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question_answer1)
Which one of the following statements is correct
A)
Rolling friction is greater than sliding friction done
clear
B)
Rolling friction is less than sliding friction done
clear
C)
Rolling friction is equal to sliding friction done
clear
D)
Rolling friction and sliding friction are same done
clear
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question_answer2)
The maximum speed that can be achieved without skidding by a car on a circular unbanked road of radius R and coefficient of static friction \[\mu \], is [NCERT 1990]
A)
\[\mu Rg\] done
clear
B)
\[Rg\sqrt{\mu }\] done
clear
C)
\[\mu \sqrt{Rg}\] done
clear
D)
\[\sqrt{\mu Rg}\] done
clear
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question_answer3)
A car is moving along a straight horizontal road with a speed \[{{v}_{0}}\]. If the coefficient of friction between the tyres and the road is \[\mu \], the shortest distance in which the car can be stopped is [MP PET 1985; BHU 2002]
A)
\[\frac{v_{0}^{2}}{2\mu g}\] done
clear
B)
\[\frac{{{v}_{0}}}{\mu g}\] done
clear
C)
\[{{\left( \frac{{{v}_{0}}}{\mu g} \right)}^{2}}\] done
clear
D)
\[\frac{{{v}_{0}}}{\mu }\] done
clear
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question_answer4)
A block of mass 5 kg is on a rough horizontal surface and is at rest. Now a force of 24 N is imparted to it with negligible impulse. If the coefficient of kinetic friction is 0.4 and \[g=9.8\,m/{{s}^{2}}\], then the acceleration of the block is
A)
\[0.26\,m/{{s}^{2}}\] done
clear
B)
\[0.39\,m/{{s}^{2}}\] done
clear
C)
\[0.69\,m/{{s}^{2}}\] done
clear
D)
\[0.88\,m/{{s}^{2}}\] done
clear
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question_answer5)
A body of mass 2 kg is being dragged with uniform velocity of 2 m/s on a rough horizontal plane. The coefficient of friction between the body and the surface is 0.20. The amount of heat generated in 5 sec is \[(J=4.2\,joule/cal\] and \[g=9.8\,m/{{s}^{2}})\] [MH CET (Med.) 2001]
A)
9.33 cal done
clear
B)
10.21 cal done
clear
C)
12.67 cal done
clear
D)
13.34 cal done
clear
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question_answer6)
Two carts of masses 200 kg and 300 kg on horizontal rails are pushed apart. Suppose the coefficient of friction between the carts and the rails are same. If the 200 kg cart travels a distance of 36 m and stops, then the distance travelled by the cart weighing 300 kg is [CPMT 1989; DPMT 2002]
A)
32 m done
clear
B)
24 m done
clear
C)
16 m done
clear
D)
12 m done
clear
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question_answer7)
A body B lies on a smooth horizontal table and another body A is placed on B. The coefficient of friction between A and B is \[\mu \]. What acceleration given to B will cause slipping to occur between A and B
A)
\[\mu g\] done
clear
B)
\[g/\mu \] done
clear
C)
\[\mu /g\] done
clear
D)
\[\sqrt{\mu g}\] done
clear
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question_answer8)
A 60 kg body is pushed with just enough force to start it moving across a floor and the same force continues to act afterwards. The coefficient of static friction and sliding friction are 0.5 and 0.4 respectively. The acceleration of the body is
A)
\[6\,m/{{s}^{2}}\] done
clear
B)
\[4.9\,m/{{s}^{2}}\] done
clear
C)
\[3.92\,m/{{s}^{2}}\] done
clear
D)
\[1\,m/{{s}^{2}}\] done
clear
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question_answer9)
A car turns a corner on a slippery road at a constant speed of \[10\,m/s\]. If the coefficient of friction is 0.5, the minimum radius of the arc in meter in which the car turns is
A)
20 done
clear
B)
10 done
clear
C)
5 done
clear
D)
4 done
clear
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question_answer10)
A motorcyclist of mass m is to negotiate a curve of radius r with a speed v. The minimum value of the coefficient of friction so that this negotiation may take place safely, is [Haryana CEE 1996]
A)
\[{{v}^{2}}rg\] done
clear
B)
\[\frac{{{v}^{2}}}{gr}\] done
clear
C)
\[\frac{gr}{{{v}^{2}}}\] done
clear
D)
\[\frac{g}{{{v}^{2}}r}\] done
clear
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question_answer11)
On a rough horizontal surface, a body of mass 2 kg is given a velocity of 10 m/s. If the coefficient of friction is 0.2 and \[g=10\,m/{{s}^{2}}\], the body will stop after covering a distance of [MP PMT 1999]
A)
10 m done
clear
B)
25 m done
clear
C)
50 m done
clear
D)
250 m done
clear
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question_answer12)
