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Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
vectors and scalars [vector] is the rate of change of [scalar]
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
centre of mass the point on a body through which a single force on the
body has no turning effect
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
moment moment \(=\) force \(\times\) perpendicular
distance from the point to the line of action of the force
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
moment of a couple moment of a couple \(=\) force \(\
times\) distance between points
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
principle of moments \(\sum\)clockwise moments \(=\sum\)anticlockwise
moments
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
terminal velocity <ul><li>highest velocity an object will
reach</li><li>resultant force = 0</li></ul>
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
Newton's First Law """Objects either stay at rest or move with a
constant velocity unless acted upon by a force"""
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
Newton's Second Law force \(=\) mass \(\
times\) acceleration
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
Newton's Third Law every action has an equal and opposite reaction
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
\(g\) <ul><li>gravitational field strength at given
position \((N)\)</li><li>acceleration due to
gravity \((ms^{-2})\)</li><li>Earth = 9.81<br>Moon = 1.62</li></ul>
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
newton (N) the amount of force that will give an object of 1kg mass and
acceleration of 1ms<sup>-2</sup>
Physics::Paper 1::Unit 4: Mechanics and Materials::4.2: Materials Hooke's Law
"<ul><li>""The force needed to stretch a spring is directly proportional to
the extension of the string from its natural length""</li><li>rubber doesn't follow
Hooke's Law</li><li>work done to stretch string \(=\frac12F\Delta
L\)</li><li>gravitational potential energy stored in string \(=\frac12k\Delta
L^2\)</li></ul>"
Physics::Paper 1::Unit 4: Mechanics and Materials::4.2: Materials Young
Modulus (E) <ul><li>stiffness of a material</li><li>\(\frac{tensile~stress}
{tensile~strain}=\frac{\sigma}{\varepsilon}=\frac{FL}{A\Delta L}\)<br></li></ul>
#html:true
#deck column:1
#tags column:4
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
vectors and scalars [vector] is the rate of change of [scalar]
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
centre of mass the point on a body through which a single force on the
body has no turning effect
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
moment moment \(=\) force \(\times\) perpendicular
distance from the point to the line of action of the force
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
moment of a couple moment of a couple \(=\) force \(\
times\) distance between points
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
principle of moments \(\sum\)clockwise moments \(=\sum\)anticlockwise
moments
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
terminal velocity <ul><li>highest velocity an object will
reach</li><li>resultant force = 0</li></ul>
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
Newton's First Law """Objects either stay at rest or move with a
constant velocity unless acted upon by a force"""
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
Newton's Second Law force \(=\) mass \(\
times\) acceleration
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
Newton's Third Law every action has an equal and opposite reaction
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
\(g\) <ul><li>gravitational field strength at given
position \((N)\)</li><li>acceleration due to
gravity \((ms^{-2})\)</li><li>Earth = 9.81<br>Moon = 1.62</li></ul>
Physics::Paper 1::Unit 4: Mechanics and Materials::4.1: Force, energy and momentum
newton (N) the amount of force that will give an object of 1kg mass and
acceleration of 1ms<sup>-2</sup>
Physics::Paper 1::Unit 4: Mechanics and Materials::4.2: Materials Hooke's Law
"<ul><li>""The force needed to stretch a spring is directly proportional to
the extension of the string from its natural length""</li><li>rubber doesn't follow
Hooke's Law</li><li>work done to stretch string \(=\frac12F\Delta
L\)</li><li>gravitational potential energy stored in string \(=\frac12k\Delta
L^2\)</li></ul>"
Physics::Paper 1::Unit 4: Mechanics and Materials::4.2: Materials Young
Modulus (E) <ul><li>stiffness of a material</li><li>\(\frac{tensile~stress}
{tensile~strain}=\frac{\sigma}{\varepsilon}=\frac{FL}{A\Delta L}\)<br></li></ul>
