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LSH PS Unit 2B

Forces

TermDefinition
Terminal Velocity When air resistance balances gravity and maximum velocity is reached
Force A push or pull
Balanced Forces Equal in magnitude and opposite in direction - net force is zero
Unbalanced Forces Not equal in magnitude or not opposite in direction - net force is greater than zero
Friction A force that works against motion when two surfaces are in contact
Static friction The counter force when two surfaces in contact have no motion relative to each other
Sliding friction The counter force when one surface slides over another surface
Rolling friction The counter force between the part of a wheel in contact with a surface and the surface
Air Resistance A force that opposes motion through the air; the sum of all the collisions of an object with gas molecules
Net Force The force remaining after adding or subtracting all forces acting on an object
Counter Force A force that opposes motion
Free Fall When a falling object is only affected by gravity
Microweld Interlocking microscopic ridges and valleys that cause friction