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Physics

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Every measurement has two parts. Magnitude (numerical value) Unit ... The rate of change in position with time. Newton's First Law of Motion: Inertia ... – PowerPoint PPT presentation

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Title: Physics


1
Physics
  • The study of interactions of matter and energy in
    all their diverse forms

2
Base quantities
  • Length
  • Standard unit of length is the meter
  • Mass
  • Standard unit of mass is kilogram
  • Time
  • Standard unit of time is second

3
Derived quantities
  • These quantities are derived from a combination
    of one or more of the three base quantities
  • Volume
  • Velocity
  • Acceleration
  • Energy
  • Power
  • Work
  • Momentum
  • Force

4
Special Quantities
  • Designed to support measurement in specialized
    areas of science and technology
  • Special quantities in Radiology
  • Exposure
  • Effective dose
  • Radioactivity
  • Dose equivalent

5
System of Units
  • Every measurement has two parts
  • Magnitude (numerical value)
  • Unit (measurement)

6
Mechanics
  • A segment of physics that deals with the motion
    of objects

7
Motion of an object
  • Velocity
  • Speed
  • VD
  • T
  • Acceleration
  • The rate of change in position with time

8
Newtons First Law of Motion Inertia
  • A body will remain at rest or continue to move
    with a constant velocity in a straight line
    unless acted on by an external force

9
Newtons Second Law Force
  • The force (F) acted on an object with
    acceleration (a) is equal to the mass (m)
    multiplied by the acceleration.

10
Newtons Third Law Action/Reaction
  • For every action there is an equal and opposite
    reaction

11
Weight measured in Newtons (N)
  • A force on a body caused by the downward pull of
    gravity on it.
  • Wt mg

12
Momentum
Pmv Pmomentum Mmass Vvelocity
  • The product of mass and velocity.
  • The total momentum before any interaction is
    equal to the total momentum after the interaction.

13
Workmeasured in joules (J)
  • The product of force and distance.
  • W fd
  • W work
  • F force
  • D distance

14
Powermeasured in watts (W)
  • The rate of doing work
  • P w/t
  • Ppower
  • Wwork
  • Ttime

15
The Law of Conservation of Energy
  • Energy may be transformed from one from to
    another but cannot be created or destroyed
  • The total amount of energy is constant

16
Heatthe unit of heat is the calorie (c)measured
by temperature (F or C)
  • The kinetic energy of the random motion of
    molecules

17
Temperature
  • The degree of heat or cold, expressed in terms of
    a specific scale
  • Scales include
  • Fahrenheit
  • Celsius
  • Kelvin

18
Temperature Conversion Formulas
  • Tc 5/9 (Tf 32)
  • Converts F to C
  • Tf 9/5 Tc 32
  • Converts C to F
  • Tk Tc 273
  • Converts C to K
  • Tc Tk 273
  • Converts K to C

19
Methods of Heat Transfer
  • Conduction
  • Transfer of heat by touch
  • Convection
  • The mechanical transfer of rapidly moving
    molecules in a gas or liquid from one place to
    another
  • Radiation
  • Transfer of heat through space

20
THE END
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