Friction

Front

A cyclist while negotiating a circular path with speed 20 m s^-1 is found to bend an angle by 30^o with vertical. What is the radius of the circular path? (given, g = 10 m s^-2)

Back

69.3 m

Front

Angle between force of friction and normal reaction for a body of weight W on a frictional surface:

Back

90⁰

Front

A cyclist is moving with a velocity v turns a circular path of radius r. His inclination with the vertical is given by:

Back

tan θ = v² / rg

Front

A cyclist going round in a circular track at a constant speed has:

Back

acceleration constant magnitude with its direction changing

Front

A body of mass m slides down a rough inclined plane of angle θ. The acceleration of the body at any instant is:

Back

g (sin θ - μ_k cos θ)

Front

The body will move only when:

• Force of friction = applied force
• Force of friction < applied force
• Force of friction > applied force
• All of the above

Back

Force of friction < applied force

Front

A body slipping on a rough horizontal plane moves with a deceleration of 4.0 m/s². What is the coefficient of kinetic friction between the block and the plane? (g= 10 ms^-2)

Back

0.4

Front

When a body is moving on a surface, the force of friction is called:
- Static friction
- Dynamic friction
- Limiting friction
- Rolling friction

Back

Dynamic friction

Front

If μ_s, μ_k and μ_r are coefficients of static friction, sliding friction and rolling friction, then list the correct order of these coefficients.

Back

μ_r < μ_k < μ_s

Front

A box is placed on an inclined plane and has to be pushed down. The angle of inclination is:
Options: Equal to angle of friction, More than angle of friction, Equal to angle of repose, Less than angle of repose

Back

Less than angle of repose