By H. J. P. Keighley (auth.)
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4(b) the object will fall when released. The stance adopted in karate ensures a strong position: the position of the feet gives in effect a large base area and the bending of the knees lowers the centre of gravity. 4 In (a) the moment about X of the weight tends to turn the body anticlockwise. In (b) the moment about X tends to turn the body clockwise and the body falls over. 4. 2 Work, Energy and Power (a) Work is energy transfer, and may be calculated from the equation work = force x distance moved in direction of force.
The top of it will shorten and is in compression. The underside will get longer and so is in tension. (c) Centre of Gravity (Centre of Mass) The centre of gravity of a body is the point through which its whole weight may be considered to act. ) (d) Types of Equilibrium A body is said to be in stable equilibrium if when given a small displacement and then released it returns to its original position. A body is said to be in unstable equilibrium if when given a small displacement and then released it moves further from its original position.
5, the work got out of the machine is equal to the potential energy gained by the load and the work put into the machine is the work done by the effort. If the load rises 1 m then each of the strings A, Band C must shorten by 1 m and the effort moves 3 m. A 8 C (c) The Inclined Plane When the load is lifted a vertical height h (Fig. 5 A simple pulley system. 6 An inclined plane. (d) Gears The ratio between the number of rotations of each of the two intermeshed gears is given by number of rotations of driving gear number of rotations of driven gear = number of teeth on driven gear number of teeth on driving gear 41 (e) Wheel and Axle The steering wheel on a car provides a good example of the wheel and axle principle.