A newtonmeter has a constant zero error. It reads 1.4 N with a 0.10 kg mass and 3.8 N with a 0.30 kg mass. What is the gravitational field strength?
7 N kg−17\ \mathrm{N\,kg^{-1}}7 Nkg−1
13 N kg−113\ \mathrm{N\,kg^{-1}}13 Nkg−1
12 N kg−112\ \mathrm{N\,kg^{-1}}12 Nkg−1
14 N kg−114\ \mathrm{N\,kg^{-1}}14 Nkg−1
103 exam-style questions on Edexcel GCSE Physics 2.3 Forces and Newton's laws, covering 2.3.1 Newton's first law, 2.3.2 Newton's second law, and 2.3.3 Weight and gravitational field strength. Each one has a worked solution and a mark scheme showing where the marks go.