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39 terms

Science -Force and Motion words

useful words to know for force and motion
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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