Friction Questions and Answers

A uniform ladder AB whose weight is 600 N and length 4 metres rests against a smooth vertical wall making with it an angle of 30 The other end rests on the ground surface Find the reactions given to the ladder by the wall and the floor and their inclination to the vertical when a man weighing 700 N climbs the ladder by a distance 1 5 m along the length of the ladder
Physics
Friction
A uniform ladder AB whose weight is 600 N and length 4 metres rests against a smooth vertical wall making with it an angle of 30 The other end rests on the ground surface Find the reactions given to the ladder by the wall and the floor and their inclination to the vertical when a man weighing 700 N climbs the ladder by a distance 1 5 m along the length of the ladder
16 The system is pushed by a force Fas the figure All surfaces are smooth except between B and C Coefficient of friction between B and C is u Minimum value of F to prevent block B from downward slipping is A B C 2m 1 3 T 3 2 5 2 F mg umg 2m 2 4 m 5 2 3 2 mg umg
Physics
Friction
16 The system is pushed by a force Fas the figure All surfaces are smooth except between B and C Coefficient of friction between B and C is u Minimum value of F to prevent block B from downward slipping is A B C 2m 1 3 T 3 2 5 2 F mg umg 2m 2 4 m 5 2 3 2 mg umg
Consider an ice skater gliding on ice holding bag of sand that is leaking straight down with respect to the moving skater As a result of the leaking sand the speed of the skater Group of answer choices Not enough information is given to decide does not change increases
Physics
Friction
Consider an ice skater gliding on ice holding bag of sand that is leaking straight down with respect to the moving skater As a result of the leaking sand the speed of the skater Group of answer choices Not enough information is given to decide does not change increases
2 In the figure shown a force of 40 N is applied on the plank of mass 5 kg A solid sphere of mass 3 kg rolls without slipping on plank 1 O 3 Choose the correct answer 1 Acceleration of plank is 20 13 40 13 m s 3 kg m s 5 kg 40 N 30 2 13 4 83 20 m s m s
Physics
Friction
2 In the figure shown a force of 40 N is applied on the plank of mass 5 kg A solid sphere of mass 3 kg rolls without slipping on plank 1 O 3 Choose the correct answer 1 Acceleration of plank is 20 13 40 13 m s 3 kg m s 5 kg 40 N 30 2 13 4 83 20 m s m s
A block of mass 1 kg is placed on the periphery of a rotating rough circular table of radius 50 cm as shown in the figure Angular velocity of the table is 4 rad s The minimum value of coefficient of friction between the contact such that there is n relative slipping is g 10 m s 0 8 1 6 0 4 0 2
Physics
Friction
A block of mass 1 kg is placed on the periphery of a rotating rough circular table of radius 50 cm as shown in the figure Angular velocity of the table is 4 rad s The minimum value of coefficient of friction between the contact such that there is n relative slipping is g 10 m s 0 8 1 6 0 4 0 2
Object 2 with mass 1 3kg is at rest on rough surface k 0 45 connected to a cord over massless frictionless pulley to object 1 with mass 10kg what is the magnitude of the system acceleration in m s N 6 30 9 50
Physics
Friction
Object 2 with mass 1 3kg is at rest on rough surface k 0 45 connected to a cord over massless frictionless pulley to object 1 with mass 10kg what is the magnitude of the system acceleration in m s N 6 30 9 50
A metallic sphere of mass 3 kg in air is held by a string so as to be completel immersed in a liquid of relative density 0 8 The relative density of metallic sphere is 10 The tension in the string is g 10 m s 2 O O c 18 7 N 42 5 N 32 7 N 27 6 N
Physics
Friction
A metallic sphere of mass 3 kg in air is held by a string so as to be completel immersed in a liquid of relative density 0 8 The relative density of metallic sphere is 10 The tension in the string is g 10 m s 2 O O c 18 7 N 42 5 N 32 7 N 27 6 N
A bus turns on an unbanked rough road having coefficient of friction 0 4 with a speed of 5 m s The minimum radius of the arc in which bus turns safely without skidding is Take g 10 m s 12 5 m 6 25 m 15 m 20 m
Physics
Friction
A bus turns on an unbanked rough road having coefficient of friction 0 4 with a speed of 5 m s The minimum radius of the arc in which bus turns safely without skidding is Take g 10 m s 12 5 m 6 25 m 15 m 20 m
A thin uniform stick of length and mass m is held horizontally with its end B hinged on the edge of a table Point A is suddenly released The acceleration of the centre of mass of the stick at the time of release is AIPMT Mains 2007 A 3 214 g 3 B 79 C 7 D 79 B
Physics
Friction
A thin uniform stick of length and mass m is held horizontally with its end B hinged on the edge of a table Point A is suddenly released The acceleration of the centre of mass of the stick at the time of release is AIPMT Mains 2007 A 3 214 g 3 B 79 C 7 D 79 B
