Question

What applied horizontal force will accelerate a 200 kg crate at 1 m/s squared across a factory floor against a friction force half its weight? A 600 NB 1600 NC 1200 N D 2400 N

Answer 1

We have the next data

m= 200 kg

a=1m/s^2

first we need to calculate the weight

`W=200\cdot9.8=1960N`

Then we need to calculate the friction force

`F_R=(1960)/(2)=980N`

then

`\begin{gathered} F-Fr=ma \\ F-980=200(1) \\ F=980+200=1180N \end{gathered}`

the nearest value is 1200N therefore the correct choice is C.