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20 terms

Karen and Daphne

Motions and Forces
STUDY
PLAY
forces
a push or a pull
motion
a change of position
speed
distance travelled per unit time
velocity
the speed of an object in a particular direction
acceleration
(physics) a rate of change of velocity
newton
the SI unit of force
net force
The overall force on an object when all the individual forces acting on it are added together
weight
the force of gravity on an object
mass
a body of matter without definite shape
gravity
(physics) the force of attraction between all masses in the universe
terminal velocity
the constant maximum velocity reached by a body falling through the atmosphere under the attraction of gravity
free fall
the motion of a falling object when the only force acting on it is gravity.
projectile motion
the curved path that an object follows when thrown, launched, or otherwise projected near the surface of Earth
inertia
(physics) the tendency of a body to maintain is state of rest or uniform motion unless acted upon by an external force
pressure
the force applied to a unit area of surface
fluid
a continuous amorphous substance that tends to flow and to conform to the outline of its container: a liquid or a gas
pascal
a unit of pressure equal to one newton per square meter
atmospheric pressure
the pressure caused by the weight of the atmosphere
buoyant force
upward force exerted on an object immersed in a fluid, the upward force that keeps an object immersed in or floating on a fluid
archimedes' principle
the buoyant force on an object is equal to the weight of the fluid displaced by the object