# Shared Flashcard Set

## Details

Motion, Optics, Measurement
Projectile motion, forces, images, refraction, reflection, quantities, errors, etc.
39
Physics
06/10/2012

Term
 7 Fundamental Quantities
Definition
 Mass. Amount of substance. Temperature. Electric current. Brightness. Length. Time.
Term
 Derived quantity
Definition
 a mixture of fundamental quantitiesF = m x a
Term
 Accuracy
Definition
 the measure of 'closeness' to the true or exact value
Term
 Precision
Definition
 a measure of similarities between results
Term
 Random errors
Definition
 Have no identifiable cause. They tend to make results fluctuate inconsistently
Term
 Systematic errors
Definition
 can be explained and tend to be uni-directional
Term
 Name some systematic errors
Definition
 Instrumental error. Zero error. Error due to change in conditions. Wrong use of instrument. Parallax error.
Term
 Absolute error (formula)
Definition
 observed value - accepted value
Term
 Relative error (formula)
Definition
 absolute error ÷ accepted value x 100%
Term
 Real images
Definition
 can be projected onto a screen and they are inverted
Term
 Virtual images
Definition
 generally appear behind the mirror and are upright
Term
 Spherical aborations
Definition
 is the inability for a concave mirror to focus light to a single point. This occurs more commonly when mirrors are large or the opening for light is too broad. Spherical aborations result in fuzzy or blurred images
Term
 Refraction
Definition
 is the bending of light rays as they move from one medium to another. Light rays bend towards the normal when they go from a less optically dense medium to a more optically dense medium.
Term
 Snell’s Law
Definition
 states that the refractive index for a material could be found by dividing the sign of the angle of incidence by the sign of the angle of refraction
Term
 Dispersion
Definition
 when white light is shined through an object and the colours separate due to the slightly different refractive index of each one, making them more visable
Term
 Spectrum
Definition
 the colour pattern that is formed due to dispersion
Term
 Total Internal Reflection
Definition
 is when the light rays bend towards the normal when you move from a less optically dense medium to a more dense medium. The opposite is also true.
Term
 Critical angle
Definition
 is when the angle of refraction is 90 degrees
Term
 Optical power
Definition
 is the ability of the lens to refract light, using the unit dioptre D
Term
 Centre of Curvature
Definition
 is the centre of the sphere that the lens forms a part of
Term
Definition
 is the radius of the sphere from which the lens is said to form
Term
 Principal axis
Definition
 is the line joining the centre of curvature through the optical centre of the lens
Term
 Principal focus
Definition
 is the point where light rays which enter the lens parallel to each other converge on the other side of the lens
Term
 Scalar quantities
Definition
 have only magnitude (size) but no direction.
Term
 Name some scalar quantities
Definition
 Energy. Mass. Distance. Speed. Temperature.
Term
 Vector quantities
Definition
 have both magnitude and direction. To show a quantity is a vector, sometimes they are written with an arrow, bar or wavey line above the representative letter. For example velocity ṽ.
Term
 Newton's 1st Law
Definition
 Objects that are at rest will remain at rest unless they are acted upon by an unbalanced outside force
Term
 Newton's 2nd Law
Definition
 When a net force acts on an object it produces an acceleration that is proportional to the size of the force
Term
 Newton's 3rd Law
Definition
 When one object exerts a force on a second object, then the second object exerts a force on the first object in the opposite direction
Term
 Name contact forces
Definition
 Pushing. Pulling. Friction. Twisting.
Term
 Name non-contact forces
Definition
 Magnetic. Gravitational. Electrostatic.
Term
 Weight
Definition
 is the force on an object due to the acceleration of gravity
Term
 Mass
Definition
 is the amount of matter present in a body. It is not density, size or weight. Mass is described by Netwon’s 1st law of motion and is related to the inertia of a body.
Term
 Force of Gravity
Definition
 is the pulling force that attracts onjects held above the Earth’s surface to the Earth’s centre
Term
 Terminal velocity
Definition
 is the constant speed that a freely falling object eventually reached when the resistance of the medium through which it is falling prevents further acceleration
Term
 Drag force
Definition
 is the force that acts in a direction opposite to the oncoming flow of a velocity. For example: frictional force between an object and the medium through which it is moving --> air resistance and gravity.
Term
 Complimentary angles in projectile motion have...
Definition
 the same displacement (30degrees and 60 degrees)
Term
 Vertical component in projectile equals..
Definition
 time
Term
 Horizontal component in projectile equals..
Definition
 range (has constant velocity (a=0ms^2))
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