Projectile Motion Quiz
Questions: 16 · 10 minutes
1. The same projectile is launched with the same speed and angle on Earth and on a world with weaker surface gravity. Neglect air resistance in both cases. What occurs under weaker gravity?
It reaches the same height and range because its launch velocity is unchanged.
It remains airborne for less time but travels farther horizontally.
It remains airborne longer and travels farther horizontally.
It falls faster because its initial vertical velocity is unchanged.
2. A ball is launched upward at an angle. At the highest point of its ideal trajectory, which statement is correct?
Both velocity components are zero.
Its vertical velocity is zero, but its horizontal velocity is not.
Its acceleration is momentarily zero.
Its horizontal velocity is zero, but its vertical velocity is not.
3. Two projectiles are launched from level ground at the same speed, one at 30° and the other at 60°. Under ideal conditions, how do their horizontal ranges compare?
The 30° launch travels twice as far.
The 60° launch travels twice as far.
Their ranges cannot be compared without knowing their masses.
They have the same horizontal range.
4. At one instant, an ideal projectile has a horizontal velocity component of 12 m/s and a vertical velocity component of 5 m/s downward. What is the magnitude of its velocity?
13 m/s
12 m/s
17 m/s
7 m/s
5. What shape does the path of an ideal projectile follow when plotted in horizontal and vertical coordinates?
A parabola
A straight line with changing speed
An ellipse
A circular arc
6. For the same two ideal launches at 30° and 60° with equal initial speed, which projectile reaches the greater maximum height?
The 30° projectile, because it moves horizontally faster
They reach the same height because their ranges are equal.
Their masses determine which rises higher.
The 60° projectile, because it has the larger initial vertical component
7. Near Earth's surface and with air resistance neglected, what is the projectile's acceleration during flight?
It points forward and decreases as the projectile rises.
It is zero at the top and downward elsewhere.
It is constant and vertically downward.
It is always tangent to the trajectory.
8. Two balls roll horizontally from the same table at different speeds at the same instant. Neglecting air resistance, which ball reaches the floor first?
The faster ball reaches the floor first.
They reach the floor at the same time.
The slower ball reaches the floor first.
The result depends only on their masses.
9. For an ideal projectile launched and landing at the same elevation with a fixed initial speed, which launch angle gives the maximum horizontal range?
45°
60°
30°
90°
10. Compared with an ideal calculation, what is a common effect of ordinary air resistance on a projectile's horizontal range?
It usually makes the range shorter by opposing the motion.
It always makes the range longer by increasing horizontal acceleration.
It has no effect on range, only on maximum height.
It keeps the projectile's horizontal speed constant during flight.
11. At the same instant, one ball is dropped from a cliff and another is launched horizontally from the same height. If air resistance is neglected, what happens?
The dropped ball lands first because it has no horizontal motion.
The heavier ball lands first, regardless of how it is released.
The launched ball lands first because its total initial speed is greater.
They land at the same time because their initial vertical motions are identical.
12. A projectile has an initial upward velocity component of 19.6 m/s. Using g = 9.8 m/s², how long does it take to reach its highest point?
4.0 seconds
1.0 second
2.0 seconds
9.8 seconds
13. In ideal projectile motion, how are the horizontal and vertical components of motion related?
They always have equal magnitudes throughout the flight.
The horizontal component determines the vertical acceleration.
The vertical component remains constant while the horizontal component accelerates.
They evolve independently while sharing the same elapsed time.
14. An ideal projectile launches and lands at the same elevation. If its launch speed is doubled while its angle stays fixed, how does its range change?
It remains unchanged.
It becomes four times as large.
It triples.
It doubles.
15. A projectile is launched at 10 m/s at an angle of 30° above the horizontal. What is its initial vertical velocity component?
10 m/s
8.7 m/s
5 m/s
2.5 m/s
16. A projectile is launched horizontally from a fixed height. If its horizontal launch speed is doubled, what happens to its flight time and horizontal range?
Both the flight time and range double.
The flight time stays the same, and the range doubles.
The flight time halves, and the range stays the same.
The flight time doubles, and the range becomes four times as large.