Recent questions and answers in Laws of Motion

Two blocks are in contact on a frictionless table. One has mass m and another mass '2m'. A force F is applied on '2m' as shown. Now the force F is applied on 'm' from right. In the two cases respectively the ratio of force of contact between the blocks is

answered Oct 3, 2018 by pushpadubey555567123

2 answers

A block takes twice as much time to slide down a rough $45^{\large\circ}$ inclined plane as it takes to slide down an identical smooth $45^{\large\circ}$ inclined plane.The coefficient of kinetic friction between the block and the rough inclined plane is

answered Aug 9, 2018 by aloksingh2082000

2 answers

A person sitting in an open car moving at constant velocity throws a ball vertically up into air. The ball falls

answered Jul 13, 2017 by akashrao0005

2 answers

Consider a mass m attached to a string of length l performing vertical circle.find an expression for velocity at any point and tension at any point .

answered Mar 10, 2015 by sharmaaparna1

1 answer

question gave coefficient of friction to be " k " for both the blocks but if put k1=k2=k then F=0 how is this possible?

answered Dec 1, 2014 by vijayalakshmi.r

1 answer

a particle has initial velocity V=3i +4j and a constant force F = 4i-3j acts on the particle .prove that path of particle is parabolic.[where i,j represent unit vectors along x and y axis]

answered Nov 30, 2014 by vijayalakshmi.r

1 answer

two blocks m and M tied together with an inextensible string are at rest on rough horizontal surface with coefficient of friction " k ". the block m i pulled with a variable force F with a variable angle 'x' with the horizontal .the value of 'x' for which the least value of F is required to move the blocks given by

answered Nov 28, 2014 by vijayalakshmi.r

1 answer

A 60kg man stands on a spring scale in a lift.at some instant,he finds that the scale reading has changed from 60kg to 50kg for a while and then comes back to original mark.what should be concluded?

answered Nov 28, 2014 by vijayalakshmi.r

1 answer

A small marble is projected with a velocity of 10m/s in a direction 45 degrees from the horizontal y-direction on the smooth inclined plane . calculate magnitude of velocity after 2s?

answered Nov 28, 2014 by vijayalakshmi.r

1 answer

A body is moving down a long inclined plane of angle of inclination $\theta$ . The coefficient of friction between the body and the plane varies as $\mu =0.5 \;x$ Where x is the distance moved down the plane . The body will have the maximum velocity when it has travelled a distance x given by

answered Aug 29, 2014 by meena.p

1 answer

A body is sliding down a rough inclined plane of angle of inclination $\theta$ for which the coefficient of friction varies with distance x as $\mu (x)=kx$, where k is a constant . Here x is the distance moved by the body down the plane . The net force on the body will be zero at a distance $x_0$ given by :

answered Aug 29, 2014 by meena.p

1 answer

Two blocks of masses $m_1=5 \;kg$ and $m_2= 6\;kg$ are connected by a light string passing over a light friction less pulley as shown in fig. The mass $m_1$ is at rest on the inclined plane and mass $m_2$ hangs vertically . If the angle of incline $\theta =30^{\circ}$, What is the magnitude and direction of the force of friction on the $5\;kg$ block . Take $g= 10 ms^{-2}$

answered Aug 29, 2014 by meena.p

1 answer

A uniform sphere of radius R and mass M is held at rest on an inclined plane of angle $\theta$ by a horizontal string , as shown in the figure. Let $R= 20 \;cm,M= 3\;kg,$ and $ \theta= 30^{\circ}$. What is the normal force exerted on the sphere by the inclined plane ?

answered Aug 28, 2014 by meena.p

1 answer

An $8.0\;kg$ box is released on a $30^{\circ}$ inclined and accelerates down the incline at $30\;m/s^2$ Find the frictional force impending its motion . How large is the coefficient of friction in this situation ?

answered Aug 28, 2014 by meena.p

1 answer

A $12-kg$ box is released from the top of an inclined that is $5.0\;m$ long and makes an angle of $40^{\circ}$ to the horizontal. A $60-N$ friction force impedes the motion of the box. How long will it take to reach the bottom of the incline ?

answered Aug 28, 2014 by meena.p

1 answer

Suppose A box has a mass of $100\; kg$, and you have to move it up a ramp. The ramp has an angle of $23^{\circ}$. What is the force needed to get the box moving up the ramp if the coefficient of static friction is $0.20$?

answered Aug 28, 2014 by meena.p

1 answer

A box can be moved up an inclined plane with constant velocity by a force of magnitude $F_1$ or down the inclined plane with constant velocity by a force of magnitude $F_2$ . Find the coefficient of kinetic friction $\mu_k$ between the box and the inclined plane. It holds that $F_1=6F_2$ and both forces are parallel with the inclined plane. The angle $\alpha$ between the inclined plane and the horizontal plane is $15^{\circ}$

answered Aug 28, 2014 by meena.p

1 answer

A right triangular wedge of mass M and inclination angle $\theta$ , supporting a small block of mass m on its side, rests on a horizontal frictionless table, as shown in figure. Assuming all surfaces are frictionless, What horizontal force F must be applied to the system to achieve this result?

answered Aug 28, 2014 by sreemathi.v

1 answer

Two blocks of masses $m_1=m$ and $m_2=2m$ are connected by a light string passing over a frictionless pulley.The mass $m_1$ is placed on a smooth inclined plane of inclination $\theta=30^{\large\circ}$ and mass $m_2$ hangs vertically as shown in figure below.If the system is released the tension in the string is

answered Aug 28, 2014 by sreemathi.v

1 answer

Two blocks of masses $m_1=m$ and $m_2=2m$ are connected by a light string passing over a frictionless pulley.The mass $m_1$ is placed on a smooth inclined plane of inclination $\theta=30^{\large\circ}$ and mass $m_2$ hangs vertically as shown in figure below.If the system is released,the blocks move with an acceleration equal to

answered Aug 28, 2014 by sreemathi.v

1 answer

A 15 N force is applied to a $6.0\;kg$ block. Determine the acceleration of the block.

answered Aug 27, 2014 by meena.p

1 answer