#P4.1.1
recall and apply Newton’s third law
#P4.1.2
recall examples of ways in which objects interact: by gravity, electrostatics, magnetism and by contact (including normal contact force and friction)
#P4.1.3
describe how examples of gravitational, electrostatic, magnetic and contact forces involve interactions between pairs of objects which produce a force on each object
#P4.1.4
represent interaction forces as vectors
#P4.1.5
define weight
#P4.1.6
describe how weight is measured
#P4.1.7
recall and apply the relationship between the weight of an object, its mass and the gravitational field strength:
weight (N) = mass (kg) × gravitational field strength (N/kg)