Question

A stagehand starts sliding a large piece of stage scenery originally at rest by pulling it horizontally with a force of 176 N. What is the coefficient of static friction between the stage floor and the 490 N piece of scenery? a. 0.36 c. 2.8 b. -2.8 d. -0.36

Answer 1

Option (a)

Explanation :

A stage hand starts sliding a large piece of stage scenery originally at rest by pulling it horizontally with a force of 176 N.

Hence Force applied
`\text { Fapplied }=176 \mathrm{N}`

Force on piece of scenery
`\mathrm{F}_{\mathrm{g}}=490 \mathrm{N}`

`\Sigma \mathrm{F} \mathrm{y}=\mathrm{F} \mathrm{n}-\mathrm{Fg}=0`

`\mathrm{Fn}=\mathrm{Fg}`

`\mathrm{FS}_{\mathrm{max}}=\mathrm{F}_{\mathrm{applied}}`

µk =
`\frac{\mathrm{Fs} \max }{\mathrm{Fn}}`

=
`\frac{\text { Fapplied }}{\mathrm{Fg}}`

=
`(176)/(490)` =0.36

coefficient of static friction is 0.36