Kg $\times$ 9.8 m/s2
= 98 N.
The Frictional force is given by Ff = $\mu$ Fn
= 0.3 $\times$ 98 N.
= 29.4 N.
Question 2: Nancy is of mass 40 Kg is sliding on the ice. If the coefficient of friction acting is 0.45. Find the frictional force acting between her and ice layer?
Solution:
Given: Mass m = 40 Kg,
Coefficient of friction $\mu$ = 0.3,
The Normal force is given by Fn = mg
= 40 Kg $\times$ 9.8 m/s2
= 392 N.
The Frictional force is given by Ff = $\mu$ Fn
= 0.45 $\times$ 392 N
= 176.4 N.
Solution:
Given: Mass m = 40 Kg,
Coefficient of friction $\mu$ = 0.3,
The Normal force is given by Fn = mg
= 40 Kg $\times$ 9.8 m/s2
= 392 N.
The Frictional force is given by Ff = $\mu$ Fn
= 0.45 $\times$ 392 N
= 176.4 N.
| More topics in Friction Formula | |
| Kinetic Friction Formula | Static Friction Formula |
| Friction Loss Formula | Friction Force Formula |