Question

World-class sprinters can accelerate out of the starting blocks with an acceleration that is nearly horizontal and has magnitude $15 \mathrm{~m} / \mathrm{s}^{2} .$ How much horizontal force must a $55 \mathrm{~kg}$ sprinter exert on the starting blocks to produce this acceleration? Which object exerts the force that propels the sprinter: the blocks or the sprinter herself?

Name: Problem 21, Chapter 4: University Physics with Modern Physics
Uploaded: 2021-01-29T03:45:25-08:00
Duration: 2 min 15 s
Channel: Bianca Gualtieri
Description: World-class sprinters can accelerate out of the starting blocks with an acceleration that is nearly horizontal and has magnitude 15 m / s^2 . How much horizontal force must a 55 kg sprinter exert on the starting blocks to produce this acceleration? Which object exerts the force that propels the sprinter: the blocks or the sprinter herself?

   World-class sprinters can accelerate out of the starting blocks with an acceleration that is nearly horizontal and has magnitude $15 \mathrm{~m} / \mathrm{s}^{2} .$ How much horizontal force must a $55 \mathrm{~kg}$ sprinter exert on the starting blocks to produce this acceleration? Which object exerts the force that propels the sprinter: the blocks or the sprinter herself?

University Physics with Modern Physics

Roger A. Freedman,… 15th Edition

Chapter 4, Problem 21

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Solved by Expert Bianca Gualtieri

01/29/2021

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World-class sprinters can accelerate out of the starting blocks with an acceleration that is nearly horizontal and has magnitude $15 \mathrm{~m} / \mathrm{s}^{2} .$ How much horizontal force must a $55 \mathrm{~kg}$ sprinter exert on the starting blocks to produce this acceleration? Which object exerts the force that propels the sprinter: the blocks or the sprinter herself?

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Key Concepts

Newton's Second Law

Newton's Second Law states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration (F=ma). This concept is used to calculate the force required to produce a given acceleration, as in determining the horizontal force a sprinter must apply given their mass and the acceleration needed from the starting blocks.

Newton's Third Law

Newton's Third Law states that for every action, there is an equal and opposite reaction. In the context of starting a sprint, while the sprinter applies a force on the blocks, the blocks exert an equal and opposite force on the sprinter, which propels her forward.

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