phy

• Physics


  A branch of science centred on the study of matter, energy and connection between them
• Physical Quantity


  The quantity that can be measured
• Base Quantity


  Physical quantity that cannot be derived further
• Derived Quantity


  Physical quantity derived from base quantity by multiplication or division or both
• Scalar quantity


  The quantity which has only magnitude
• Vector quantity


  The quantity that has both magnitude and direction
• Resultant vector


  Two vector acting at a point can be replaced by a single vector with the same effect
• Systematic errors


  Cumulative error that can be compensated for if the error are known
• Random errors


  Arise from unknown and unpredictable variations in condition will produce a different error every time you repeat the experiment
• Parallax error


  It's an error in reading an instrument because observer's eye and pointer are not in a line perpendicular to the plane of a scale
• Consistency


  The ability to register the same reading when a measurement is repeated
• Accuracy


  The degree of closeness to the actual value
• Sensitivity


  The ability of an instrument to detect a small change in measurement
• Linear motion


  A straight line motion
• Distance, s


  The length of the actual path travelled
• Displacement


  The shortest distance travelled in a specific direction
• Speed, v


  1. The rate of distance changed

  2. The change of distance per unit time (gradient of graph S vs. t)
• Velocity


  1. The rate of displacement changed

  2. The displacement change per unit time (gradient of graph vs. t)
• Acceleration


  1. The rate of velocity changed (gradient of graph vs. t)

  2. The velocity change per unit time
• Frequency


  Number of complete oscillation made in a unit of time
• Tick / time interval


  Time taken to produced two successive dots by a ticker timer
• Inertia


  1. Is the tendency of an object to remain at rest, or keep moving at constant speed in a straight line

  2. Is the property of a mass which resists change from its state of rest or motion
• Newton's First Law of motion


  State that an object will remain at rest or continue with a constant speed in a straight line (i.e. constant velocity) unless acted on by an unbalanced force
• Newton's Second Law of motion


  State that the force acts on an object is directly proportional to the rate of change of momentum
• Newton's Third Law of Motion


  State that an action force will produce a reaction force, with same magnitude by act in opposite direction
• Momentum


  The product of mass and velocity
• Impulse


  Change in momentum
• Principle of conservation of momentum


  State that if there is no external force acting on the objects, the total momentum before collision is equal to the total momentum after the collision
• Elastic collision


  Collision of particles which its total kinetic energy is conserved (particles does not stick together after collide)
• Inelastic collision


  Collision of particles which its total kinetic energy is not conserved (particle stick together after collide)
• Impulsive force


  Force which only act within a very short duration
• Balanced forces


  Do not affect an object's motion. The object will remain stationary, or continue to move at a constant velocity in a straight line
• Unbalanced forces


  Object will accelerates or decelerates in a straight line
• Resultant force


  The sum of forces which act on an object
• Gravitational field


  Region in which an object experiences gravitational attraction/pull towards the centre of the earth
• Gravitational acceleration


  Accelerate due to the pull of the gravitational force
• Gravitational field strength


  Gravitational force which acted on a unit of mass
• Free fall


  Fall due to the gravitational pull only
• Weight


  The product of mass and gravitational field strength
• Mass


  The amount of particles consist in an object