Students know tools and machines are used to apply pushes and pulls (forces) to make things move.
The motion of objects can be observed and measured. As a basis for understanding this concept:
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Students know machines and living things convert stored energy to motion and heat.
Plan and conduct an investigation to provide evidence of the effects of balanced and unbalanced forces on the motion of an object.
Plan and conduct an investigation to compare the effects of different strengths or different directions of pushes and pulls on the motion of an object.