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Physics Chapter 3 : Topic 3
Air Resistance in Projectile Motion
1 / 30
In the absence of air resistance, the horizontal velocity of a projectile remains constant because:
Reasoning: According to Newton’s First Law, if no horizontal force acts on the projectile, its horizontal velocity remains constant.
2 / 30
When air resistance is present, the horizontal component of velocity of a projectile:
Reasoning: Air resistance acts opposite to motion, reducing the horizontal velocity throughout the flight.
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During the upward motion of a projectile with air resistance, the vertical velocity decreases because:
Reasoning: During ascent, both gravity and air resistance oppose the upward motion, causing a faster decrease in vertical velocity.
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Compared to ideal projectile motion, a projectile with air resistance reaches:
Reasoning: Air resistance and gravity both reduce upward speed, so the projectile reaches a lower maximum height.
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At the highest point of a projectile’s path with air resistance:
Reasoning: At maximum height, vertical velocity becomes zero, while horizontal velocity still exists (though reduced).
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During the downward motion of a projectile, air resistance acts:
Reasoning: Air resistance always opposes motion. Since the projectile moves downward, air resistance acts upward.
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During descent, the downward acceleration of a projectile with air resistance is:
Reasoning: Gravity acts downward while air resistance acts upward, reducing the net downward acceleration.
8 / 30
Which statement about the trajectory of a projectile with air resistance is correct?
Reasoning: Air resistance continuously changes both velocity components, so the path is no longer a perfect parabola.
9 / 30
Air resistance has the greatest effect on:
Reasoning: Air resistance opposes the instantaneous velocity, affecting both components.
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Compared to motion without air resistance, the time taken to reach maximum height is:
Reasoning: Gravity and air resistance both act downward during ascent, causing the projectile to slow down faster.
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The range of a projectile with air resistance is:
Reasoning: Reduced horizontal velocity and lower flight time both decrease the range.
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If two identical projectiles are fired with the same speed, one with air resistance and one without, which lands farther?
Reasoning: Air resistance reduces horizontal speed and flight distance.
13 / 30
Which component of velocity is directly affected by gravity?
Reasoning: Gravity acts vertically downward, directly changing only the vertical component.
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Which statement is true for the horizontal acceleration of a projectile with air resistance?
Reasoning: Air resistance produces a horizontal acceleration opposite to the horizontal velocity.
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Why is the range reduced when air resistance is considered?
Reasoning: Continuous reduction in horizontal velocity causes less horizontal displacement.
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Which graph best represents horizontal velocity versus time for projectile motion with air resistance?
Reasoning: Air resistance continuously slows the projectile, producing a decreasing horizontal velocity.
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During ascent, the magnitude of vertical acceleration with air resistance is:
Reasoning: Gravity and air resistance act in the same downward direction during ascent.
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During descent, the magnitude of vertical acceleration with air resistance is:
Reasoning: Air resistance opposes the downward motion, reducing net acceleration.
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A projectile launched in a vacuum and another launched in air have the same initial speed and angle. Which one reaches a greater height?
Reasoning: In a vacuum, only gravity acts; therefore, less energy is lost and a greater height is achieved.
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The horizontal velocity at landing with air resistance is:
Reasoning: Air resistance continuously reduces horizontal speed throughout the flight.
21 / 30
Why is projectile motion in real life not perfectly parabolic?
Reasoning: Air resistance alters both horizontal and vertical velocities.
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Which projectile is most affected by air resistance?
Reasoning: A feather has a large surface area and very small weight, making air resistance significant.
23 / 30
Which factor mainly causes a decrease in projectile range due to air resistance?
Reasoning: Both reduced horizontal speed and shorter flight time reduce the range.
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In the presence of air resistance, the projectile’s speed at the same height during ascent and descent is:
Reasoning: Energy is lost due to air resistance, so the speed during descent at the same height is smaller.
25 / 30
If air resistance suddenly became zero during flight, the projectile would then move:
Reasoning: Once air resistance disappears, only gravity acts, producing ideal projectile motion.
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The reduction in range due to air resistance is primarily because:
Reasoning: Air resistance exerts a force opposite to motion, continuously reducing horizontal momentum and hence range.
27 / 30
Which statement best summarizes the effect of air resistance on projectile motion?
Reasoning: Air resistance opposes motion in all directions, lowering both maximum height and range.
28 / 30
For a projectile moving through air, the actual landing point compared with the ideal landing point will be:
Reasoning: Air resistance reduces the horizontal distance traveled, bringing the landing point closer.
29 / 30
Which quantity is NOT reduced by air resistance?
Reasoning: Air resistance affects motion but does not change Earth’s gravitational acceleration.
30 / 30
A projectile experiences air resistance throughout its flight. The overall effect is that it:
Reasoning: Air resistance reduces both vertical and horizontal motion, decreasing maximum height and range.
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