Interactive keypads were generally used for 4 to 6 questions per lesson both at the start of a topic;to assess initial student topic knowledge, and to allow student input for the sequence of topics; and during the topic as formative assessment to analyze and inform student learning and gauge the relative effectiveness of various strategies.
The Keypad assessment process also proved to be useful during lessons as a literacy tool to
develop scientific language and clarify areas of misconception. The response system keypads were also used to gauge student reaction to their own learning, and their response to the use of Keypads.
The Keypads were not used directly as a tool for summative assessment, instead the school
assessment programme, involving pen and paper tests, filled this role. Typically, a Keypad question is one where I know from experience there are
several common misconceptions.
For example the following question was asked after lessons on Newton’s laws of motion:
A boy is just able to push a heavy box at a steady speed across a flat concrete floor. Considering the boy applies the force as shown (see insert), which of the
following statements is correct?
1.The boy is applying a force just larger than the friction which acts on the box.
2. The boy is applying a force equal to the friction which acts on the box
3. The boy is applying a larger force to the box than it applies to him
4.The force the boy applies is just large enough to accelerate the box across the floor.
The poll results were discussed in order to:
1. Highlight the need to be careful when reading a question to ensure that they noted all the
important detail provided within the question, (exam technique), and
2. Highlight Newton’s laws to demonstrate how easily questions can be answered when time is taken to consider the physics involved.
The following discussion of the alternative answers is typical;
Answer 1: Is one of the most frequently chosen answers when not thought through by the student or carelessly read. It is true to start the box moving the force must be greater than the friction BUT the question clearly states that the boy is already pushing the box at a STEADY speed, i.e. a constant velocity because the floor is flat (horizontal).
Answer 2: Is the correct answer as the situation described by the questions perfectly demonstrates Newton’s first law, i.e. the forces must be balanced because the box is moving across the flat floor at a constant speed, therefore friction equals
applied force.
Answer 3: Cannot be correct because Newton’s third law says that there is always an EQUAL reaction force to any applied force
Answer 4: Makes no sense at all considering we are told the box moves a steady speed and, as such, it is NOT accelerating (changing velocity).
The ability to immediately discuss the reasons for the mistakes was noted as being very useful for a large number of the students.
Overall the response from nearly all students was very positive with a noted increase in individual participation and focus during lessons. The younger boys seemed to really enjoy
using the Keypads and often the first thing said on arrival at class was
“Are we using Keypads today?”
Post time: Apr-21-2022