M1 Chapter 1

Question 1

Particle

Answer 1

An object small in comparison with other sizes/lengths 
Can be modelled as a particle 
Mass is concentrated at a single point 
No dimensions 
So no air resistance

Question 2

Rod

Answer 2

Mass of object is distributed along a straight line
Rod has no thickness and is rigid
(One dimensional and doesn’t bend or buckle)

Question 3

Lamina

Answer 3

Mass distributed along a flat surface 
No thickness (2D) 
I.e. A sheet of paper

Question 4

Uniform body

Answer 4

Mass evenly distributed over entire body= uniform

Concentrated at centre of mass = uniform body

Question 5

Light object

Answer 5

Mass is small in comparison to other objects

Can treat it as having 0 mass (i.e. Strings and pulleys)

Question 6

Inextensible string

Answer 6

String that doesn’t stretch under a load

Aka inelastic

Question 7

Smooth surface

Answer 7

Ignore the effects of friction between object and surface

Question 8

Rough surface

Answer 8

There is friction acting between surface and object moving along it

Question 9

Wire

Answer 9

Rigid thin length of metal treated as one dimensional
Threads often on a wire
Can be smooth or rough

Question 10

Smooth pulley

Answer 10

No friction at the bearing of the pulley or between the pulley and the string

Question 11

Light pulley

Answer 11

Pulley has zero mass

Question 12

Bead

Answer 12

Particle which can be threaded onto and move freely along a wire or string

Question 13

Peg

Answer 13

A support from which an object is suspended or on which it can rest
Treated as dimensionless
Usually fixed
Can be rough or smooth

Question 14

Air resistance

Answer 14

Resistance in air due to friction

Considered as negligible in M1

Question 15

Wind

Answer 15

Ignore effects unless specifically mentioned

Question 16

Gravity

Answer 16

Force of attraction between all objects with mass

Attracted towards earth mostly

Question 17

Acceleration towards earth value

Answer 17

9.8