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The Newton measures how hard and how long you have to push to get an object moving to a certain speed, or to get it to stop moving It measures force The other side of force is how much energy a moving ball, for example, transmits to your head when it hits you (Kids, don t try this at home No, not even with your kid brother) A sponge ball traveling at 10 meters per second won t hurt much A baseball, with more mass than sponge, thrown at the same speed, will hurt A lot It s not just the speed and mass of the object that matters It s how hard your head had to push against it to accelerate it in the opposite direction and stop it Not only that, but how quickly your head stops the ball makes a big di erence.



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Being a bit more sensible about catching baseballs, let s use a baseball mitt If someone throws the ball at you and you hold your hand sti y so it doesn t move, the ball will stop quickly and it will hurt If you let your hand travel with the ball a bit, cushioning the blow with the motion, it s much less painful In the rst case, you reverse-accelerate (decelerate) the ball all at once, which requires a lot of force in a small amount of time In the less painful catch, the same total amount of force is needed, but since it is spread out over more time there isn t as much force during each moment.

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It is seen from Taniguchi s Table 11 that a gear is a mechanical product that is known for transmitting motion and power Various processes such as machining, casting, forging, cold-roll forming, extrusion, drawing thread rolling, powder metallurgy and blanking processes are usually employed to manufacture gears Non-metallic gears however can be made by injection moulding and casting Figure 16 depicts the standard nomenclature for an involute spur gear The dimensional accuracy and surface finish required for the proper functioning of gear teeth depend on the gear s intended use Poor gear-tooth quality leads to inefficient energy transmission and frictional and wear characteristics Although roll-formed gears can be made with an accuracy that is sufficient for most applications, for example, automotive transmissions, machining however remains an unsurpassed process for gear manufacture as this process can be used to make all types and sizes of gears to a very high accuracy

It s like the di erence between the pain of pushing the sharp end of a thumb tack into your nger and what you feel from the at end on the nger doing the pushing Deceleration is just acceleration, but in the opposite direction of an object s current direction of travel..

Fig 16: The standard nomenclature for an involute spur gear [6]

Gears are manufactured by machining either by form cutting or by generating processes with the latter producing gears with a better surface roughness and a greater dimensional accuracy Finishing processes such as gear shaving and grinding further improve the surface roughness and the accuracy of the tooth profile The cutting tool used in form cutting is similar to a form-milling cutter as regards the shape of the space between the gear teeth (Figure 17) Cutting the gear blank around its periphery reproduces the gear-tooth shape The cutter is fed radially towards the centre of the blank to obtain the desired tooth depth and is then moved across the tooth face to obtain the required tooth width After cutting

p kg m/s Momentum is closely related to force. Where force is tied to the acceleration of the object, momentum uses its velocity. Momentum is de ned as mass times velocity, p m v.

a tooth, the cutter is withdrawn, the gear blank is indexed (rotated), and the cutter is made to cut another tooth The process continues until all the teeth are cut Each cutter is designed to cut a wide range and a number of teeth The precision of the form-cut tooth profile depends on the accuracy of the cutter and the machine and its stiffness Conventional horizontal milling machines are normally used to form cut gears The basic principle that is utilized in form cutting is shown in Figure 17 Because the cutter has a fixed geometry, form cutting can be used only to produce gear teeth that have a constant width, such as in spur or helical gears but not to cut bevel gear teeth

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