Mr Webber Stuff Flashcards
What is the Prefix value of a Picometer?
1 x 10*-12
What is the Prefix value for a Nanometer?
1 x 10*-9
What is the Prefix value for a Micrometer?
1 x 10*-6
What is the Prefix value for a Millimeter?
1 x 10*-3
What is the Prefix value for a kilometer?
1 x 10*3
What is the Prefix value for a Mega?
1 x 10*6
What is the Prefix value for a Giga?
1 x 10*9
What is the Prefix value for a Tera?
1 x 10*12
How do you find the Centre of Gravity?
- Hang a plug hole over a nail
- Punch some holes into a shape
- Hang the shape from the nail
- Trace with a pen the direction of the string
- Do this three times in different directions
What helps with Stability?
Wide base
Low centre of Gravity
What is the Weight equation?
W = m x g
What is the Moment equation?
Moment = Force x Perpendicular turning distance
What is the Principle of Moments?
For a system in equilibrium
- the sum of the clockwise moments EQUALS the sum of the anticlockwise moments
What is Laminar Flow?
- No mixing of layers
- Minimal Drag
- Streamline flow
What is Turbulent Flow?
- Mixing of layers
- Swirling currents
- Change in direction
- Energy is transferred to the surroundings
What is Upthrust?
Weight of fluid displaced
What is the Density equation?
m= V x Q
What is Work Done?
Is the force needed to move an object over a certain distance
What is Power?
Rate of energy released per second - Rate of energy transfer E/t
What is Efficiency?
Percentage of useful energy from total input.
What is the Efficiency Equation?
Useful energy in out/Total energy X 100
What is ANOTHER equation for Efficiency?
Useful power transferred/Total power supplied
What are the Trigonometry equations?
O A O
S H C H T A
What is the Kinetic Energy Equation?
KE = 0.5 x m x v*2
Using the KE equation what is the equation rearranged to V
V*2 = 2 x m x g x h
What is the GPE equation?
G = mgh
