1. Weight
Reaction Force
Tension
Thrust
Friction

2. Word
Meaning
Modelling Assumption
Particle
Light object
Inextensible
Smooth
Rough

3. Stationary object on a slope
Object being pulled along a rough horizontal surface by an angled string
Object A is on a rough surface connected to object B by a light inextensible string
Two unequal masses suspended over a smooth light pulley, attached by a light inextensible string

4. A particle C is suspended from two points A and B by two light inextensible strings
A smooth hollow bead is suspended from points A and B by a light inextensible string
Mass A is sat on top of mass B. Mass B is sat on a light tray attached to point C by two strings which are supported by a single string above C
Extension: Two separate masses A and B are sat on two rough slopes with different coefficients of friction. They are attached by a light inextensible string passing through a smooth ring C which is suspended by a vertical light inextensible string C