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AQA - A Level Physics - Mechanics and Materials #3

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Quiz by Nighthawk
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Last updated: July 8, 2020
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First submittedJuly 8, 2020
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Hint
Answer
On a force-distance graph the area under the line represent
work done
Give the equation for Energy stored in a stretched spring
½ F×∆L
Give the equation for Kinetic Energy
½ m v²
Base units equivalent to a Joule
kg m² s⁻²
Give the equation for Change in gravitational potential energy
m g ∆h
Define Hooke's Law
The change in length of an object is directly proportional to the applied force.
Define the Elastic limit
The point at which a material starts to permanently change shape
What is a compressive force
A force that reduces the length of an object
The units of stress
Pascals (Pa) or Nm^-2
Define density
Mass per unit volume
What is the density of water
1000kgm⁻³
State Hooke's Law equation
F = -kx
What is the effect of connecting two identical springs in series
Halve the stiffness/k
Hint
Answer
What is the effect of connecting two identical springs in parallel
Double the stiffness/k
Define the Limit of proportionality
The point at which a material stops obeying Hooke's Law
Define Young's Modulus
Stress / Strain (within the limit of proportionality)
What is the Material property measured by the Young's Modulus
Stiffness
Define Ultimate tensile strength
The maximum stress a material can withstand before breaking
What is the Feature of a stress-strain graph that tells you the Young's Modulus
The gradient (of the initial straight line section)
Define the yield point
The point when strain starts to increase very rapidly with stress.
Define Elastic deformation
Material returns to its original shape when the load is removed
Define Plastic deformation
Material remains permanently deformed after the load is removed.
What is shown by the Area under a force-extension graph
Work done stretching the material/energy stored in a spring
Define Tensile Strain
Change in length per unit original length
Define Tensile stress
Tensile force divided by cross-sectional area
What has the same units as stress
Young's Modulus or Pressure
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