Fig. 2. Annotated Excerpt from Human-Human Spoken Tutoring Corpus
PHYSICS PROBLEM (TYPED): The sun pulls on the earth with the force of
gravity and causes the earth
to move in orbit around the sun. Does the earth pull equally on the
sun? Defend your answer.
STUDENT ESSAY (TYPED): No. Both objects apply a force on the other. The
sun applies more force because it is causing the earth to have more
acceleration.
DIALOGUE (SPOKEN): ... excerpt at
4.3 minutes into dialogue ...
(play entire dialogue: wav
mp3)
(wav mp3) TUTOR5: The only
thing asked is about the force, whether the force of earth pulls
equally on the sun or not. That's the only question.
(wav mp3) STUDENT5: Well I
think it does but I don't know why. I do-don't I- do they move in the
same direction? I do-don't (NEGATIVE)
(wav mp3) TUTOR6: You see,
against- you see, they don't have to move. If a force acts on a body-
(wav mp3) STUDENT6: it- (POSITIVE)
(wav mp3) TUTOR7: it does not
mean that uh uh I mean it will um-
(wav mp3) STUDENT7: If two
forces um apply- if two forces react on each other then the force is
equal. It's the Newtons third law. (POSITIVE)
(wav mp3) TUTOR8: Um you see
the uh- actually in this case the motion is there but it is a little
more complicated motion. This is orbital motion.
(wav mp3) STUDENT8: mm-hm (NEUTRAL)
Fig.
3. Annotated Excerpt from Human-Computer Spoken Tutoring Corpus
PHYSICS PROBLEM (TYPED): An airplane flying horizontally drops a packet
when it is directly above the center of a swimming pool. Does the
packet hit that spot? Explain.
STUDENT ESSAY (TYPED): No, the packet is still being affected by the
force of the airplane flying horizontally, so the packet will also move
horizontally, slightly as it falls downward. This will cause the packet
to hit a spot that is no directly in the center of the pool.
DIALOGUE (SPOKEN): ... excerpt at
18.6 minutes into dialogue ...
(play entire dialogue: wav
mp3)
(wav mp3) ITSPOKE22: Ok,
let's consider how forces in the vertical direction affect the motion
of a body in a horizontal direction in a different scenario. Say an
apple falls from a tree. What force(s) are acting on the apple as it
falls?
(wav mp3) STUDENT19: gravity
(ASR: gravity) (NEGATIVE)
(wav mp3) ITSPOKE23:
Yeah. Are there any other forces acting on the apple as it falls?
(wav mp3) STUDENT20: no (ASR:
no) (NEGATIVE)
(wav mp3) ITSPOKE24:
Fine. The only force acting on the apple as it falls to the earth
is the earth's gravitational force. In which direction does
gravitational force act?
(wav mp3) STUDENT21: down
(ASR: down) (POSITIVE)
(wav mp3) ITSPOKE25:
Yep. Therefore, what is the magnitude of this gravitational force
in the horizontal direction?
(wav mp3) STUDENT22: in the
direction of the airplane (ASR: it met the direction that of the the
airplane moon) (NEUTRAL)