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15 Cards in this Set
- Front
- Back
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Tells us how resistive an object is to a force |
Inertial mass, m=F/a |
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It tells us about the attractive force an object will experience due to another |
Gravitational mass, m=r^2F/GM |
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The principle of equivalence states that |
Mass inertia = mass gravitational |
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Is weight larger at the North Pole or at the equator and why |
It is large at the North Pole as at the equator there is an opposing radial acceleration which gives a lower recording of weight |
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Calculate g... |
g=GM/r^2 |
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Explain Cavendish torsion balance |
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Potential energy formula... |
U(g) = - Gm(1)m(2)/r |
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What is the flat earth approximation |
We can use mgy to find the potential energy if we imagine flat earth and have changed the potential zero point to be at the earth's surface. Only when y<<radius(earth) |
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Kepler's first law |
The orbit of each planet around the sun is an ellipse with the sun at 1 Focus |
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Kepler's second law |
As a planet moves around it's orbit it sweeps out equal areas in equal times |
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Kepler's third law |
P^2 =a^3 |
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Newton's version of Kepler's third law |
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Satellite velocity |
V=sqrt(GM/r) |
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What is the mechanical energy of a satellite in a circular orbit? |
1/2 * U(grav) |
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Escape velocity and schwarzschild radius given by... |
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