
A screw is a special case of inclined plane.

Important Questions on Newton's Laws of Motion


Two blocks and of masses and respectively are connected by a massless inextensible string passing over a frictionless pulley as shown in the figure. Block A is lifted until block B touches the ground and then block A is released. The initial height of block A is when block B just touches the ground. The maximum height reached by block from the ground after the block A falls on the ground is


An inclined plane making an angle of with the horizontal is placed in a uniform horizontal electric field as shown in the figure. A body of mass and charge is allowed to slide down from rest at a height of . If the coefficient of friction is find the time taken by the body to reach the bottom.

A student skates up a ramp that makes an angle with the horizontal. He/she starts (as shown in the figure) at the bottom of the ramp with speed and wants to turn around over a semicircular path of radius during which he/she reaches a maximum height (at point ) from the ground as shown in the figure. Assume that the energy loss is negligible and the force required for this turn at the highest point is provided by his/her weight only. Then ( is the acceleration due to gravity)











Two blocks A and B of equal masses are in contact initially. The coefficients of friction between the inclined plane and the surface of A and B are respectively. The blocks will remain in contact and will fall with common acceleration_____

Two blocks of mass and are connected by a light string passing over a frictionless pulley. As shown in the figure, the mass is placed on a smooth inclined plane of inclination and hangs vertically. If the system is released, the block moves with an acceleration equal to


A long slope makes an angle with the horizontal. box of mass is pulled up the slope by a rope that is parallel to the slope. The coefficient of friction between the box and the slope is At the top of the slope, the rope passes over a smooth pulley. A ball of mass hangs from the other end of the rope. The ball is initially above the ground. The system is released from rest.
Find how long it will take for the box to travel up the slope.


Reason: Initial velocity of a dropping packet is equal to the velocity of the body from which it is dropped.

