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### 32 Cards in this Set

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 Vector Quantity that has both number (magnitude) and direction (velocity) Scalar Just a number (speed) Adding Vectors Head-to-Tail Subtracting Vectors -It is not communitive - Put the head pointing the opposite direction Multiplying a vector by a scalar Make that vector however many times longer depending on the number said(scalar) Components of a Vector - Vertical Component - Horizontal Component Pythagorean Thm a2 + b2 = c2 c2 = hypoteneuse Ball Launch Experiment - How far forward did it go? - How high was the cliff? - How fast was the car going when it hit the ground? Vertical and Horizontal Motion They are independent Projectile Motion Freefall in 2 or 3 D Horizontal Speed- no change Vertical Speed- affected by gravity Maximum Range -Any two angles that add up to 90* will hit the same spot Earth Orbit 8 km/s Galileo: Inertia - Resistance to change in motion - The property of objects to keep doing whatever they are doing Newton's 1st Law - Objects in motion remain in motion at a constant velocity - objects in rest remain at rest - Unless acted upon by a net total outside force that it not from that objects itself Mass - Physical amount of material in that object - "mass is the measure of inertia" - more mass-- more inertia Weight - Force of gravity acting on an object - w=mg Newton N kgm/s2 = N Equilibrium When the net force is 0 Force Diagrams - Draw only one object - Draw forces on that object as vectors - Only draw forces that act ON the object Net force - Sum of all of the forces on an object - Fnet= 0 - no change in motion -rest, constant velocity Newton's 2nd Law - More mass-- more resistance to change in motion (more inertia) - apply more net force- more change in motion a= f/m Newton's 2nd Law for gravity -Constant force produces constant acc Fgrav=magrav w=mg Freefall agrav=Fgrav/m =w/m =mg/m =g - All objects fall at the same rate Pressure Force Concentration P=F/A More area- less pressure (Pa) Pascals Measurement for Pressure Friction - Force that opposes motion - caused by intermolecular snagging Pressure and Friction Pressure, Surface Area Book on side vs. Book on spine: Same total friciton Wide tires: No change in traction (friction) Air Resistance - Friction with air - Depends on speed, surface area Fnet 0, Acc 0 Terminal Velocity - Reaches its final speed, and continues going at the same rate - Reaches equilibrium - Morse massive- faster terminal velocity and also hits the ground first - Single- Reaches terminal velocity first Satellites Projectiles in Orbit close to earth- 8 km/s Earth's Curvature 8 km forward 5 m downward Inertia -Resistance to change in motion - depends on mass- measure of inertia