# mechanics definitions and formulae

Forums Leaving Cert Physics mechanics definitions and formulae

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• #1677

here’s s what we’ve done of mechanics so far…
if it’s any use to you.
i type these notes up anyway, i just post them here in case they’re any use to anyone.
let me know what you thinks ^.^

displacement (s) – distance ion a given direction

velocity (v) – m/s or m.s (to the power of -1) m=meters s=seconds

constant velocity – if an object moves in a straight line and does not
speed up or slow down

acceleration – change in velocity per second
m.s (to the power of -2)

newton’s equations of motion

v = u + a t

s = u t + 1/2 a t(squared)

v(squared) = u(squared) + 2 a s

if you’re dropping an object, a = gravity = 9.8 or 10

newton’s laws of motion

1. every body will remain at rest or at constant velocity unless an unbalanced
external fource acts on it
2. when an unbalanced force acts on a body, the rate of change of the body’s
momentum is directly proportional to the force, and takes place in the
direction of the force
2. every action has an equal but opposite reaction

corrections? comment me
– m
xx