Question

An object with a mass of `7 kg` is on a surface with a kinetic friction coefficient of `7`. How much force is necessary to accelerate the object horizontally at `2 m/s^2`?

Answer 1

`F=494,69 " "N`

Explanation:

`G=m*g=7*9,81=68,67 N" gravity of object"`
`N=-G" normal force to the contacting surfaces"`
`F_f=k*N=7*68,67=480,69N`
`"The friction force for contacting surfaces"`
`F_"net"=m*a" The Newton's second law"`
`F_"net"=F-F_f`
`F-F_f=m*a`
`F-480,69=7*2`
`F-480,69=14`
`F=480,69+14`
`F=494,69 " "N`