#### Centre of mass

In finite objects, the total external force equals the total mass times the acceleration of a point called the centre of mass.

More details | Watch now#### Circular motion

Uniform circular motion: angular displacement and velocity are introduced and centripetal acceleration is determined.

More details | Watch now#### Energy and power

The total work done on an object equals the increase in its kinetic energy. For conservative forces, we can define potential energy.

More details | Watch now#### Gravity

The inverse square law explains planetary motion - and apples falling. Newton's law, measuring G, calculating orbits.

More details | Watch now#### Life in Space

Helen Sharman, the UK's first astronaut, gives a vibrant account of her personal experience of life in space using models and film to illustrate the key scientific concepts involved in spaceflight. Among other things she discusses the way Newton's Th....

More details | Watch now#### Momentum

p=mv. If external forces are zero, momentum is conserved. In collisions, energy may be conserved (elastic) or not (inelastic).

More details | Watch now#### Motion with constant acceleration (kinematics)

Kinematics quantifies motion without explaining the causes of it. Here we study accelerations that are zero, positive or negative.

More details | Watch now#### Newton’s laws of motion

F=ma (laws 1&2). Forces come in pairs that add to zero (3). Newton's laws apply in inertial frames of reference. Some common approximations made in applying them.

More details | Watch now#### Oscillations

Inertia and restoring forces can, with low friction or damping, lead to oscillations and resonance. We analyse the mechanics of vibrations.

More details | Watch now#### Projectile motion

Motion with uniform acceleration, such as in a uniform gravitational (or electric) field is projectile motion, analysed here with examples.

More details | Watch now#### Rotation

Torques produce angular acceleration, moment of inertia 'resists' it. Rotational kinetic energy and angular momentum.

More details | Watch now#### Simple harmonic motion

In simple harmonic motion, displacement, velocity and acceleration vary sinusoidally with time, but with different phases.

More details | Watch now