Physics 1 Flashcards
1
Q
- Name 5 scalars
- “MaTe Speed TiDe”
A
- Mass
- Temp
- Speed
- Time
- Density
2
Q
- Name 8 vectors
- “VeDiAcFo MagMoImTo”
A
- Velocity
- Displacement
- Accel
- Force
- Mag. Field
- Momentum
- Impulse
- Torque
3
Q
Think of force as…
A
- any influence capable of:
- causing a mass to accelerate
4
Q
Center of Mass equation
- What should you remember to keep in mind with these problems?
A
Cmass=(r1m1+r2m2….)/mtotal
- r=reference point
Hint: choose a reference point from which to measure each displacement vector
5
Q
- Constant net force causes WHAT acceleration?
- and therefore WHAT velocity?
A
-
CONSTANT acceleration
- therefore CHANGING velocity!!!
6
Q
- When you see “constant velocity” or “constant speed,” think? (5)**
A
- NO acceleration
- NO net force (Fnet=0)
- All forces sum to zero
- up forces=down forces, left=right, etc.
- NO change in direction
- The object is in EQUILIBRIUM!!!
7
Q
- When you see a LINEAR MOTION GRAPH, you’ll ask yourself these 6 things:
A
- What does the SLOPE represent?
- Is this slope (+) or (-)?
- It the slope….
- Constant (straight line) or
- Non-constant (curved line)?
- What is the value on the x-axis?
- Is the y value (+) or (-)
- aka are you above or below the x-axis?
- At t=0, do I expect the value on the y-axis to be:
- LARGE, or
- SMALL?
8
Q
- When I see the word “projectiles,” I will remember 7 things:
A
- Horizontal VELOCITY:
- never changes
- Horizontal ACCELERATION:
- is always =0
-
VERTICAL acceleration:
- is always 10 m/s2 downward
- Vertical BEHAVIOR
- is always symmetrical
- ex: upward trip=downward trip
- is always symmetrical
-
Time in air (Tair) depends on:
- VERTICAL COMPONENT of velocity ONLY!!
- Range depends on both:
- vertical AND horizontal components
- Time is always the same for both x and y components of the motion
9
Q
Law of Universal Gravitation formula
A
Fg=Gm1m2/r2
10
Q
- Fg=Gm1m2/r2
- gives WHAT?
A
- the force DUE to gravity
- NOT gravity itself!
11
Q
- Formula for GRAVITY (ITSELF!)
- aka “acceleration due to gravity”
- aka “strength of gravitational field”
A
g=Gm/r2
12
Q
- What are the 2 physics equations that could be used FOR FALLING OBJECTS?
A
- x=½at2
- V=√2gh
13
Q
Time in air equation
-
Tair=?
- this equation can ONLY be used to calculate what?
A
Tair=2V/g
- can only be used to calculate “round trip” times
- aka total time in air,V, must be vertical component of INITIAL velocity
14
Q
- At terminal velocity…
- What 2 things are happening?
- Give the formula for terminal velocity
A
- object has stopped accelerating
- forces of gravity and air resistance are BALANCED
Fair=mg
15
Q
Vavg=?
A
Vavg=(V1+V2)/2