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BBC Bitesize, [1] also abbreviated to Bitesize, is the BBC's free online study support resource for school-age pupils in the United Kingdom. It is designed to aid pupils in both schoolwork and, for older pupils, exams .
All four known fundamental interactions are non-contact forces: [2] Gravity , the force of attraction that exists among all bodies that have mass . The force exerted on each body by the other through weight is proportional to the mass of the first body times the mass of the second body divided by the square of the distance between them.
The fictitious forces that must be combated are the Coriolis force (first term) and the centrifugal force (second term). (These terms are approximate. [47]) By applying forces to counter these two fictitious forces, the rotating observer ends up applying exactly the same forces upon the walker that the inertial observer predicted were needed.
A static equilibrium between two forces is the most usual way of measuring forces, using simple devices such as weighing scales and spring balances. For example, an object suspended on a vertical spring scale experiences the force of gravity acting on the object balanced by a force applied by the "spring reaction force", which equals the object ...
The forces acting on a body add as vectors, and so the total force on a body depends upon both the magnitudes and the directions of the individual forces. [ 23 ] : 58 When the net force on a body is equal to zero, then by Newton's second law, the body does not accelerate, and it is said to be in mechanical equilibrium .
The BBC Forces Programme was a national radio station which operated from 7 January 1940 until 26 February 1944, ... BBC Year Book 1947. London: British Broadcasting ...
In the inertial frame of reference (upper part of the picture), the black ball moves in a straight line. However, the observer (red dot) who is standing in the rotating/non-inertial frame of reference (lower part of the picture) sees the object as following a curved path due to the Coriolis and centrifugal forces present in this frame.
The School Broadcasting Council for the United Kingdom had been set up in 1947, replacing the CCSB, and included Scotland and Wales. In 1953, 25,691 British schools were registered for school radio; 9.55am, 11am and 2pm were for primary schools; 11.20am, 2.20pm and 2.40pm were for secondary modern schools; 11.40am was for grammar schools.