Physics- General Physics 0.0 / 5 ? PhysicsGeneral PhysicsIGCSECIE Created by: KitsuneCreated on: 21-02-17 17:04 What two instruments do we use to measure very small lengths? Micrometer screw gauge, vernier calipers 1 of 42 How to find a volume of an irregularly shaped object? Use a measuring cylinder which contains a liquid. Find the volume by displacement. 2 of 42 What is mass? The amount of matter something is made of 3 of 42 What is density? The ratio of mass to volume or how concentrated the matter is 4 of 42 How to find density? Mass/volume 5 of 42 What do you measure time with? Stopwatch/stop-clock 6 of 42 How would you measure the thickness of one paper sheet with a ruler? Measure the thickness of several pieces and then find the average 7 of 42 What is speed? Distance travelled by an object in a unit of time 8 of 42 What is acceleration? The rate at which the velocity changes 9 of 42 How to find acceleration? Change in velocity/ time taken 10 of 42 What is velocity? Speed in a particular direction 11 of 42 What type of quantity is velocity? Vector 12 of 42 What do vectors have? Magnitude and direction 13 of 42 Acceleration is ..... if the line on the graph is straight Constant 14 of 42 What is weight? Gravity acting on an objet's mass 15 of 42 What type of quantity is weight? Vector 16 of 42 How to find weight? Mass x acceleration of free fall 17 of 42 What is the force that exists when two objects touch? Contact force 18 of 42 What direction does friction act in? One that is opposite to motion 19 of 42 Name the force that exists when an object is falling through air Drag/air resistance 20 of 42 What is the upward push of liquids? Upthrust 21 of 42 What are forces measure in? Newtons 22 of 42 How do we show that a force is vector? With an arrow 23 of 42 What is the resultant force? A single force that has the same effect as two or more forces 24 of 42 What happens when there is no resultant force? There is no acceleration so an object will either stay at rest or move at a constant speed 25 of 42 Why does an object accelerate when it falls? The force of gravity is acting upon it 26 of 42 Why does every object fall with the same acceleration? The Earth pulls every kilogram with the force of 10N 27 of 42 What is the acceleration of free fall? Acceleration caused by the Earth's gravity field 28 of 42 What field is close to the Earth's surface? Uniform gravitational field 29 of 42 Describe how an objects reachers terminal velocity Air resistance affects acceleration and eventually it balances the object's weight so it stops accelerating at moves at a steady speed 30 of 42 How to calculate force? Mass x acceleration 31 of 42 What force does an object moving in a circle experience? Centripetal force 32 of 42 Where does the force that keeps an object moving in a circle act? Toward the center of the circle 33 of 42 What is force? The action of one body on another that causes its velocity to change 34 of 42 What is a newton? The force required to give a mass of 1 kg an acceleration of 1m/s^2 35 of 42 What two things does the effect of a force depend on? How big it is and how long it lasts for 36 of 42 What is the impulse equation? Ft=mv-mu 37 of 42 What is Ft The impulse 38 of 42 What is mv or mu The momentum 39 of 42 what is impulse? The change in momentum 40 of 42 what is the principle of conservation of momentums? Total momentum before = total momentum after 41 of 42 Give 5 examples of scalar quantities. Speed, mass, energy, temperature, density 42 of 42
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