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Published byCorey Oliver Modified over 6 years ago
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DO NOW Hand in “Acceleration and Slope Lab” in your class bin.
Open notebooks to take short notes on forces and motion. Title notes “Forces change motion”
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Forces change motion Chapter 2.1
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Forces Force: A push or pull; changes the motion of an object
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Types of Forces Contact Force: one object pushes or pulls another object by touching it Gravity: force of attraction between two masses (Earth’s gravity) Friction: resists motion between two surfaces that are pressed together
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Balanced and Unbalanced Forces
Force is a vector: has both size and direction Net Force: the overall force acting on an object when all the forces are combined Balanced Forces: the net force is zero Unbalanced Forces: one force is greater than the other(s)
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Forces on Moving Objects
As long as forces are balanced, an object can move at a constant velocity. Ex: riding your bike at a constant speed. If you stop pedaling, eventually your bike will come to a stop An unbalanced force is needed to change an object’s motion.
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