Science -Force and Motion words

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useful words to know for force and motion

motion

changing position, the act of changing location from one place to another

triangle formula

a method used to rearrange the symbols of scientific equations

distance

how far an object has travelled, size of the gap between two places

unit

what a variable or quantity is measured by

time

how long a journey takes

speed and velocity

how fast an object is travelling (both names, s----- and v-------)

speedometer

instrument used to measure speed/velocity, a meter fixed to a vehicle that measures and displays its speed

instantaneous speed

the speed of an object at one instant in time

average speed

a measurement of the middle rate of speed of a journey

distance-time graph

graph in which distance is measured against time

slope

steepness of a graph line

stationary

object that is not moving due to equally applied forces

constant speed

object that is moving at the same rate because of equally applied forces

acceleration

increase of the speed/velocity of an object

deceleration

decrease in the speed of an object

quantity

an amount of something

variable

an aspect of a situation/experiment that is changed

scientific formula

an equation that links several variables

compression

squashing of an object

extension

the act of lengthening/stretching an object

mass

amount of matter in an object

gram

unit of mass

kilogram

equal to 1000 grams

weight

force of gravity on an object

gravitational force

caused by the gravitational pull of the Earth

newton

unit of force

directly related

one variable increases as the other increases

inversely related

one variable decreases as the other increases

volume

amount of space an object or substance occupies

density

mass of a standard volume of a substance

friction

force which arises when two substances rub together

drag

friction created when a solid passes through air or water

kinetic energy

energy possessed by moving bodies

heat energy

energy which causes a rise in temperature

pressure

force acting per unit area

balanced forces

equal and opposite forces

Newton's First Law

an object will remain still or at a constant speed unless acted on by an outside unbalancing force

action-reaction

forces always come in pairs

gravity

forces of attraction between bodies that have mass eg. people to earth, the moon to the earth, the earth to the sun

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