#P2.3a
explain that to stretch, bend or compress an object, more than one force has to be applied
applications to real life situations
#P2.3b
describe the difference between elastic and plastic deformation (distortions) caused by stretching forces
#P2.3c
describe the relationship between force and extension for a spring and other simple systems
graphical representation of the extension of a spring
#P2.3d
describe the difference between linear and non-linear relationships between force and extension
#P2.3e
calculate a spring constant in linear cases
#P2.3f
calculate the work done in stretching
#P2.3g
describe that all matter has a gravitational field that causes attraction, and the field strength is much greater for massive objects
#P2.3h
define weight, describe how it is measured and describe the relationship between the weight of an object and the gravitational field strength, g
knowledge that the gravitational field strength is known as g and has a value of 10 N/kg at the earth’s surface
#P2.3i
recall the acceleration in free fall
#P2.3j
apply formulae relating force, mass and relevant physical constants, including gravitational field strength, g, to explore how changes in these are inter-related
#P2.3k
describe examples in which forces cause rotation
location of pivot points and whether a resultant turning force will be in a clockwise or anticlockwise direction
#P2.3l
define and calculate the moment of a force
application of the principle of moments for objects which are balanced
#P2.3m
explain how levers and gears transmit the rotational effects of forces
an understanding of ratios and how this enables gears and levers to work as force multipliers
#P2.3n
recall that the pressure in fluids (gases and liquids) causes a net force at right angles to any surface
#P2.3o
use the relationship between the force, the pressure and the area in contact
an understanding of how simple hydraulic systems work