A powered camera dolly is tested twice while carrying the same equipment, so its mass is constant. The size of its measured acceleration increases from 1.0 m s−21.0\ \mathrm{m\,s^{-2}}1.0 ms−2 to 2.5 m s−22.5\ \mathrm{m\,s^{-2}}2.5 ms−2.
How does the size of the resultant force on the dolly change?
It increases to 2.5 times its original value.
It increases to 1.5 times its original value.
It cannot be determined unless its mass is measured.
It increases by a force of 2.5 N2.5\ \mathrm{N}2.5 N.
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.