Fig. 2.1 shows a student carrying out a press-up. An upward total force $F$ acts on his hands, and an upward force also acts on his toes. The student’s weight is 600 N, and this force acts downward through his centre of mass.
(a(i))[1]
Explain why work is done by the student as his body rises from the ground.
(a(ii))[1]
State the type of energy that the student uses to do this work.
(b(i))[1]
At the point shown in Fig. 2.1, the student is at rest. The student’s weight produces a moment about his toes. Calculate the moment of the weight of the student about his toes.
(b(ii))[2]
Calculate the magnitude of the force $F$.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A force acts through a distance in the same direction” …