In an ideal wheel and axle system, R stands for radius of the wheel and r is the radius of the axle. The mechanical advantage is
A uniform rod PQ of length 1 m and mass 2 kg is pivoted at the end P. If a load of 14 N is placed at the centre of the rod , find the force that should be applied vertically upwards at Q to maintain the rod in equilibrium horizontally
Which of the following levers has the greatest mechanical advantage?
Which of the following graphs correctly represents the relationship between the load the velocity ratio of a machine?
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? [g = 10 ms-2]
A 20-toothed gear wheel drives a 60-toothed one. If the angular speed of the smaller wheel is 120revs-1 , the angular speed off the larger wheel is
3 revs -1
40 revs -1
360 revs -1
Which of the following graphs correctly describes the variation of the mechanical advantage with load for a simple machine whose velocity ratio is 3?
Answer: ESimple Machines
A uniform beam PQ if mass 20kg and length 5m is balanced as shown (Fig 8). A man of weight 800N stands at M such that QM = 2m. The reaction at P and Q respectively are (take g = 10m s-2)
300 N and 500 N
420 N and 580 N
220 N and 380 N
580 N and 420 N
380 N and 220 N
A mass of 2kg on a surface (u = 1/2) is connected to a second mass of 4kg over a frictionless pulley as shown in Fig 4. If the acceleration due to gravity is 9.8ms-2 then the masses will
accelerate at 4.9 ms-2
accelerate at 9.8 ms-2
accelerate at 19.6 ms-2
accelerate at 39.2 ms-2