Question
Asked Dec 17, 2019
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Draw a free-body diagram for each of the following objects:
(a) a projectile in motion in the presence of air resistance,
(b) a rocket leaving the launch pad with its engines operating,
and (c) an athlete running along a horizontal track.

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Expert Answer

Step 1

part (A)

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Projectile motion involves a body that is thrown from the Earth's surface which undergoes a curved path of motion under the influence of gravity. Consider a projectile launched at an angle 0 with respect to the horizon. Let m be the mass of the projectile.

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Step 2
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The free body diagram for the projectile motion is, ө Vx F mg air Fair is the air resistance. vz and vy are the components of the initial velocity in the x and y directions, respectively. Vis the initial velocity. gis the acceleration due to gravity

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Step 3
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Conclusion: The air resistance always opposes the force of gravity acting on the projectile. The velocity vector gives the direction of motion of the projectile.

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