Laws Of Motion CBSE Questions & Answers

A stone of mass 0.25 kg tied to the end of a string is whirled round in a circle of radius 1.5 m with a speed of 40 rev./min in a horizontal plane. The speed is then increased beyond the maximum permissible value, and the string breaks suddenly, which of the following correctly describes the trajectory of the stone after the string breaks

Figure shows a man standing stationary with respect to a horizontal conveyor belt that is accelerating with 1 m \({{\text{s}}^{ - {\text{2}}}}\). What is the net force on the man?

Figure shows a man standing stationary with respect to a horizontal conveyor belt that is accelerating with 1 m \({{\rm{s}}^{ - {\rm{2}}}}\). If the coefficient of static friction between the man’s shoes and the belt is 0.2, up to what acceleration of the belt can the man continue to be stationary relative to the belt ?

A stone of mass m tied to the end of a string revolves in a vertical circle of radius R. if \({{\rm{T}}_{\rm{1}}}\) and \({{\rm{v}}_{\rm{1}}}\) denote the tension and speed at the lowest point. \({{\rm{T}}_{\rm{2}}}\) and \({{\rm{v}}_{\rm{2}}}\) denote corresponding values at the highest point. The net forces at the lowest and highest points of the circle directed vertically downwards at the Lowest Point and Highest Point are

A helicopter of mass 1000 kg rises with a vertical acceleration of 15 m \({{\rm{s}}^{ - {\rm{2}}}}\). The crew and the passengers weigh 300 kg. Give the magnitude and direction of the force on the floor by the crew and passengers,

A helicopter of mass 1000 kg rises with a vertical acceleration of 15 m \({{\rm{s}}^{ - {\rm{2}}}}\). The crew and the passengers weigh 300 kg. Give the magnitude and direction of the action of the rotor of the helicopter on the surrounding air

A helicopter of mass 1000 kg rises with a vertical acceleration of 15 m \({{\rm{s}}^{ - {\rm{2}}}}\) . The crew and the passengers weigh 300 kg. Give the magnitude and direction of the force on the helicopter due to the surrounding air.

A stream of water flowing horizontally with a speed of 15 m \({{\rm{s}}^{ - {\rm{1}}}}\) gushes out of a tube of cross-sectional area \({\rm{1}}{0^{ - {\rm{2}}}}\) \({{\rm{m}}^{\rm{2}}}\), and hits a vertical wall nearby. What is the force exerted on the wall by the impact of water, assuming it does not rebound?

An aircraft executes a horizontal loop at a speed of 720 km/h with its wings banked at \({\rm{15}}^\circ \). What is the radius of the loop?

A train runs along an unbanked circular track of radius 30 m at a speed of 54 km/h. The mass of the train is 106 kg. What is the angle of banking required to prevent wearing out of the rail?

You may have seen in a circus a motorcyclist driving in vertical loops inside a death well’ (a hollow spherical chamber with holes, so the spectators can watch from outside). What is the minimum speed required at the uppermost position to perform a vertical loop if the radius of the chamber is 25 m?

A monkey of mass 40 kg climbs on a rope which can stand a maximum tension of 600 N. What is the tension in the rope if the monkey climbs up with an acceleration of 6 m \({{\rm{s}}^{ - {\rm{2}}}}\)

A monkey of mass 40 kg climbs on a rope which can stand a maximum tension of 600 N. What is the tension in the rope if the monkey climbs down with an acceleration of 4 m \({{\rm{s}}^{ - {\rm{2}}}}\)

A monkey of mass 40 kg climbs on a rope which can stand a maximum tension of 600 N. What is the tension in the rope if the monkey climbs up with a uniform speed of 5 m \({{\rm{s}}^{ - {\rm{1}}}}\)

A monkey of mass 40 kg climbs on a rope which can stand a maximum tension of 600 N. What is the tension in the rope if the monkey falls down the rope nearly freely under gravity?