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32 Cards in this Set

  • Front
  • Back
Quantity that has both number (magnitude) and direction (velocity)
Just a number (speed)
Adding Vectors
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
- Physical amount of material in that object
- "mass is the measure of inertia"
- more mass-- more inertia
- Force of gravity acting on an object
- w=mg
kgm/s2 = N
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
- All objects fall at the same rate
Force Concentration
More area- less pressure
Measurement for Pressure
- 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
Projectiles in Orbit
close to earth- 8 km/s
Earth's Curvature
8 km forward
5 m downward
-Resistance to change in motion
- depends on mass- measure of inertia