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Particle
Rotational forces and air resistance ignored
Lamina
Mass distributed across a flat surface
Light Object
Object mass is zero
Tension is the same at both ends of the light string
Inextensible String
Acceleration is the same in object connected by an inextensible string
Rough Surface
Frictional force present
Smooth and Light Pulley
Pulley = no mass
Tension is the same on either side of the pulley
Bead
Moves freely along the wire or the string
Tension is the same on either side
Gravity
Assume that all objects with mass are attracted towards Earth
Vertically downwards 9.8
