IAL M1 assessment of understanding Ch1

Match the following models and the corresponding modelling assumptions

• mass of the object is concentrated at the centre of mass

• uniform body

• rigid

• light object

• mass of the object is concentrated at a single point

• inextensible string

• acceleration is the same in objects connected by a taut inextensible string

• rod

• having zero mass

• particle

Match the following models and the corresponding modelling assumptions

• treated as one-dimension

• rod

• no friction between the surface and any object on it

• particle

• no thickness

• light object

• rotational forces and air resistance can be ignored

• wire

• tension the same at both ends of a light string

• smooth surface

Match the following models and the corresponding modelling assumptions

• mass is concentrated along a line

• air resistnace

• usually modelled as being negligible

• pulley

• has no mass

• rough surface

• mass is distributed across a flat surface

• lamina

• objects in contact experience a frictional force if they are moving or acted on by a force

• rod

Match the following forces and the corresponding definitions

• the force acting on the object when it is being pulled along by a string

• thrust

• acts vertically downwards

• weight

• the force which acts perpendicular to a surface when an object is in contact with it

• friction

• the force acting on the object when is it is being pushed along

• tension

• a force which opposes the motion between two rough surfaces

• normal reaction

Match the following terms and the forces acting on an object

• gravitational force acing downward

• drag

• air resistance opposes motion

• weight

• forward thrust

• thrust

• upward thrust

• buoyancy

• the upward force that allows an object to float or rise when submerged in a liquid

• lift