Module: Kinetic Energy
DCI: PS3.A (A2) Motion energy is properly called kinetic
energy. It is proportional to the mass
of the moving object and grows with the square of its speed.
PE: MS-PS3-1 Construct and interpret graphical displays of data to
describe the relationships of kinetic energy to the mass of an object and the
speed of an object.
[Clarification
Statement: Emphasis is on descriptive relationships between kinetic energy and
mass separately from kinetic energy and speed. Examples could include riding a
bicycle at different speeds, rolling different sizes of rocks downhill, and
getting hit by a wiffle ball
versus a tennis ball.]
The ideas in this standard are:
- motion energy is called kinetic energy.
- kinetic energy is proportional to the mass of a moving object.
- kinetic energy grows with the square of the speed of a moving object.
We will have to provide graphs with information about mass, kinetic, energy, and/or speed and have students make generalizations about the relationships between these variables.
Possible Question Starters:
"An object's kinetic energy is proportional to which of its properties?"
correct answer - mass and speed
incorrect answer - acceleration and diameter
"A graph showing the kinetic energy and speed of a moving object are provided.
Which of the following can be concluded from the graph?"
correct answer - kinetic energy increases as speed increases
correct answer - kinetic energy increases as speed increases
incorrect answer - kinetic energy only changes when speed changes
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