Mechanics questions | form five Physics

1. Define the term tangential velocity.
2. Explain why the astronaut appears to be weightless when travelling in the space vehicle.

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1. State Newton’s law of gravitation.
2. Use the law stated in (i) to derive Keppler’s third law.

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1. Briefly explain why Newton’s equation of universal gravitation does not hold for bodies falling near the surface of the earth?
2. Show that the total energy of a satellite in a circular orbit equals half its potential energy.

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1. What would be the length of a day if the rate of rotation of the Earth were such that the acceleration due to gravity ​ g ​ = 0 at the equator?
2. Calculate the height above the Earth’s surface for a satellite in a parking orbit.

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Outline the motions that add up to make projectile motion.

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