Question

A brick of mass 2 kg begins to slide down on a plane inclined at an angle of ${45}^o$ with the horizontal. The force of friction will be

• A. 19.6 sin 45^o
• B. 19.6 cos 45^o
• C. 9.8 sin 45^o
• D. 9.8 cos 45^o

Answer 1

The correct option is A

19.6 sin 45^o

For angle of repose,
Friction =Component of weight along the plane
$=mgsin\theta =2\times 9.8\times sin{45}^o=19.6sin{45}^o$