Question

A block of mass 'm' is slipping down a rough inclined plane with constant speed. The force on block by plane is –

• A. mg
• B. $\frac { \mathrm { mg } } { 2 }$
• C. Depends upon coefficient of friction
• D. Depends upon angle of inclination

Answer 1

Answer: (D)

Depends upon angle of inclination

Answer 2

Net force on block $\overrightarrow { \mathrm { F } } _ { \text {net } }$ = $\overrightarrow { \mathrm { mg } } + \overrightarrow { \mathrm { F } } _ { \mathrm { BW } }$

As block is slipping with constant speed

$\overrightarrow { \mathrm { F } } _ { \text {net } }$ = 0

̃ $\overrightarrow { \mathrm { F } } _ { \mathrm { BW } } = - \overrightarrow { \mathrm { mg } }$

̃ $\mathrm { F } _ { \mathrm { BW } }$ = mg