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9L Press & Mom vocab

words used for pressure and moments @AJHS

altitude sickness An illness caused by very low air pressure. It can be fatal.
antagonistic muscles Two muscles that work a joint by pulling in opposite directions, eg biceps and triceps.
anticlockwise moment The moment of a force in an anticlockwise direction around a pivot.
bends Another name for decompression sickness.
biceps Muscle found at the front of the arm between the shoulder and elbow.
clockwise moment The moment of a force in a clockwise direction around a pivot.
compressed Squeezed together.
contracting Making something smaller or shorter.
decompression sickness Bubbles in the blood caused if divers come to the surface too quickly. It can be fatal.
effort The force put on a lever to put a force on something else.
exert Push on something.
force multiplier A lever used to turn a small force into a larger one.
fulcrum A point around which something turns. Another name for a pivot.
hydraulic A system which works by transmitting pressure through pipes containing a liquid.
in equilibrium In balance.
lever A simple machine which can increase the size of a force.
load The weight or force on something.
machine Something which alters the size or direction of a force.
moment The turning effect of a force. It is calculated using: moment = force x distance of force from pivot.
newton metre (Nm) The unit for the moment of a force.
pascal (Pa) A unit for pressure. 1 Pa = 1 N/m2.
pivot Another name for a fulcrum.
pneumatic Containing air or gas under pressure, eg tyres.
pressure The force on a certain area, measured in newtons per square metre (N/m2), newtons per square centimetre (N/cm2), or pascals (Pa).
principle of moments The principle of moments states that when something is in equilibrium (in balance), the clockwise moment is equal to the anticlockwise moment.
radius bone The bone in the forearm that the biceps muscle pulls on.
triceps Muscle found at the back of the arm between the shoulder and elbow.
turning effect The moment of a force. The way in which a force turns something around a pivot.
Created by: johncl