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Something track runners could use to improve performance are running spikes, these help to create less friction which is helping them to get their feet off the ground faster and generate force faster. Another example could be starting blocks, these give the runners something to push off on at the start of the race giving them a boost to the force they can initially create and start with.

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Friction plays the role of acting in the opposite direction of the force the runner is creating and in the same direction as the movement. Friction can be when the runners shoes are hitting the ground.

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Weight can affect this sport because if you if are too heavy you will be slower than those who don't weigh as much. I would say that weighing less is ideal but that is not always the case. Take Tcarr for example, he is about 75 pounds heavier than Keagan but still faster.

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An example of force being applied in track is the force of pushing down on the track with your leg muscles as you are running.

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This runner is pushing on the ground as the ground pushes him back up because he is applying force

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These runners are at rest right now and will remain at rest until they hear the gun and use force to push off of the blocks and begin their acceleration

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The acceleration of the runner is starting to come to a decline because she has reached her stopping point and is no longer applying force.