Questions in Laws of Motion

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A block is lying on an inclined plane which makes 60° with the horizontal. If coefficient of friction between block and plane is 0.25 and $g = 10\,m/{s^2}$, then acceleration of the block when it moves along the plane will be
A body of mass 100 g is sliding from an inclined plane of inclination 30°. What is the frictional force experienced if $\mu = 1.7$
A body takes just twice the time as long to slide down a plane inclined at 30o to the horizontal as if the plane were frictionless. The coefficient of friction between the body and the plane is
A brick of mass 2 kg begins to slide down on a plane inclined at an angle of 45o with the horizontal. The force of friction will be
The upper half of an inclined plane of inclination $\theta$ is perfectly smooth while the lower half is rough. A body starting from the rest at top comes back to rest at the bottom if the coefficient of friction for the lower half is given by
A body is sliding down an inclined plane having coefficient of friction 0.5. If the normal reaction is twice that of the resultant downward force along the incline, the angle between the inclined plane and the horizontal is
A body of mass 10 kg is lying on a rough plane inclined at an angle of $30^o$ to the horizontal and the coefficient of friction is 0.5. the minimum force required to pull the body up the plane is
A block of mass 1 kg slides down on a rough inclined plane of inclination 60o starting from its top. If the coefficient of kinetic friction is 0.5 and length of the plane is 1 m, then work done against friction is (Take g = 9.8 m/s2)
A block of mass 10 kg is placed on an inclined plane. When the angle of inclination is 30o, the block just begins to slide down the plane. The force of static friction is
A body of 5 kg weight kept on a rough inclined plane of angle 30o starts sliding with a constant velocity. Then the coefficient of friction is (assume g = 10 m/s2)

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