A-Level Physics OCR A H556

5.4.2: Newtons law of gravitation

#5.4.2a

Newton’s law of gravitation; $F = -\dfrac{GMm}{r^2}$ for the force between two point masses

#5.4.2b

gravitational field strength $g = -\dfrac{GM}{r^2}$ for a point mass

#5.4.2c

gravitational field strength is uniform close to the surface of the Earth and numerically equal to the acceleration of free fall.

5.4.1

Point and spherical masses

5.4.3

Planetary motion