SC15.3.1

Science (2015) Grade(s): 3

SC15.3.1

Plan and carry out an experiment to determine the effects of balanced and unbalanced forces on the motion of an object using one variable at a time, including number, size, direction, speed, position, friction, or air resistance (e.g., balanced forces pushing from both sides on an object, such as a box, producing no motion; unbalanced force on one side of an object, such as a ball, producing motion), and communicate these findings graphically.

Unpacked Content

Scientific and Engineering Practices

Planning and Carrying out Investigations

Crosscutting Concepts

Cause and Effect

Knowledge

Students know:
  • Each force acts on one particular object and has both strength and direction.
  • An object at rest typically has multiple forces acting on it, but they add to give zero net force on the object.
  • Forces that do not sum to zero can cause changes in the object's speed or direction of motion.
  • Objects in contact exert forces on each other.

Skills

Students are able to:
  • Collaboratively plan an experiment to determine the effects of balanced and unbalanced forces on the motion of an object using one variable at a time.
  • Carry out an experiment to determine the effects of balanced and unbalanced forces on the motion of an object using one variable at a time.
  • Collect and record data from experiment.
  • Describe how the investigation plan addresses the purpose of the investigation.
  • Communicate findings graphically.

Understanding

Students understand that:
  • Cause and effect relationships provide evidence when investigating balanced and unbalanced forces.

Vocabulary

  • Experiment
  • Variable
  • Motion
  • Force (push and pull)
  • Balanced forces
  • Unbalanced forces
  • Cause and effect
  • Number
  • Size
  • Direction
  • Position
  • Friction
  • Air resistance
  • Communicate
  • Graphically
  • Net force
  • Sum
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