Unit 3.2 Let's Move It!
Area: Force & Motion
This Third Grade unit is the SECOND in the curriculum of four (4) units developed to address the Third Grade science standards of the Michigan Science Standards related to Force and Motion.
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A force is a push or a pull on an object. Credit is given for most knowledge about force as identified by Sir Isaac Newton, a famous scientist and mathematician. He developed three laws of motion, which are simplified as; When balanced forces occur an object is not moving. Gravity is the force from the Earth that pulls an object down. Force causes change in the speed of direction of the motion of an object. The greater the force placed on an object, the greater the change in motion. It is also important to understand that Static electricity is a form of electricity. When two objects are rubbed together the negative and the positive particles cause an attraction. Negative particles leave an object causing it to become positively charged. Natural magnets are found in some rocks which contain iron. Magnets have two poles; a north-seeking and a south-seeking pole. An electromagnet is made by constructing a battery, wire and an axle (nail).
Each force acts on one particular object and has both a strength and a 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. (Boundary: Qualitative and conceptual, but not quantitative addition of forces are used at this level.)
The patterns of an object’s motion in various situations can be observed and measured; when past motion exhibits a regular pattern, future motion can be predicted from it.