Using vector to work out the component of the acceleration acting parallel to a bannister

The bannister's is inclined at 30 degree. Determine the exit velocity from a 10 m long bannister which is frictionless.


Why does a force not do any work if it's perpendicular to the motion?

I have a book that says the Moon's orbit is [in this context assumed to be] circular. The Earth does no work on the moon. The gravitational force is perpendicular to the motion. Why is there no... more


Physics statics calculations

The question is : A metre rule of weight 1.0N is pivoted on a knife-edge at its centre of mass, supporting a weight of 5.0N and an unknown weight W. To balance the rule horizontally with the... more

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