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Question 21 ( Two students did an experiment where they exploded three masses, initially connected together, as shown in the diagram. Marks Before they analysed their results, each student made a hypothesis about the result. Tom's hypothesis: The results will show that both momentum and kinetic energy will be conserved in this process. My evidence will be that the vector sum of each after the explosion will be a closed figure. Carol's hypothesis: Momentum will be conserved in this process, but kinetic energy will not. My evidence will be a closed vector diagram for the momentum, but an open vector diagram for the energy. In terms of principles of physics involved, evaluate the two students' comments and, if incorrect, provide the correct statement. 3

          Question 21 (
Two students did an experiment where they exploded three masses, initially connected
together, as shown in the diagram.
Marks
Before they analysed their results, each student made a hypothesis about the result.
Tom's hypothesis: The results will show that both momentum and kinetic energy
will be conserved in this process. My evidence will be that the vector sum of each
after the explosion will be a closed figure.
Carol's hypothesis: Momentum will be conserved in this process, but kinetic
energy will not. My evidence will be a closed vector diagram for the momentum,
but an open vector diagram for the energy.
In terms of principles of physics involved, evaluate the two students' comments and, if
incorrect, provide the correct statement.
3

Question 21 (
Two students did an experiment where they exploded three masses, initially connected
together, as shown in the diagram.
Marks
Before they analysed their results, each student made a hypothesis about the result.
Tom's hypothesis: The results will show that both momentum and kinetic energy
will be conserved in this process. My evidence will be that the vector sum of each
after the explosion will be a closed figure.
Carol's hypothesis: Momentum will be conserved in this process, but kinetic
energy will not. My evidence will be a closed vector diagram for the momentum,
but an open vector diagram for the energy.
In terms of principles of physics involved, evaluate the two students' comments and, if
incorrect, provide the correct statement.
3

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