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Physics-

General

Easy

Question

Net force acting on block of mass m if the block is stationary with respectively lift is

zero
ma (upwards)
$m g s i n θ$
ma (downwards)

The correct answer is: ma (upwards)

Related Questions to study

Block A is placed on a rough wedge B which is placed on a smooth surface. The wedge has angle of inclination of 30° and is imparted a horizontal acceleration g towards right. Block A is given an initial velocity $v subscript 0 end subscript$ from rest. Find the coefficient of friction for which block A moves with constant velocity $v subscript 0 end subscript$ with respect to wedge $open parentheses g equals 10 text end text m divided by s to the power of 2 end exponent close parentheses$

Block A is placed on a rough wedge B which is placed on a smooth surface. The wedge has angle of inclination of 30° and is imparted a horizontal acceleration g towards right. Block A is given an initial velocity $v subscript 0 end subscript$ from rest. Find the coefficient of friction for which block A moves with constant velocity $v subscript 0 end subscript$ with respect to wedge $open parentheses g equals 10 text end text m divided by s to the power of 2 end exponent close parentheses$

physics-General

In the diagram shown in figure wedge of mass M is stationary. Block of mass m=2 kg is slipping down. Force of friction on the wedge from ground is : $open parentheses g equals 10 text end text m divided by s to the power of 2 end exponent close parentheses$

In the diagram shown in figure wedge of mass M is stationary. Block of mass m=2 kg is slipping down. Force of friction on the wedge from ground is : $open parentheses g equals 10 text end text m divided by s to the power of 2 end exponent close parentheses$

physics-General

In case (i) wedge B is stationary and block A starts sliding when the angle of plane is greater than $theta$ , while in case (ii) wedge B is moving upwards with an acceleration $a subscript o end subscript$ and the block A starts sliding when the angle of plane is greater than $alpha$ . Coefficient of friction between A and B in both the cases is same. Then :
i)
ii)

In case (i) wedge B is stationary and block A starts sliding when the angle of plane is greater than $theta$ , while in case (ii) wedge B is moving upwards with an acceleration $a subscript o end subscript$ and the block A starts sliding when the angle of plane is greater than $alpha$ . Coefficient of friction between A and B in both the cases is same. Then :
i)
ii)

physics-General

parallel

$A$ sphere B is in air sandwiched between blocks A and C which are compressed by two springs of spring constants $k subscript 1 end subscript$ and $k subscript 2 end subscript$ compressed by $x subscript 1 end subscript$ and $x subscript 2 end subscript$ respectively. The coefficient of friction between sphere and blocks is same and other surface are smooth. The ratio $fraction numerator k subscript 1 end subscript over denominator k subscript 2 end subscript end fraction$ will be :

$A$ sphere B is in air sandwiched between blocks A and C which are compressed by two springs of spring constants $k subscript 1 end subscript$ and $k subscript 2 end subscript$ compressed by $x subscript 1 end subscript$ and $x subscript 2 end subscript$ respectively. The coefficient of friction between sphere and blocks is same and other surface are smooth. The ratio $fraction numerator k subscript 1 end subscript over denominator k subscript 2 end subscript end fraction$ will be :

physics-General

A block A of mass 2 kg is resting on the block B of mass 3 kg which is placed on a 30° incline. The coefficient of friction between two blocks is 0.30 and block B and incline is 0.10. A force of 4 N is applied to block A parallel to the incline. Find the acceleration of block A :

A block A of mass 2 kg is resting on the block B of mass 3 kg which is placed on a 30° incline. The coefficient of friction between two blocks is 0.30 and block B and incline is 0.10. A force of 4 N is applied to block A parallel to the incline. Find the acceleration of block A :

physics-General

A block of mass m is placed on another block of mass M. Two blocks are sliding on a smooth inclined plane. Then, the frictional force developed between the blocks is :

A block of mass m is placed on another block of mass M. Two blocks are sliding on a smooth inclined plane. Then, the frictional force developed between the blocks is :

physics-General

parallel

Three blocks A, B and C of different masses as shown, are placed over each other. The coefficients of friction are shown. Blocks placed in one vertical line are made to move towards right with same velocity at the same instant. Find the time taken by the upper block to slide down the middle block:

