Flashcards
Physics Mechanics
Cards in this deck (60)
- 1Name the SI unit for mass, length , time , temperature , electric current and amount of substance.Kg, m ,seconds , kelvin , Amps , moles
- 2Name the prefixes for Micro , tera , giga and mega .10^-6 , 10^12 , 10^9 , 10^6
- 3What is a scalar Quantity ?A magnitude that consists of just the magnitude (size)
- 4What is a vector quantity ?a quantity that has both magnitude and direction
- 5Name five scalar quantities ?Density , Temperature , Pressure , Frequency and Power
- 6Name five vector quantities ?Displacement , Velocity , Acceleration , Force and momentum
- 7What is speed ?Speed is the distance over time
- 8what is the unit for speed ?ms^2
- 9What is acceleration ?the rate in change in velocity
- 10What is the difference between speed and acceleration?Speed is a scalar quantity and acceleration is a vector quantity
- 11What does a straight line in displacement time graph show ?Constant velocity
- 12What is instantaneous velocity ?the gradient at any point of the displacement time graph
- 13What is the area underneath speed time graphs?Displacement
- 14In the equations of motion what is represented by suvat ?Displacement , initial velocity , final velocity , acceleration and time
- 15What is free fall ?downward movement under the force of gravity only
- 16What is the numerical value for gravity ?9.81 ms^2
- 17What is force ?strength or energy as an attribute of physical action or movement( push or pull)
- 18What is gravitational force , magnetic force and electrical force ?between two objects with a certain mass , between two magnetic objects and charged objects
- 19what is the name of the force that combines electrical force and magnetic force ?Electromagnetic force
- 20Name the First Newton Law and what equation is associated with it ?When an object has no resultant force on it , it wont accelerate it will stay at constant velocity , F=ma
- 21What is weight , its equation ?Gravitantional force on a body , W= mg
- 22What is drag ?its the resistive force the an object experiences when travelling through liquid
- 23Terminal Velocity ?this is when drag and air resistance reaches equilibrium on an object
- 24What is the centre of gravity ?a point where the entire weight of an object is considered to act as a single force.
- 25What is a couple ?It occurs when two forces are equal to each other and opposite to each other but not in a straight line
- 26What is a torque ?Used to describe the turning effect of a couple
- 27Equation for torque ?one of the forces * perpendicular distance between them (nm)
- 28What is the principle of moments ?in a rotation the sum of the clockwise moments is equal to the sum of the anticlockwise moments
- 29Equation for moment ?Fx ( f = force and x = perpendicular distance )
- 30What is Density ?mass perunit volume and si unit = kgm^3
- 31What is pressure ?Force per unit area (pascal )
- 32Equation to work out pressure in liquid ?hpg (h=height , p = density and g = gravity )
- 33What is Thinking distance ?Speed * reaction time
- 34What is breaking distance ?time taken from hitting the brakes to coming to a stop
- 35What is stopping distance ?thinking distance + breaking distance
- 36Equation for car safety kinetic energy ?breaking force * breaking distance
- 37Name 3 things that increase crash time ?seatbelts , crumple zones and air bags
- 38What are crumple zones ?a part of a motor vehicle, especially the extreme front and rear, designed to crumple easily in a crash and absorb the main force of an impact.
- 39What are air bags ?The airbag module is designed to inflate extremely rapidly then quickly deflate during a collision or impact with a surface or a rapid sudden deceleration.
- 40Seat belts ?secure the occupant of a vehicle against harmful movement that may result during a collision or a sudden stop.
- 41What is the equation for work ?work = force * distance
- 42What is the conservation of energy ?total energy in = total energy out (energy cannot be created or destroyed it can only be moved from state to state )
- 43What is gravitational potential energy ?energy stored in an object by virtue of its position in a gravitational field
- 44What is the equation for kinetic Energy ?1/2 mv^2 ( m = mass , v= speed )
- 45What is power ?The rate of doing work
- 46Equation for power ?workdone / time taken
- 47What is efficiency ?the ratio of the useful work performed by a machine or in a process to the total energy expended or heat taken in
- 48Equation for efficiency ?useful output energy / total outpul energy *100
- 49What are sankey diagrams ?Diagrams used to show the efficiency of energy
- 50What are the two types of stretch ?Elastic and plastic
- 51What is Elastic stretch ?when you stretch a material and it returns to its original form
- 52What is plastic stretch ?When a material becomes deformed , where it is permanently stretched
- 53What are tensile forces ?forces that stretch because they cause tension in the object
- 54What are compressive forces ?when you reduce the material`s length by squishing it (spring )
- 55What is elastic limit ?is a point in a material where it has maximised its elasticity
- 56What is plastic deformation ?when an object wont return to its original shape
- 57What is Hooke's law ?the extension of the elastic body is proportional to the force that caused it
- 58Equation for Hooke's law ?F=Kx (x=extension k = for per unit )
- 59What is young modulus ?The ratio between stress and strain
- 60What is stress and strain ?stress is the force per unit cross-sectional area (force / area )
Strain is extension per unit length
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- AS - Level Physics Flashcards on Physics Mechanics , created by Talent Msipa on 21/11/2016.
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- Talent Msipa
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