In this question use g=9.8g = 9.8g=9.8 m s−2^{-2}−2.
A woman of mass 60 kg stands on the floor of a lift.
The lift accelerates vertically upwards at 1.2 m s−2^{-2}−2. Find the magnitude of the normal reaction of the floor on the woman.
The lift later moves vertically downwards and decelerates at 0.9 m s−2^{-2}−2. Find the magnitude of the normal reaction of the floor on the woman.
139 exam-style questions on AQA A Level Maths 3.3 R: Forces and Newton's laws, covering 3.3.1 Concept of a force and Newton's first law, 3.3.2 Newton's second law, 3.3.3 Weight and motion under gravity, 3.3.4 Newton's third law and equilibrium, 3.3.5 Addition of forces and resultants (A-level only), and 3.3.6 Friction (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.