A.1 Kinematics - Key terms

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46 Terms

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kinematics

study of motion

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classical physics

physics theories that pre-dated the paradigm shifts introduced by quantum physics and relativity

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uniform

unchanging

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magnitude

size

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scalars

quantities that have only magnitude (no direction)

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vector

a quantity that has both magnitude and direction

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distance

total length travelled, without consideration of directions

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displacement, linear

distance in a straight line from a fixed reference point in a specified direction

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metre, m

SI unit of length (fundamental)

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speed, v

average speed = distance travelled/time taken, instantaneous speed is determined over a very short time interval, during which it is assumed that the speed does not change

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reaction time

the time delay between an event occurring and a response, for example, the delay that occurs when using a stopwatch

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sensor

an electrical component that responds to a change in a physical property with a corresponding change in an electrical property (usually resistance), also called a transducer

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light gate

electronic sensor used to detect motion when an object interrupts a beam of light

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second, s

SI unit of time (fundamental)

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at rest

stays stationary in the same position

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milky way

the galaxy in which our solar system is located

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velocity, v

rate of change of position

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acceleration, a

rate of change of velocity with time, acceleration is a vector quantity

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deceleration

term commonly used to describe a decreasing speed

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linear relationship

one which produces a straight line graph

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gradient

the rate at which one physical quantity changes in response to changes in another physical quantity, commonly, for an y-x graph, gradient = Δy / Δx

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integration

mathematical process used to determine the area under a graph

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spreadsheet (computer)

electronic document in which data is arranged in rows and columns of a grid, and can be manipulated and used in calculations

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calculus

branch of mathematics which deals with continuous change

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differentiate

mathematically determine an equation for a rate of change

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equations of motion

equations that can be used to make calculations about objects that are moving with uniform acceleration

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air resistance

resistive force opposing the motion of an object through air, a type of drag force

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acceleration due to gravity, g

acceleration of a mass falling freely towards earth, on, or near the earth’s surface, g = 9.8 ≈ 10 m/s², also called acceleration of free fall

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free fall

motion through the air under the effects of gravity but without air resistance

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negligible

too small to be significant

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projectile

an object that has been projected through the air and which then moves only under the action of the forces gravity and air resistance

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resolve (a vector)

to express a single vector as components (usually two components which are perpendicular to each other)

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stroboscope

apparatus used for observing rapid motions, it produces regular flashes of light at an appropriate frequency chosen by the user

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trajectory

path followed by a projectile

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parabolic

in the shape of a parabola, the trajectory of a projectile is parabolic in a gravitational field if air resistance is negligible

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range (of a projectile)

horizontal distance travelled before impact with the ground

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impact

collision involving relatively large forces over a short time

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imagination

formation of new ideas that are not related to direct sense perception or experimental results

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intuition

immediate understanding, without reasoning

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inspiration

stimulation (usually to be creative)

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drag

force(s) opposing motion through a fluid; sometimes called fluid resistance

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fluid

liquid or gas

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fluid resistance (friction)

force(s) opposing motion through a fluid; sometimes called drag

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terminal speed (velocity)

the greatest downards speed of a falling object that is experiencing resistive forces (for example, air resistance), it occurs when the object’s weight is equal to the sum of resistive forces (+ upthrust)

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video analysis

analysis of motion by freeze-frame or slow-motion video replay

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thought experiment

an experiment that is carried out in the mind, rather than actually being done, normally because it is otherwise impossible