Karteikarten
G481 KEY WORDS
Karten in diesem Stapel (53)
- 1AccelerationThe rate of change of an objects velocity. a=v/t
Unit: ms-2 - 2Average SpeedTotal distance travelled by an object divided by the total time taken.
- 3Braking distanceThe distance travelled by a vehicle from the moment when the brakes are applied until the vehicle comes to a stop.
- 4BrittleDescribes a material that shows no plastic deformation and breaks just beyond its elastic limit.
- 5Centre of GravityThe point where the entire weight of an object appears to act.
- 6Components (of a vector)The magnitudes of a vector quantity in two perpendicular directions.
- 7CompressiveA force that squeezes an object
- 8DensityThe mass per unit volume of a material.
p=m/V
Unit: kgm-3 - 9DisplacementThe distance moved by an object in a particular direction(measured from a fixed starting point)
- 10DuctileDescribes a material that can easily be drawn into wires (e.g. copper)
- 11DynamicsA study of motion involving force and mass.
- 12EfficiencyThe ratio of useful output energy to the total input energy for a device, expressed as a percentage.
Efficiency= Useful output energy x100
Total input energy - 13ElasticDescribes a material which will return to its original shape once the forces are removed.
- 14Elastic LimitThe value of stress beyond which an object will not return to its original dimensions.
- 15Elastic Potential EnergyEnergy stored in an extended or compressed material.
- 16Equations of motion
- 17EquilibriumAn object in equilibrium is either at rest or travelling with a constant velocity because the net force on it is zero.
- 18ExtensionThe change in the length of a material from its original length.
- 19Force ConstantThe ratio of force to extension for a spring or a wire.
Unit: Nm-1 - 20Gravitational Potential EnergyEnergy stored by an object by vitue of its position in the Earths gravitational field.
- 21Hooke's LawThe extension produced in an object is proportional to the force producing it, provided the elastic limit is not exceeded.
- 22InertiaA measure of the mass of an object. A massive object has a large inertia.
- 23Instantaneous speedThe speed of an object measured over a very short period of time.
- 24Kilo-watt hourThe energy transferred by a 1kW device in a time of 1 hour.
1kWh= 3.6 kJ - 25KinematicsA study of motion using quantities such as time, distance, displacement, speed, velocity and acceleration.
- 26Kinetic EnergyEnergy of an object due to its motion
- 27MassA measure of the amount of matter within an object.
Unit: Kilograms - 28MomentThe moment of a force about a point is the magnitude of the force, multiplied by the perpendicular distance of the point from the line of the force.
Unit: Nm - 29NewtonThe force that will give a 1kg mass an acceleration of 1ms-2 in the direction of the force.
1N = 1kgms-2 - 30Plastic DeformationThe deformation of a material past its elastic limit.
- 31PowerThe rate at which energy is transferred or the rate at which work is done.
Unit: watt (W) - 32PressureThe force acting normally per unit area of a surface.
p=F/A
Unit: Nm-2 or Pa - 33Principal of MomentsThe sum of clockwise moments about a point is equal to the sum of anticlockwise moments about the same point.
- 34ProjectileAny object thrown in the Earths gravitational field.
- 35RangeThe horizontal distance covered by an object.
- 36Resultant ForceThe net force acting on an object.
- 37Scalar QuantityA scalar quantity has magnitude but no direction.
- 38SpeedThe rate of change of the distance moved by an object.
Speed = Distance/time
Unit: ms-1 - 39Stopping DistanceThe sum of the thinking distance and the braking distance
- 40StrainThe extension per unit length produced by tensile or compressive forces.
Strain= extension
original length - 41StressThe force acting per unit cross-sectional area.
Stress= Force
Cross-sectional area
Unit: Nm-2 - 42TensileA term used to denote tension or pull
- 43Terminal velocityThe constant velocity of an object travelling through a fluid. The net force of an object is zero.
- 44Thinking distanceThe distance travelled by a vehicle in a time equal to the reaction time of the driver.
- 45TorqueThe product of one of the forces of a couple and the perpendicular distance between them.
Unit: Nm - 46Ultimate Tensile Strength (UTS)The breaking stress of a material.
UTS = Breaking force
Cross-sectional area - 47Uniform Acceleration Uniform MotionAcceleration that remains constant.
Motion of an object travelling with a constant acceleration. - 48Vector Addition Vector TriangleUsing a drawing, often to scale, to find the resultant vector.
A triangle drawn to determine the resultant of two vectors. - 49Vector QuantityA vector quantity has both magnitude and direction.
- 50VelocityThe rate of change of the displacement of an object.
Velocity = Change in displacement
time
Unit: ms-1 - 51WeightThe force of an object caused by a gravitational field acting on its mass.
Weight = mass x acceleration of free fall
Unit: newtons (N) - 52Work DoneThe product of the force and the distance moved by the force in the direction of travel.
- 53Young ModulusThe ratio of stress to strain for a given material, resulting from tensile forces, provided Hooke's law is obeyed.
Young modulus=Stress/strain
Unit: Pa
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- A Level Physics Karteikarten am G481 KEY WORDS , erstellt von sophiewalkerrock am 23/12/2013.
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