Easy -1.2 This is a straightforward single-step application of Newton's second law to a lift problem. Students need only identify forces (weight and normal reaction), apply F=ma with upward acceleration, and calculate R = m(g+a). It's a standard textbook exercise requiring direct recall of the lift problem method with no problem-solving or conceptual challenges.
1 A man of mass 70 kg stands on the floor of a lift which is moving with an upward acceleration of \(0.3 \mathrm {~m} \mathrm {~s} ^ { - 2 }\). Calculate the magnitude of the force exerted by the floor on the man.
1 A man of mass 70 kg stands on the floor of a lift which is moving with an upward acceleration of $0.3 \mathrm {~m} \mathrm {~s} ^ { - 2 }$. Calculate the magnitude of the force exerted by the floor on the man.
\hfill \mbox{\textit{OCR M1 2008 Q1 [4]}}