27/03/2020 Forces and Moments(Senior Class Physics Study by Topics) 0Comments by Gate Academy Welcome to your Forces and Moments(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. A body of mass 4kg is on the point of slipping down a plane which is inclined at 30° to the horizontal. What force, parallel to the plane, will just move it up the plane? (g = 10m/s²)40N5N80N8N2. The masses are hanging from a light rod 1.0m long as shown in the diagram below. To keep the rod horizontal, the mass of X must be3.0kg1.0kg1.5kg2.0kg3. Which of the following types of motion is produced by a couple?rotationaloscillatoryrandomtranslational4. Two forces 3N and 4N act on a body in directions due north and due east respectively. Calculate their equilibrant.5N, 37° north of east7N, 37° south of west5N, 53° east of north7N, 37° west of north5N, 53° west of south5. Which of the following statements about friction is NOT correct?the force of kinetic friction is less than that of static frictionthe force of kinetic friction between two surfaces is independent of the areas in contact provided the normal reaction is unchangedthe angle of friction is the angle between the normal reaction and the force of frictionfriction may be reduced by lubricationthe force of rolling friction between two surfaces is less than the force of sliding friction6. In the diagram below, what is the value of W?30N10N20N5N15N7. In the diagram below, the values of the vertically suspended weight W and the angle X are:4kgf, 36.9°8kgf, 73.8°2kgf, 30.9°12kgf, 106.2°6kgf, 53.1°8. The value of T in the figure below is11.8N20N40N10N9. Two forces whose resultant is 100N, are at right angles to each other. If one of them makes an angle of 30° with the resultant, determine its magnitude8.66N57.7N86.6N50N10. A metal block of mass 5kg lies on a rough horizontal platform. If a horizontal force of 8N is applied to the block through its centre of mass just slides the block on the platform, then the co-efficient of limiting friction between the block and the platform is0.161.602.000.630.8011. An object is acted upon by a system of parallel forces causing the object to be in static equilibrium. Which of the following statements is NOT correct?the resultant of the parallel forces is zerothe algebraic sum of all the moments of the forces is zerothe sum of the forces in one direction must be equal to the sum of the forces in the opposite directionall the parallel forces must be equal in magnitude and direction12. A block of mass 2kg resting on a smooth horizontal plane is acted upon simultaneously by two forces, 10N due North and 10N due East. The magnitude of the acceleration produced by the forces on the block is20.00m/s²0.10m/s²14.10m/s²10.00m/s²7.07m/s²13. The co-efficient of static friction between a 40kg crate and a concrete surface is 0.25. Find the magnitude of the minimum force needed to keep the crate stationary on the concrete base inclined at 45° to the horizontal (g = 10m/s²)283N212N300N400N14. A wooden block of weight 16N is placed on a rough surface. If the co-efficient of friction between both surfaces is 0.25, the least horizontal force required to move the block is0.4N4.0N6.4N64.0N15. The centre of gravity of a uniform triangular lamina is the point of intersection ofthe mediansthe bisectors of its three sidesthe perpendicular bisectors of its sidesall of the abovethe altitudes16. A body of mass 2kg is placed on a rough inclined plane whose angle of inclination is 30º. Find the resultant force acting down the slope and the acceleration if a frictional force of 5N acts between the body and the inclined surface15N, 0.5m/s²5N, 2.5m/s²20N, 1.5m/s²10N, 2.5m/s²17. A force of 5N acts at a point Y on a rod XYZ as shown in the figure below. If XY is 2m, what is the moment of the force about point X?7Nm0Nm3Nm10Nm18. A block of mass M is held in equilibrium against a vertical wall by a horizontal force. If the co-efficient of friction between the block and the wall is μ, the minimum value of the horizontal force is(1 - μ)mg(1 + μ)mgμmgmg/μ19. A body of mass 10kg on a smooth inclined plane is connected over a smooth pulley to a mass of 15kg as shown. The acceleration of the system in terms of g is 3g/4g/22g/58g/25g20. In the figure below, the three forces F_{1 , }F_{2} & F_{3} acting at O are in equilibrium. If the magnitude of F_{1} is 10.0N and the magnitude of F_{2} is 5.0N; find the magnitude of F_{3}26.4N15.0N10.0N13.2N21. A box of mass 40kg is being dragged along the floor by a rope inclined at 60° to the horizontal. The frictional force between the box and the floor is 100N and the tension on the rope is 300N. How much work is done in dragging the box through a distance of 4m?680J100J200J400J22. In the diagram below, MN is perpendicular ON and MP. What is the difference between the moment about N of the force 20N, applied along MP and its moment about O?0Nm4Nm8Nm6Nm2Nm23. Find the tension T in the figure below if the system is in equilibrium. 300N/√3100N/√3100N200N/√324. The figure below shows a see-saw which is exactly in balance. The weight of the people sitting on it are 50kg, Xkg and 15kg as shown. They sit at distance of 1.5m, 1.5m and 2m from the pivot respectively. The value of X is70303526.5impossible to find25. When three coplanar non parallel forces are in equilibriumI. they can be represented in magnitude and direction by the three sides of a triangle triangle taken in orderII. their lines of action meet at a point III. the magnitude of any one force equals the magnitude of the resultant of the other twoIV. any one force is the equilibrant of the other two.Which of the statements above are correct?I, II, III & IVI, III & IV onlyII, III & IV onlyI & II onlyII & III only26 out of 25Time is Up!