physics UNIT 3 3.0 / 5 based on 1 rating ? PhysicsGCSEAQA Created by: Bryony HowellCreated on: 21-05-13 09:26 the turning effect of a force is called? the moment 1 of 27 lever is a force which acts like a? force multiplier 2 of 27 forces can be used to turn objects around a particular point? pivot point 3 of 27 The centripetal force may be provided by what? friction and tension 4 of 27 What is the unit of pressure? Pa (pascals) 5 of 27 when there is a change in velocity there is also a what? associated acceleration 6 of 27 centripetal force used to make object perform a circle motion increases by increase in mass, increase in speed and decreasing radius of circle 7 of 27 Electromagnetic induction uses movement to produce what a current 8 of 27 when is the plumb line used to fine the C of M of thin, irregular shapes 9 of 27 why are lasers used in surgery? to repair damaged retinas and to remove diseased or damaged cells 10 of 27 how do lasers removed diseased or damaged cells? by cutting, cauterising or burning the tissue 11 of 27 what do medical endoscopes do? use the principle of total reflection to see inside the body 12 of 27 In the Pendulum the no. of time the mass swings back and forth gives what? it's frequency of oscillation 13 of 27 What are optical fibres used for? to guide the laser beam to the correct area of the body 14 of 27 What does the word laser mean? Light Amplification by Stimulated Emission of Radiation 15 of 27 what is the measurement of the near point the eye can focus on? approximately 25cm 16 of 27 What does the cornea do? reflects most the light 17 of 27 what does the pupil do? adjusts the light intensity 18 of 27 what does the lens do? provides further refraction 19 of 27 what does the retina do? it is where the image is formed, it is light sensitive 20 of 27 what is long sight caused by? the eyeball being too short and unable to focus on near objects 21 of 27 what is short sight caused by? the eyeball being too long and unable to focus on distant objects 22 of 27 what are glasses made from? concave lenses, convex lenses or a combination of both 23 of 27 how does a converging lens in a camera produce an image? via a CCD or on film 24 of 27 an image produced by a convex lense is? real, inverted and smaller 25 of 27 an image produced on a concave lense is? virtual and upright 26 of 27 what can a converging lens be used as? a magnifying glass 27 of 27
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