A block of mass 50 kg can slide on a rough horizontal surface. The coefficient of friction between the block and the surface is 0.6. The least force of pull acting at an angle of 30° to the upward drawn vertical which causes the block to just slide is [ISM Dhanbad 1994]
A)
29.43 N done
clear
B)
219.6 N done
clear
C)
21.96 N done
clear
D)
294.3 N done
clear
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question_answer13)
A body of 10 kg is acted by a force of 129.4 N if \[g=9.8\,m/{{\sec }^{2}}\]. The acceleration of the block is \[10\,m/{{s}^{2}}\]. What is the coefficient of kinetic friction [EAMCET 1994]
A)
0.03 done
clear
B)
0.01 done
clear
C)
0.30 done
clear
D)
0.25 done
clear
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question_answer14)
Assuming the coefficient of friction between the road and tyres of a car to be 0.5, the maximum speed with which the car can move round a curve of 40.0 m radius without slipping, if the road is unbanked, should be [AMU 1995]
A)
25 m/s done
clear
B)
19 m/s done
clear
C)
14 m/s done
clear
D)
11 m/s done
clear
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question_answer15)
Consider a car moving along a straight horizontal road with a speed of 72 km/h. If the coefficient of kinetic friction between the tyres and the road is 0.5, the shortest distance in which the car can be stopped is \[[g=10\,m{{s}^{-2}}]\] [CBSE PMT 1992]
A)
30 m done
clear
B)
40 m done
clear
C)
72 m done
clear
D)
20 m done
clear
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question_answer16)
A 500 kg horse pulls a cart of mass 1500 kg along a level road with an acceleration of \[1\,m{{s}^{-2}}\]. If the coefficient of sliding friction is 0.2, then the force exerted by the horse in forward direction is [SCRA 1998]
A)
3000 N done
clear
B)
4000 N done
clear
C)
5000 N done
clear
D)
6000 N done
clear
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question_answer17)
The maximum speed of a car on a road turn of radius 30m; if the coefficient of friction between the tyres and the road is 0.4; will be [MH CET (Med.) 1999]
A)
9.84 m/s done
clear
B)
10.84 m/s done
clear
C)
7.84 m/s done
clear
D)
5.84 m/s done
clear
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question_answer18)
A block of mass 50 kg slides over a horizontal distance of 1 m. If the coefficient of friction between their surfaces is 0.2, then work done against friction is [BHU 2001; CBSE PMT 1999, 2000; AIIMS 2000]
A)
98 J done
clear
B)
72J done
clear
C)
56 J done
clear
D)
34 J done
clear
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question_answer19)
On the horizontal surface of a truck (m = 0.6), a block of mass 1 kg is placed. If the truck is accelerating at the rate of 5m/sec2 then frictional force on the block will be [CBSE PMT 2001]
A)
5 N done
clear
B)
6 N done
clear
C)
5.88 N done
clear
D)
8 N done
clear
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question_answer20)
A vehicle of mass m is moving on a rough horizontal road with momentum P. If the coefficient of friction between the tyres and the road be m, then the stopping distance is [CBSE PMT 2001]
A)
\[\frac{P}{2\mu \,m\,g}\] done
clear
B)
\[\frac{{{P}^{2}}}{2\mu \,m\,g}\] done
clear
C)
\[\frac{P}{2\mu \,m{{\,}^{2}}g}\] done
clear
D)
\[\frac{{{P}^{2}}}{2\mu \,m{{\,}^{2}}g}\] done
clear
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question_answer21)
A body of weight 64 N is pushed with just enough force to start it moving across a horizontal floor and the same force continues to act afterwards. If the coefficients of static and dynamic friction are 0.6 and 0.4 respectively, the acceleration of the body will be (Acceleration due to gravity = g) [EAMCET 2001]
A)
\[\frac{g}{6.4}\] done
clear
B)
0.64 g done
clear
C)
\[\frac{g}{32}\] done
clear
D)
0.2 g done
clear
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question_answer22)
When a body is moving on a surface, the force of friction is called [MP PET 2002]
A)
Static friction done
clear
B)
Dynamic friction done
clear
C)
Limiting friction done
clear
D)
Rolling friction done
clear
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question_answer23)
A block of mass 10 kg is placed on a rough horizontal surface having coefficient of friction m = 0.5. If a horizontal force of 100 N is acting on it, then acceleration of the block will be [AIIMS 2002]
A)
\[0.5m/{{s}^{2}}\] done
clear
B)
\[5m/{{s}^{2}}\] done
clear
C)
\[10m/{{s}^{2}}\] done
clear
D)
\[15m/{{s}^{2}}\] done
clear
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question_answer24)
It is easier to roll a barrel than pull it along the road. This statement is [BVP 2003]
A)
False done
clear
B)
True done
clear
C)
Uncertain done
