Question

(a) What is the maximum frictional force (in N) in the knee joint of a person who supports 45.0 kg of her mass on that knee if the coefficient of static friction is 0.016

Answer 1

f = 7.06 N

Step-by-step explanation:

The maximum frictional force on the knee joint of the person can be given by the following formula:

`f = \mu R = \mu W \\`

where,

f = maximum frictional force = ?

μ = static friction coefficient = 0.016

W = Weight load on knee = mg

m = mass supported by knee = 45 kg

g = acceleration due to gravity = 9.81 m/s²

Therefore,

`f = \mu mg\\f = (0.016)(45\ kg)(9.81\ m/s^2)\\`

f = 7.06 N