torque is a measurement of the force which causes something to rotate around a point think of a wrench and a nut which has seized up using a small wrench is very hard to free the nut using a long wrench will make it much easier that's because of torque if we use a 30 centimeter wrench and applied 90 newtons of force we have 0.3 meters multiplied by 90 newtons which gives us 27 newton meters of torque however if we applied the same 90 newtons of force to a wrench that was 60 centimeters long then we would
get 0.6 meters multiplied by 90 newtons which gives us 54 newton meters so from this simple formula you can see we have more force acting on the nut by using a longer wrench essentially we're using a larger circle to turn a smaller circle by changing the size we change the speed and the torque a low gear provides low speed but high torque a high gear gives high speed but low torque if you have ever ridden a bike you'll know it's very difficult to start pedaling in a high gear so we need to start in a
low gear to get the bike moving at a certain point our legs are spinning very fast but we can't go any faster so we need to change to another higher gear once we reach a steep hill we need to move to a lower gear the same with a car we start in our lowest gear number and work our way up as the vehicle increases in speed then we change down as we drive up a hill okay that's it for this video but to continue learning about mechanical and automotive engineering check out one of the videos
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