PHYSICS- moments
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What do we call the point where a lever or seesaw is fixed?
The pivot
What do we call the force applied to a lever?
The effort
What do we call the weight or force moved by a lever?
The load
What do we call the turning effect of a force?
The moment
How do we calculate the moment of a force?
Moment = size of force x distance from pivot
What units do we use for the moment of a force?
Newton-metres (Nm) or Newton-centimetres (Ncm)
The principle of moments says a seesaw will balance when…
…the clockwise moment equals the anticlockwise moment
A simple version for the principle of moments for a seesaw is…
…(force x distance) on left = (force x distance) on righ
Pressure is equal to what?
Force ÷ Area
Units for pressure are what?
N/cm2 or N/m2 (also known as Pascals)
Objects which are wide and apply a small pressure include what?
skis, snowshoes, camels’ feet, tractor tyres, snowboards
Objects which work by applying a large pressure include what?
pin, sharp blade
An example of a device where a pressure is transmitted through a liquid from one place to another is what?
Hydraulic brakes