3 โจทย์ข้อสอบ Student Pilot วิชาฟิสิกส์
SP TG Physics
1. An object that’s moving with constant speed travels once around a circular path. True statements about this motion include which of the following?
I. The displacement is zero.
II. The average speed is zero.
III. The acceleration is zero.
A. I only
B. I and II only
C. I and III only
D. III only
E. II and III only
Correct Answer: A
Explanation:
Traveling once around a circular path means that the final
position coincides with the initial position. Therefore, the displacement is
zero. The average speed, which is total distance traveled
divided by elapsed time, cannot be zero. And since the velocity changed
(because its direction changed), there was a nonzero acceleration. Therefore,
only I is true.
2. At time t = t1, an object’s velocity is given by the vector v1 shown below.
A short time later, at t = t2,
the object’s velocity is the vector v2.
If v1 and v2 have
the same magnitude, which one of the following vectors best illustrates the
object’s average acceleration between t = t1 and t = t2 ?
A. 
B. 
C. 
D. 
E. 
Correct Answer: C
Explanation:
By definition,
= ∆v / ∆t. We
determine ∆v = v2 – v1 = v2 +
(–v1) geometrically as follows:
Since ∆t is a positive scalar, the direction
of is the same as the direction
of ∆v, which is displayed above; C is best.
3. Which of the following must always be true?
I. If an object’s acceleration is constant, then it must
move in a straight line.
II. If an object’s acceleration is zero, then its speed must
remain constant.
III. If an object’s speed remains constant, then its
acceleration must be zero.
A. I and II only
B. I and III only
C. II only
D. III only
E. II and III only
Correct Answer: C
Explanation:
I is false since a projectile experiencing only the constant
acceleration due to gravity can travel in a parabolic trajectory. II is true:
Zero acceleration means no change in speed (or direction). III is false: An
object whose speed remains constant but whose velocity vector is changing
direction is accelerating.
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3 โจทย์ข้อสอบ Student Pilot วิชาฟิสิกส์ SP TG Physics
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