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what is a moment
the turning effect of a force
what is the principle of moments
for an object to be in equilibrium the sum of the clockwise moments must equal the sum of the anticlockwise moments
what is the centre of mass
the point through which a single force on the body has no turning effect and where the weight of the body is considered to act.
what is a couple
a pair of equal and opposite forces acting on the same body along the same line
what is a torque
the total moment of a couple
for an object to be stable what needs to happen
the weight must be acting within the object
what is one km/h equal to
0.28m/s
what is one m/s equal to
3.6 m/s
what is an elastic collision
no kinetic energy is lost in the collision
what is an inelastic collision
the objects have less kinetic energy after collision than before
why does an object balance about its centre of mass
mass is equally distributed on both sides therefore acw moments = cw moments
