AS-LEVEL: Bulk Properties of Solids QP (PMT AQApre2016)) Flashcards
Define the moment of a force about a point.
(2 marks)
-turning effect of a force
-moment = force * perpendicular distance between pivot and line of action
An aerospace engineer has built two differently designed wings. One wing is made from an aluminium alloy and the other is made from a carbon fibre composite.
The engineer tests a sample of each material by applying a varying stress.
Tick (✓) two of the boxes in the table below to indicate which are properties of the
material from which the wing is made. (1)
A) Breaking stress
B) Stiffness constant, k
C) Tensile strain
D) Tensile stress
E) Young Modulus
A & E
The bungee jump operator intends to use a bungee rope of the same unextended length but with a much greater stiffness. The rope is to be attached in the same way as before.
Explain, with reference to the kinetic energy of the jumper, any safety concerns that may arise as the jumper is slowed down by the new rope.
(3 marks)
-same kinetic energy when rope begins to stretch
-more work done per unit extension. rope stops in shorter distance
-increases force on jumper, increasing risk of injury
