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