A parachutist has reached a first terminal velocity before opening a parachute. Consider the motion from just before opening until a new terminal velocity is reached.
Explain the changes in resultant force, acceleration and speed throughout this sequence.
[6 marks]
6 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A student must determine the density of an irregular metal nut that sinks in water and does not dissolve. The nut fits fully inside a measuring cylinder.
Plan a method that measures density and controls the main measurement errors.
[6 marks]
6 marksHigher
Spec and skills
Original practice question
Answer and supported method checks
A simple motor has a rectangular current-carrying coil between two magnet poles. A student suggests increasing current, using stronger magnets and making the active sides parallel to the magnetic field to increase rotation.
Evaluate these suggestions using the motor effect. Explain the role of the two sides of the coil.
[6 marks]
5 marksHigher
Spec and skills
Original practice question
Answer and supported method checks
A simplified early atomic model placed electrons inside a spread-out positive charge. Later scattering evidence supported a small positive nucleus. Further work showed that electrons occupy particular energy levels and that nuclei contain neutrons.
Evaluate the claim that changing the atomic model shows that scientific models are useless.
[5 marks]
6 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
Two sealed objects are the same size. One contains a permanent bar magnet and the other an unmagnetised iron bar. You have a third, labelled bar magnet, a plotting compass and paper.
Plan a sequence of tests to distinguish the objects and map the field of the permanent magnet.
