24 results found for physics

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centre-of-mass 00:08:00

Centre of mass

by Joe Wolfe
Centre of mass
for 14-19 and upwards,
Lectures | 14-19 and upwards | 9 years ago | 830 views
Rating:

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

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circular-motion 00:08:00

Circular motion

by Joe Wolfe
Circular motion
for 14-19 and upwards,
Lectures | 14-19 and upwards | 10 years ago | 1197 views
Rating:

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

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energy-and-power 00:10:00

Energy and power

by Joe Wolfe
Energy and power
for 14-19 and upwards,
Lectures | 14-19 and upwards | 9 years ago | 750 views
Rating:

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

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geometrical-optics 00:11:00

Geometrical optics

by Joe Wolfe
Geometrical optics
for 14-19 and upwards,
Lectures | 14-19 and upwards | 6 years ago | 927 views
Rating:

On scales much bigger than the wavelength, rays explain the behaviour of interfaces, mirrors, lenses, optical instruments, including telescopes and microscopes.

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gravitation 00:12:00

Gravity

by Joe Wolfe
Gravity
for 14-19 and upwards,
Lectures | 14-19 and upwards | 8 years ago | 881 views
Rating:

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

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human-sound 00:11:00

Human Sound

by Joe Wolfe
Human Sound
for 14-19 and upwards,
Lectures | 14-19 and upwards | 7 years ago | 1347 views
Rating:

Sound is produced in the larynx; filtering it in the vocal tract produces formants and phonemes. The acoustics, mechanics and some neurobiology of hearing. Pitch perception.

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interference-and-consonance 00:08:00

Interference and consonance

by Joe Wolfe
Interference and consonance
for 14-19 and upwards,
Lectures | 14-19 and upwards | 7 years ago | 1008 views
Rating:

Superposing waves with different frequencies gives beats and Tartini tones. Removing beats gives consonance. Tuning consonances gives temperament.

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momentum 00:10:00

Momentum

by Joe Wolfe
Momentum
for 14-19 and upwards,
Lectures | 14-19 and upwards | 9 years ago | 776 views
Rating:

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

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motion-with-constan-acceleration-kinematics 00:06:00

Motion with constant acceleration (kinematics)

by Joe Wolfe
Motion with constant acceleration (kinematics)
for 14-19 and upwards,
Lectures | 14-19 and upwards | 10 years ago | 1028 views
Rating:

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

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newtons-laws 00:10:00

Newton’s laws of motion

by Joe Wolfe
Newton’s laws of motion
for 14-19 and upwards,
Lectures | 14-19 and upwards | 9 years ago | 811 views
Rating:

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.

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oscillations 00:09:00

Oscillations

by Joe Wolfe
Oscillations
for 14-19 and upwards,
Lectures | 14-19 and upwards | 8 years ago | 725 views
Rating:

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

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projectile-motion 00:09:00

Projectile motion

by Joe Wolfe
Projectile motion
for 14-19 and upwards,
Lectures | 14-19 and upwards | 10 years ago | 691 views
Rating:

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

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