A swing is formed by fastening rope loosely to the branch of a tree, as illustrated in Fig. 2.1.
A child moves backwards and forwards several times, beginning at the highest point A.
(a)[2]
Explain how a second child could make an accurate measurement of the time taken for one complete swing.
(b(i))[2]
As the child travels from A to B, she drops through a vertical height of 0.60 m. Her gravitational potential energy decreases by 240 J. The gravitational field strength $g$ is $10\,\text{N kg}^{-1}$.
Calculate the mass of the child.
(b(ii))[2]
Suggest two reasons why her kinetic energy at B does not equal 240 J.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A stopwatch or electronic timer is used” …