Flashcards in Mechanical Deck (45):

1

## Displacement

### final position - initial position

2

## Velocity

### average velocity = (displacement / change in time)

3

## Speed

### average speed = (total distance travelled / change in time)

4

## Acceleration

### average acceleration = (change in velocity / change in time)

5

## Projectile Motion

### vertical velocity = (original vertical velocity - (g x time))

6

## Rotational Kinematics

###
increasing the radius increases the linear speed

linear speed = radius (in radians) x rotational speed

7

## Force

###
a push or pull on an object

force = mass x acceleration

8

## Weight

### weight = mass x acceleration due to gravity (-9.8 m/s^2 or -32.2 ft/s^2)

9

## Rotational Kinetics

### torque = radius x force

10

## Work

###
the transfer of energy from one object to another

work = force x displacement

(for 2-dimensions) work = force x displacement x cos(angle between displacement and force)

11

## Energy

### the ability of a body to do work on another object

12

## Kinetic Energy

### energy an object has by virtue of its motion

13

## Gravitational Potential Energy

###
energy by virtue of an object's height

gravitational potential energy = weight x height

14

## Elastic Potential Energy

### energy stored in compression or tension

15

## Power

###
the rate of work

power = (work / time)

16

## Mechanical Advantage

###
the amount of change a simple machine provides to the magnitude of a force

mechanical advantage = (output force / input force) = (input distance / output distance)

17

## Inclined Plane

### mechanical advantage = (slant rise / rise)

18

## Wedge

### mechanical advantage = (length / width)

19

## Screw

### mechanical advantage = (circumference / length between crests)

20

## Lever

### mechanical advantage = (effort distance / resistance distance)

21

## Wheel

### mechanical advantage = (wheel radius / axle radius)

22

## Gears

### mechanical advantage = (output torque / input torque) = (output # of teeth / input # of teeth)

23

## Gear Ratio

### gear ratio = (driving # of teeth / driven # of teeth)

24

## Hydraulic Jack

### mechanical advantage = (output radius^2 / input radius^2)

25

## Linear Momentum

###
how much a body will resist stopping

momentum = (mass x velocity)

26

## Volumetric Flow Rate

### volumetric flow rate = (volume moved / time for the movement)

27

## Density

###
how much mass is in a specific volume of a substance

density = p = (mass / volume)

28

## Pressure

###
the amount of force applied per area

pressure = (force / area)

29

## Pascal's Principle

### a change in the pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fluid as well as to the walls of the containing vessel

30

## Conduction

### the transfer of heat by physical contact

31

## Convection

### the transfer of heat by the movement of fluids

32

## Radiation

### the transfer of heat by electromagnetic waves

33

## Concave Lenses

### make objects appear smaller

34

## Convex Lenses

### make objects appear larger

35

## Current

###
the rate at which the charge flows through a conductive material

measured in Amperes (A)

36

## Voltage

###
the push behind electrical work

measured in volts (V)

37

## Resistance

###
the amount of pressure to slow electrical current

measured in Ohms (OMEGA)

38

## Basic Circuit

### a circuit is a closed loop through which current can flow

39

## Ohm's Law

### voltage (V) = current (I) x resistance (R)

40

## Series Circuits

###
a circuit with two or more resistors on the same path.

R = (Rsub1 + Rsub2)

41

## Parallel Circuits

###
a circuit with two or more resistors on different, parallel paths.

R = (1 / (1 / Rsub1) + (1 / Rsub2))

42

## Electrical Power

### power (P) = current (I) x voltage (V)

43

## Capacitors

###
electrical components which store voltage

capacitors don't stop AC circuits (although they do affect the current flow), but they do stop DC circuits, acting as open circuits

44

## Inductors

###
electrical components which effectively store current

inductors don't stop DC circuits, but they do resist AC circuits as AC circuits utilize changing currents

45