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Motions and Forces

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

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