3 โจทย์ข้อสอบ Student Pilot วิชาฟิสิกส์ SP TG Physics

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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