Mechanics

Question 1

Air resistance

Answer 1

The friction of an object experiences as it moves through space

Question 2

Lamina

Answer 2

An object with one dimension, such as a sheet of metal. It’s mass is evenly distributed across a flat surface

Question 3

Rod

Answer 3

An object with one dimension, such as a pole or a beam. Its mass is distributed along a straight line. It is rigid

Question 4

Light

Answer 4

Its mass is very small, as such as a string or pulley. The tension is the same at both ends of a light string

Question 5

Smooth

Answer 5

This assumes there is no friction between this surface and an object

Question 6

Rough

Answer 6

This takes into account friction on surfaces

Question 7

Wire

Answer 7

A rigid, thin length of metal, treated as one dimensional, either smooth or rough

Question 8

Particle

Answer 8

Dimension of the object are negligible. Its mass is concentrated at a single point. Air resistance and rotational forces can be ignored

Question 9

Uniform body

Answer 9

Its mass is evenly distributed. It’s mass is concentrated as the geometrical centre of the body

Question 10

Gravity

Answer 10

The force of attraction to the Earth, measured at 9.8ms. It is uniform and acts vertically downwards

Question 11

Inextensible

Answer 11

Does not stretch under a load. Acceleration is constant in objects connected by a taut inextensible string

Question 12

Name the key words

Answer 12

Air resistance
Laminate
Rod
Light
Smooth
Wire
Rough
Particle
Uniform body
Gravity
Inextensible