Department of Physics, Unit Catalogue 2006/07 
PH10004 Dynamics, relativity & gravity 
Credits: 6 
Level: Certificate 
Semester: 2 
Assessment: EX 100% 
Requisites: 
Before taking this unit you must take PH10007 
or equivalent.
Aims: The aims of this unit are to present students with a clear guide to the laws of dynamics and gravity, to strengthen their understanding of the universality of concepts from mechanics (from fundamental particles to billiard balls to planets) and to introduce them to relativity and relativistic mechanics.
Learning Outcomes: After taking this unit the student should be able to: * conserve linear and angular momentum in collisions; * use vector notation and methods to solve problems in rotational dynamics; * appreciate the difference between orbital and spin angular momentum; * write down the essential results and formulae of special relativity; * describe the important special relativity experiments (real or thought); * solve simple kinematic and dynamical special relativity problems. Skills: Numeracy T/F A, Problem Solving T/F A. Content: Newton's laws of motion (9 hours): Motion in 1D and 2D with constant and nonconstant acceleration. Linear momentum, collisions, rockets. Work and energy; potential energy (potential wells and barriers), conservative and nonconservative forces. Circular motion. Rigid body rotation; moments of inertia, torque and angular momentum as vectors, equations of motion of rotating bodies, gyroscopes. Separation of orbital and spin angular momentum. Use of integration to find centres of mass and moments of inertia. Gravitation (4 hours): Gravitational force and potential energy. Weight and mass. Circular orbits; Kepler's Laws; planetary motion. Escape velocity. Newtonian cosmology. Special relativity (7 hours): Galilean transformation. MichelsonMorley experiment. Einstein's postulates. Simultaneity; time dilation, space contraction, invariant intervals, rest frames, proper time, proper length. Lorentz transformation. Relativistic momentum, force, energy. Doppler effect. General relativity (2 hours): Gravity and geometry. The principle of equivalence. Deflection of light; curvature of space. Gravitational time dilation. 
