Friction

Friction

• What is friction, limiting equilibrium and the coefficient of friction?
  • friction example 1
  • friction example 2
• Exam Questions

Equlibrium of a rigid body

Moments

• What is the moment of a force?
• Horizontal rods / planks / beams in equilibrium resting on :

• one support
• two supports
• Tilting
  • Tilting example

• Exam Questions (1)

• Forces at an Angle
  • Moment of a non-perpendicular force
• Ladder type problems
  • Ladder leaning against a smooth wall and floor
  • Ladder leaning against a smooth wall but on a rough floor
• Exam Questions (2)

• Couples (still to be completed)

Centre of mass

Particles

• Centre of mass of a system of particles in a line
• Centre of mass of a system of particles in a plane

Uniform Laminas

• Centre of mass of a uniform lamina that has lines of symmetry
• Triangular laminas
• Sectors and semi-circles

Composite Laminas

• rectangles
• rectangle + triangle
• rectangle + semi-circle
• rectangle with circle removed

Wire Frameworks

• Wire framework consisting of a rectangle and triangle

Hanging Problems

• Freely suspended lamina

Toppling Problems

• Lamina on an inclined plane

Exam Questions

• Exam Questions

3-Dimensional Examples

• (Still to be done)

Work, energy and power

Work done by a force acting on a particle :

• moving in the horizontal plane, against friction and inclined to the horizontal
• moving in the vertical plane against gravity
• moving up a rough inclined plane against friction and against gravity

Energy

• Gravitational potential energy
• Kinetic energy
• Conservation of energy / work energy principle

Conservation of mechanical energy / Work-Energy Principle

• Vertical motion
• Motion down a smooth plane
• Motion down a rough plane
• Motion down an undulating slope

Power

• Introduction + example : car moving with constant speed horizontally then up a hill
• Car accelerating along the horizontal and then up a hill

Exam Questions

• Exam Questions

Momentum and Impulse

Momentum and impulse

• Two particles colliding and then separating
• Two trucks colliding and moving off as one particle
• A bullet being fired from a gun
  • Exam Questions
• Impulse
  • Exam Questions

Impulse (Vector form)

• Impulse in vector form
• Exam Questions

Newtons Experimental Law of Restitution

• Newtons experimental law (still to be completed but explained in the exam quest.)
• Exam Questions

Oblique Impact with a smooth wall

• (Still to do)

Frameworks

Frameworks

• (Still to do)