| Date | May 2012 | Marks available | 1 | Reference code | 12M.1.SL.TZ2.19 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 19 | Adapted from | N/A |
Question
A particle of mass m is a distance R from the surface of Earth of mass M. The force acting on the particle is F. Which of the following is the gravitational field strength at R?
A. \(\frac{{Gm}}{{{R^2}}}\)
B. \(\frac{{GmM}}{{{R^2}}}\)
C. \(\frac{F}{m}\)
D. \(\frac{F}{M}\)
Markscheme
C
Examiners report
B was the most popular choice despite it clearly representing a force, rather than field strength. The field strength at a point is the acceleration of a mass placed at the point, so clearly C is the correct response.
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