Moment (definition)
The moment of a force is the product of a force and the perpendicular distance from the pivot
Conditions Needed for Equilibrium
- no net force
- no net moment
Principle of Moments
For an object to be in rotational equilibrium the sum of the clockwise moments must equal the sum of the anticlockwise moments (i.e. no net moment)
Couples (definition)
A couple consists of two antiparallel (parallel but act in opposite directions) force of equal magnitude with a perpendicular distance between them
Torque (3)
- The turning effect of a couple
- One of the forces multiplied by the perpendicular distance between the forces
- Always the same no matter where the pivot is
Centre of Mass (definition)
The single point at which the mass of an object appears to act
Centre of Gravity (definition)
The single point at which the weight of an object appears to act
If a force doesn’t act directly through the object’s centre of mass…
the object will move with an added rotation
Stability (2)
- For an object to be stable, its centre of mass must be above its base
- The lower the centre of mass/the wider the base area, the more stable
As an object turns from horizontal to vertical the size of it moment
decreases to zero
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GCSE Equations - All34
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Module 1 - 1.1.1 Planning2
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Module 1 - 1.1.2 Implementing1
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Module 1 - 1.1.3 Analysing3
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Module 1 - 1.1.4 Evaluation1
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Module 2 - 2.1.1 Physical Quantities2
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Module 2 - 2.1.2 SI Units9
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Module 2 - 2.2.1 Measurements and Uncertainties9
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Module 2 - 2.3.1 Nature of Quantities2
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Module 3 - 3.1.1 Kinematics7
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Module 3 - 3.1.2 Linear Motion7
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Module 3 - 3.1.3 Projectile Motion1
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Module 3 - 3.2.1 Dynamics6
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Module 3 - 3.2.2 Motion with Non-Uniform Acceleration3
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Module 3 - 3.2.3 Equilibrium10
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Module 3 - 3.2.4 Density and Pressure6
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Module 3 - 3.3.1 Work and Conservation of Energy5
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Module 3 - 3.3.2 Kinetic and Potential Energies1
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Module 3 - 3.3.3 Power1
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Module 3 - 3.4.1 Springs11
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Module 3 - 3.4.2 Mechanical Properties of Matter11
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Module 3 - 3.5.1 Newton's Laws of Motion6
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Module 3 - 3.5.2 Collisions4
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Module 4 - 4.1.1 Charge7
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Module 4 - 4.1.2 Mean Drift Velocity10
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Module 4 - 4.2.2 E.m.f. and P.d.8
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Module 4 - 4.2.3 Resistance6
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Module 4 - 4.2.4 Resistivity6
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Module 4 - 4.2.5 Power3
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Module 4 - 4.3.1 Series and Parallel Circuits2
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Module 4 - 4.3.2 Internal Resistance6
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Module 4 - 4.3.3. Potential Dividers1
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Module 4 - 4.4.1 Wave Motion20
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Module 4 - 4.4.2 Electromagnetic Waves11
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Module 4 - 4.4.3 Superposition9
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Module 4 - 4.4.4 Stationary Waves8
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Module 4 - 4.5.1 Photons3
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Module 4 - 4.5.2 The Photoelectric Effect8
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Module 4 - 4.5.3 Wave-Particle Duality1
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Mock Revision - ignore49
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Astrophysics - ignore37
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Module 5 - 5.1.1 Temperature9
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Module 5 - 5.1.2 Solid, Liquid and Gas14
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Module 5 - 5.1.3 Thermal Properties of Materials3
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Module 5 - 5.1.4 Ideal Gases11
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Module 5 - 5.2.1 Kinematics of Circular Motion3
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Module 5 - 5.2.2 Centripetal Force7
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Module 5 - 5.3.1 Simple Harmonic Oscillations6
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Module 5 - 5.3.2 Energy of a Simple Harmonic Oscillator2
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Module 5 - 5.3.3 Damping14
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Module 5 - 5.4.1 Point and Spherical Masses5
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Module 5 - 5.4.2 Newton's Law of Gravitation1
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Module 5 - 5.4.3 Planetary Motion5
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Module 5 - 5.4.4 Gravitational Potential and Energy9
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Module 5 - 5.5.1 Stars24
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Module 5 - 5.5.2 Electromagnetic Radiation From Stars30
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Module 5 - 5.5.3 Cosmology31
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Module 5 - Detailed Sections of Astrophysics17
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Module 6 - 6.1.1 Capacitors9
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Module 6 - 6.1.2 Energy5
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Module 6 - 6.1.3 Charging and Discharging Capacitors9
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Module 6 - 6.2.1 Point Spherical Charges4
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Module 6 - 6.2.2 Coulomb's Law4
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Module 6 - 6.2.3 Uniform Electric Field2
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Module 6 - 6.2.4 Electrical Potential and Energy8
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Module 6 - 6.3.1 Magnetic Fields16
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Module 6 - 6.3.2 Motion Of Charged Particles8
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Module 6 - 6.3.3 Electromagnetism19
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Module 6 - 6.4.1 The Nuclear Atom12
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Module 6 - 6.4.2 Fundamental Particles14
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Module 6 - 6.4.3 Radioactivity17
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Module 6 - 6.4.4 Nuclear Fission and Fusion15
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Module 6 - 6.5.1 Using X-Rays13
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Module 6 - 6.5.2 Diagnostic Methods in Medicine8
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Module 6 - 6.5.3 Using Ultrasound18
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Module 3 Practicals8
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Module 4 Practicals15
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Module 5 Practicals10
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Module 6 Practicals9