R 9 Option D Consider a rope of mass 4m and length 4R on a fixed rough pulley of radius R as shown in the figure The rope is in equilibrium Length of vertical hanging parts is shown in the figure C B A 2R Torque of tension force about O on pulley is 4mgR Torque of normal force between rope and pulley on pulley about O is zero Rate this question Torque of friction force between rope and pulley on pulley about O is mgR Torque of friction force between rope and pulley on pulley about O is zero
Physics
Friction
R 9 Option D Consider a rope of mass 4m and length 4R on a fixed rough pulley of radius R as shown in the figure The rope is in equilibrium Length of vertical hanging parts is shown in the figure C B A 2R Torque of tension force about O on pulley is 4mgR Torque of normal force between rope and pulley on pulley about O is zero Rate this question Torque of friction force between rope and pulley on pulley about O is mgR Torque of friction force between rope and pulley on pulley about O is zero
012 10 0 points It takes 2 84 J of work to stretch a Hooke s law spring 5 58 cm from its unstressed length How much the extra work is required to stretch it an additional 13 5 cm Answer in units of J
Physics
Friction
012 10 0 points It takes 2 84 J of work to stretch a Hooke s law spring 5 58 cm from its unstressed length How much the extra work is required to stretch it an additional 13 5 cm Answer in units of J
1 2 Given graph is a plot of magnitude of normal limiting friction kinetic friction and static friction versus angle of inclination 0 for the coin lying on book 17 points are labeled with numbers The coin slips at a certain angle 0 The coefficient of static friction is 0 6 and the coefficient of kinetic friction is 0 4 0 is given by point A 14 4 B 15 Force 10 Jungle Book 14 13 15 16 17 Angle 0 The magnitude of the normal force on the coin from the book A 6 B 2 C 7 C 16 5 D 11 D 17
Physics
Friction
1 2 Given graph is a plot of magnitude of normal limiting friction kinetic friction and static friction versus angle of inclination 0 for the coin lying on book 17 points are labeled with numbers The coin slips at a certain angle 0 The coefficient of static friction is 0 6 and the coefficient of kinetic friction is 0 4 0 is given by point A 14 4 B 15 Force 10 Jungle Book 14 13 15 16 17 Angle 0 The magnitude of the normal force on the coin from the book A 6 B 2 C 7 C 16 5 D 11 D 17
For what value of P the point 1 1 2 3 and P 2 will form an isosceles right angled triangle Pfag farg 1 1 2 3 3 P 2 B 1 A 0 OA C 4 D 2
Physics
Friction
For what value of P the point 1 1 2 3 and P 2 will form an isosceles right angled triangle Pfag farg 1 1 2 3 3 P 2 B 1 A 0 OA C 4 D 2
A block of mass 1 kg is found to be moving with velocity 10j m sec on rough horizontal surfac xy plane u 0 2 which is also moving with velocity 101 m sec The smallest angle made by friction acting on block with positive x axis is given by a T Fill the value of 12 a in OMR sheet
Physics
Friction
A block of mass 1 kg is found to be moving with velocity 10j m sec on rough horizontal surfac xy plane u 0 2 which is also moving with velocity 101 m sec The smallest angle made by friction acting on block with positive x axis is given by a T Fill the value of 12 a in OMR sheet
Section 1 Straight Objective Type This section contains 5 multiple choice questions Each question has 4 choices a b c and d out of which ONLY ONE is correct 1 Three blocks A B C of weights 40N 30N 80N respectively are at rest on an inclined plane as shown in figure Determine the smallest value of coefficient of limiting friction u for which equilibrium of system is maintained a 0 1757 b 0 2757 c 0 5757 d 0 8757
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Friction
Section 1 Straight Objective Type This section contains 5 multiple choice questions Each question has 4 choices a b c and d out of which ONLY ONE is correct 1 Three blocks A B C of weights 40N 30N 80N respectively are at rest on an inclined plane as shown in figure Determine the smallest value of coefficient of limiting friction u for which equilibrium of system is maintained a 0 1757 b 0 2757 c 0 5757 d 0 8757
A circular tube of mass M is placed vertically on a horizontal surface as shown in the figure Two small spheres each of mass m just fit in the tube one released from the top If the tube looses contact with the ground at 60 then the value of M m Option A mim o B 2 11 13 M Rate this question
Physics
Friction
A circular tube of mass M is placed vertically on a horizontal surface as shown in the figure Two small spheres each of mass m just fit in the tube one released from the top If the tube looses contact with the ground at 60 then the value of M m Option A mim o B 2 11 13 M Rate this question