27/03/2020Forces 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. From the diagram shown below, if the forces are in equilibrium, what is the value of tension T?70.71N100.00N241.42N50.00N2. Two forces each of 4N act on opposite sides of a rectangular plane as shown in the diagram below. Calculate the magnitude of the couple acting on the plane.0.8Nm1.6Nm6.4Nm3.2Nm3. A force of 10N, drags a mass of 10kg on a horizontal table with an acceleration of 0.2m/s². If the acceleration due to gravity is 10m/s², the co-efficient of friction between the moving mass and the table is0.020.200.080.804. 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 is4.0N6.4N0.4N64.0N5. In the diagram below, a lever of length 200m is used to lift a load of mass 180kg. The pivot at P is 20m from the load. What minimum force, F, must be applied at the end of the lever?18N9N20N200N6. Tireni stands on a spring scale placed in a lift. The lift descends at constant velocity. As a result, the scale reads a weightless than the weight of Tirenigreater than the weight of Tirenigreater than the weight of Tireni by 1kgthe same as the weight of Tireniof zero7. Find the resultant3N, N 75.2° E5N, N 65° W15N, S 43.4° W17N, S 61.9° E8. A boy pulls a nail from the wall with a string tied to the nail. The string is inclined at an angle of 60° to the wall. If the tension in the string is 4N, what is the effective force used in pulling the nail?4√3N8N4N2N2√3N9. A 4N force acting an angle to the horizontal has a horizontal component of 1N. The vertical component of the force is3.87N1N0.13N4N10. In the figure, MN is a light uniform meter rule pivoted at O, the 80cm mark. A load of 3.0kg is suspended on the rule at L, the 10cm mark. If the rule is kept in equilibrium by a string RP, fixed at P and attached to the rule at R, the 20cm mark, then the tension T in the string is.....70N60N34N30N35N11. When a box of mass 45kg is given an initial speed of 5m/s, it slides along a horizontal floor a distance of 3m before coming to rest. What is the co-efficient of the kinetic friction between the box and the floor? (g = 10m/s²)5/125/61/32/312. The term torque means...the resultant of several forces acting on a body in equilibriumthe moment of a couple about an axistwo coplanar forces at right angles to each otherthe equilibrant of two concurrent forcestwo equal and opposite forces whose lines of action do not coincide13. Two horizontal forces, 10N and 8N and another force, F inclined at 30° to the vertical acting as shown in the diagram below, keep the body P in equilibrium. The weight of the body is 2√3N/3√3N2√3N4√3N/314. 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?680J200J100J400J15. Calculate the magnitude of the force required to just move a 20kg object along a horizontal surface if the co-efficient of friction is 0.240.0N0.4N400.0N4.0N16. A body was slightly displaced from its equilibrium position. Which one of the following is a condition for its stable equilibriuman increase in the kinetic energy of the bodyan increase in the weight of the bodya decrease in the potential energy of the bodyan increase in the potential energy of the body17. In the diagram below, what is the value of W?15N30N5N10N20N18. 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?10Nm7Nm0Nm3Nm19. Which of the following statements are true about frictional force?I. it is always a disadvantageII. it is sometimes a disadvantageIII. it always exists where there is a relative motion of two bodies that are in contactIV. it is sometimes very usefulII & IVI & IVII & IIII & II20. Which of the following is in a neutral equilibrium?a cone resting on its slant edgea heavy weight suspended on a stringthe beam of a balance in usea heavy based table lamp21. An object of mass 80kg is pulled on a horizontal rough ground by a force of 500N. Find the coefficient of static friction. (g = 10m/s²)0.6250.400.801.0022. A cone in an unstable equilibrium has its potential energyunchangedoscillatingincreaseddecreased23. A boat is towed with a net force of 16000N acting at an angle of 60º to the water surface. If the boat moves with an acceleration of 20m/s², calculate its mass.400kg133.3kg533.3kg692.8kg24. A body rolls down a slope from a height of 100m. Its velocity at the foot of the slope is 20m/s. What percentage of its initial potential energy is converted into kinetic energy?15%35%20%40%25. A body of weight W rests on a smooth plane inclined at an angle of θ° to the horizontal. What is the resolved part of the weight in Newtons along the plane?WsecθWcosθWsinθWtanθ26 out of 25Time is Up!