| Item |
Possible Points |
Scoring Criteria |
| 1 |
1 |
1 pt for a statement such as:
- more washers in the bucket
- more force
- more washers
- or gives actual quantities that show the correct trend
|
| 2a |
1 |
1 pt for a statement such as:
- more washers used when truck is heavier
- more force
- more washers
- more pull
- or gives actual quantities that show the correct trend
|
| 2b |
1 |
1 pt for a statement such as:
- less washers used when truck is lighter
- less force
- less washers
- less pull
- or gives actual quantities that show the correct trend
|
| 3 |
0 |
A: Response describes a design
for the experiment, but does not show that the student actually
carried out the experiment at this stage.
B: Response indicates that the student actually performed
the experiment (and hence implicitly designed it).
If it is not clear whether Option A or B is appropriate,
use whichever option yields the highest score. The default
is Option A.
C: The response is blank, incomprehensible
or the response only gives a conclusion.
|
| 3 |
3 |
A: response describes a design.
Then score as follows:
1 pt: a reasonable part, or step, of running the experiment
is mentioned, not including counting washers or repeating the
steps across levels. There should be some explicit statement
which cues this, such as "set the plane on the ladder" or "pull
string over pulley."
1 pt: says to count the number of washers on the hook. This
may also be implicit, if the actual counts of washers are mentioned,
or statements like "more than," "less than," and "in between"
are used.
1 pt: mentions doing the same operations for at least two
levels of the ladder.
B: student actually performed the experiment.
Then score as follows:
1 pt: something is said about the procedures used.
1 pt: the number of washers in the bucket are counted.
1 pt: repeats the operations for at least two levels.
C: The response is blank, incomprehensible
or only gives a conclusion.
Zero points.
|
| 4 |
3 |
1 pt: Includes at least 2 levels of the ladder.
1 pt: Provides a number of washers for every level of the ladder
included.
1 pt: The number of washers increases as the level increases.
|