clear
D)
Not possible done
clear
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question_answer25)
A marble block of mass 2 kg lying on ice when given a velocity of 6 m/s is stopped by friction in 10s. Then the coefficient of friction is [AIEEE 2003]
A)
0.01 done
clear
B)
0.02 done
clear
C)
0.03 done
clear
D)
0.06 done
clear
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question_answer26)
A horizontal force of 129.4 N is applied on a 10 kg block which rests on a horizontal surface. If the coefficient of friction is 0.3, the acceleration should be
A)
\[9.8\,m/{{s}^{2}}\] done
clear
B)
\[10\,m/{{s}^{2}}\] done
clear
C)
\[12.6\,m/{{s}^{2}}\] done
clear
D)
\[19.6\,m/{{s}^{2}}\] done
clear
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question_answer27)
A 60 kg weight is dragged on a horizontal surface by a rope upto 2 metres. If coefficient of friction is \[\mu =0.5\], the angle of rope with the surface is 60° and \[g=9.8\,m/{{\sec }^{2}}\], then work done is [MP PET 1995]
A)
294 joules done
clear
B)
315 joules done
clear
C)
588 joules done
clear
D)
197 joules done
clear
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question_answer28)
A car having a mass of 1000 kg is moving at a speed of 30 metres/sec. Brakes are applied to bring the car to rest. If the frictional force between the tyres and the road surface is 5000 newtons, the car will come to rest in [MP PMT 1995]
A)
5 seconds done
clear
B)
10 seconds done
clear
C)
12 seconds done
clear
D)
6 seconds done
clear
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question_answer29)
If \[{{\mu }_{s}},\,{{\mu }_{k}}\] and \[{{\mu }_{r}}\] are coefficients of static friction, sliding friction and rolling friction, then [EAMCET (Engg.) 1995]
A)
\[{{\mu }_{s}}<{{\mu }_{k}}<{{\mu }_{r}}\] done
clear
B)
\[{{\mu }_{k}}<{{\mu }_{r}}<{{\mu }_{s}}\] done
clear
C)
\[{{\mu }_{r}}<{{\mu }_{k}}<{{\mu }_{s}}\] done
clear
D)
\[{{\mu }_{r}}={{\mu }_{k}}={{\mu }_{s}}\] done
clear
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question_answer30)
A body of mass 5kg rests on a rough horizontal surface of coefficient of friction 0.2. The body is pulled through a distance of 10m by a horizontal force of 25 N. The kinetic energy acquired by it is (g = 10 ms2) [EAMCET (Med.) 2000]
A)
330 J done
clear
B)
150 J done
clear
C)
100 J done
clear
D)
50 J done
clear
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question_answer31)
A motorcycle is travelling on a curved track of radius 500m. If the coefficient of friction between road and tyres is 0.5, the speed avoiding skidding will be [MH CET (Med.) 2001]
A)
50 m/s done
clear
B)
75 m/s done
clear
C)
25 m/s done
clear
D)
35 m/s done
clear
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question_answer32)
A fireman of mass 60 kg slides down a pole. He is pressing the pole with a force of 600 N. The coefficient of friction between the hands and the pole is 0.5, with what acceleration will the fireman slide down (g = 10 m/s2) [Pb. PMT 2002]
A)
1 m/s2 done
clear
B)
2.5 m/s2 done
clear
C)
10 m/s2 done
clear
D)
5 m/s2 done
clear
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question_answer33)
A block of mass \[M=5\,kg\] is resting on a rough horizontal surface for which the coefficient of friction is 0.2. When a force \[F=40\,\,N\] is applied, the acceleration of the block will be \[(g=10\,\,m/{{s}^{2}})\] [MP PMT 2004]
A)
\[5.73\,\,m/{{\sec }^{2}}\] done
clear
B)
\[8.0\,\,m/{{\sec }^{2}}\] done
clear
C)
\[3.17\,\,m/{{\sec }^{2}}\] done
clear
D)
\[10.0\,\,m/{{\sec }^{2}}\] done
clear
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question_answer34)
A body is moving along a rough horizontal surface with an initial velocity \[6\,\,m/s.\] If the body comes to rest after travelling 9 m, then the coefficient of sliding friction will be [BCECE 2004]
A)
0.4 done
clear
B)
0.2 done
clear
C)
0.6 done
clear
D)
0.8 done
clear
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question_answer35)
Consider a car moving on a straight road with a speed of 100 m/s. The distance at which car can be stopped is \[[{{\mu }_{k}}=0.5]\] [AIEEE 2005]
A)
100 m done
clear
B)
400 m done
clear
C)
800 m done
clear
D)
1000 m done
clear
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question_answer36)
A cylinder of 10 kg is sliding in a plane with an initial velocity of 10 m/s. If the coefficient of friction between the surface and cylinder is 0.5 then before stopping, it will cover. \[(g=10\,\,m/{{s}^{2}})\] [Pb. PMT 2004]
A)
2.5 m done
clear
B)
5 m done
clear
C)
7.5 m done
clear
D)
10 m done
clear
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