Modelling in mechanics
- Created by: navdha2002
- Created on: 28-06-20 19:31
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- MODELLING IN MECHANICS
- gravity
- force of attraction between all objects due to gravity (g). g is 9.8 m/s^2
- g is constant and is taken as 9.8 unless otherwise stated in the question
- assume that all objects with mass are attracted to the earth
- force of attraction between all objects due to gravity (g). g is 9.8 m/s^2
- uniform body
- mass is distributed evenly
- mass of an object is concentrated at a single point; at the geometric centre of the body - the centre of the mass
- mass is distributed evenly
- rod
- all dimension but one are negligible, like a pole or a beam
- rigid ( doesn't bend or buckle )
- no thickness
- mass is concentrated along a line
- all dimension but one are negligible, like a pole or a beam
- lamia
- object with area but negligible thickness like a sheet of paper
- mass id distributed over a flat surface
- object with area but negligible thickness like a sheet of paper
- smooth and light pulley
- all pulleys you consider will be a smooth and light pulley
- pulley has no mass
- tension is the same on either side of the pulley
- all pulleys you consider will be a smooth and light pulley
- particle
- dimensions of the object are negligible
- mass of the object is concentrated at a single point
- rotational forces and air resistance an be ignored
- dimensions of the object are negligible
- air resistance
- resistance experienced as an object moves through the air
- usually modelled as negligible
- resistance experienced as an object moves through the air
- inextensible string
- a sting that does not stretch when under load
- acceleration is the same in objects connected by a taught inextensible string
- a sting that does not stretch when under load
- wire
- rigid thin length of metal
- treated as one dimension
- rigid thin length of metal
- light object
- smooth surface
- bead
- particle with a hole in it for threading on a wire or string
- tension is the same on either side of the bead
- moves freely along the wire or string
- particle with a hole in it for threading on a wire or string
- peg
- gravity
- mass of the object is small compared to the other masses like a string or a pulley
- tension is same at both ends of the light string
- treat the object as having 0 mass
- light object
- resistance experienced as an object moves through the air
- usually modelled as negligible
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