Three blocks A, B and C of different masses as shown, are placed over each other. The coefficients of friction are shown. Blocks placed in one vertical line are made to move towards right with same velocity at the same instant. Find the time taken by the upper block to slide down the middle block:

physics-General

In the arrangement as shown masses of block A and B are 4 m and m respectively. The coefficient of friction between all surfaces is 0.05. What should be ratio of $fraction numerator P over denominator Q end fraction$ so that both blocks A and B move with same acceleration of $5 text end text m divided by s to the power of 2 end exponent ? open parentheses text end text g equals 10 text end text m divided by s e c to the power of 2 end exponent close parentheses$

In the arrangement as shown masses of block A and B are 4 m and m respectively. The coefficient of friction between all surfaces is 0.05. What should be ratio of $fraction numerator P over denominator Q end fraction$ so that both blocks A and B move with same acceleration of $5 text end text m divided by s to the power of 2 end exponent ? open parentheses text end text g equals 10 text end text m divided by s e c to the power of 2 end exponent close parentheses$

physics-General

The coefficient of frictions and masses of various blocks are shown. A force 2 N is applied on block B. What will be the acceleration of block B after 4 seconds $open parentheses g equals 10 text end text m divided by s to the power of 2 end exponent close parentheses 1.6 text end text m$

The coefficient of frictions and masses of various blocks are shown. A force 2 N is applied on block B. What will be the acceleration of block B after 4 seconds $open parentheses g equals 10 text end text m divided by s to the power of 2 end exponent close parentheses 1.6 text end text m$

physics-General

parallel

The system shown in figure is released

The system shown in figure is released

physics-General

Two rough blocks A and B, A placed over B, move with acceleration $stack a with rightwards arrow on top A$ and $stack a with rightwards arrow on top B$ , velocities $stack v with rightwards arrow on top A$ and $stack V with rightwards arrow on top subscript B end subscript$ by the action of horizontal forces $stack F with rightwards arrow on top subscript A end subscript$ and $stack F with rightwards arrow on top subscript B end subscript$ respectively. When no friction exists between the blocks A and B at all times

Two rough blocks A and B, A placed over B, move with acceleration $stack a with rightwards arrow on top A$ and $stack a with rightwards arrow on top B$ , velocities $stack v with rightwards arrow on top A$ and $stack V with rightwards arrow on top subscript B end subscript$ by the action of horizontal forces $stack F with rightwards arrow on top subscript A end subscript$ and $stack F with rightwards arrow on top subscript B end subscript$ respectively. When no friction exists between the blocks A and B at all times

physics-General

In the figure, $m subscript A end subscript equals 2 text end text k g$ and $m subscript B end subscript equals 4 text end text k g$ . For what minimum value of F, A starts slipping over B: $open parentheses g equals 10 text end text m divided by s to the power of 2 end exponent close parentheses$

In the figure, $m subscript A end subscript equals 2 text end text k g$ and $m subscript B end subscript equals 4 text end text k g$ . For what minimum value of F, A starts slipping over B: $open parentheses g equals 10 text end text m divided by s to the power of 2 end exponent close parentheses$

physics-General

parallel

The coefficient of static friction between the two blocks is $mu$ and the table is smooth. The maximum horizontal force that can be applied to the block of mass M so that the blocks move together is

The coefficient of static friction between the two blocks is $mu$ and the table is smooth. The maximum horizontal force that can be applied to the block of mass M so that the blocks move together is

physics-General

Two blocks are moving under the action of external force F and 2F. The force of friction between the blocks so that they move without any relative sliding between them is :

Two blocks are moving under the action of external force F and 2F. The force of friction between the blocks so that they move without any relative sliding between them is :

physics-General

Two block of masses $m subscript 1 end subscript$ and $m subscript 2 end subscript$ are connected with a massless unstretched spring and placed over a plank moving with an acceleration 'a' as shown in figure. The coefficient of friction between the blocks and platform is $mu$ .

Two block of masses $m subscript 1 end subscript$ and $m subscript 2 end subscript$ are connected with a massless unstretched spring and placed over a plank moving with an acceleration 'a' as shown in figure. The coefficient of friction between the blocks and platform is $mu$ .

physics-General

parallel

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