#P2.2a
recall examples of ways in which objects interact
electrostatics, gravity, magnetism and by contact (including normal contact force and friction)
#P2.2b
describe how such examples involve interactions between pairs of objects which produce a force on each object
#P2.2c
represent forces as vectors
drawing free body force diagrams to demonstrate understanding of forces acting as vectors
#P2.2d
apply Newton’s First Law to explain the motion of an object moving with uniform velocity and also an object where the speed and/or direction change
looking at forces on one body and resultant forces and their effects (qualitative only)
#P2.2e
use vector diagrams to illustrate resolution of forces, a net force (resultant force), and equilibrium situations
scale drawings limited to parallel and perpendicular vectors only
#P2.2f
describe examples of the forces acting on an isolated solid object or system
examples of objects that reach terminal velocity for example skydivers and applying similar ideas to vehicles
#P2.2g
describe, using free body diagrams, examples where two or more forces lead to a resultant force on an object
#P2.2h
describe, using free body diagrams, examples of the special case where forces balance to produce a resultant force of zero (qualitative only)
#P2.2i
apply Newton’s second law in calculations relating forces, masses and accelerations
#P2.2j
explain that inertia is a measure of how difficult it is to change the velocity of an object and that the inertial mass is defined as the ratio of force over acceleration
#P2.2k
define momentum and describe examples of momentum in collisions
an idea of the law of conservation of momentum in collisions
#P2.2l
apply formulae relating force, mass, velocity and acceleration to explain how the changes involved are inter-related
#P2.2m
use the relationship between work done, force, and distance moved along the line of action of the force and describe the energy transfer involved
#P2.2n
calculate relevant values of stored energy and energy transfers; convert between newton-metres and joules
#P2.2o
explain, with reference to examples, the definition of power as the rate at which energy is transferred
#P2.2p
recall and apply Newton’s third law
application to situations of equilibrium and non-equilibrium
#P2.2q
explain why an object moving in a circle with a constant speed has a changing velocity (qualitative only)