CIE iGCSE Co-Ordinated Science P1.5.2 Turning effect of forces Exam Style Questions Paper 1
Question
The diagram shows a metre rule with a pivot at the 60 cm mark. A force of 6.0 N is applied at the
35 cm mark in the direction shown.
What is the moment of the 6.0 N force about the pivot?
A 150 Ncm B 210 Ncm C 360 Ncm D 390 Ncm
▶️Answer/Explanation
Ans :A
Question
A uniform plank is placed on a pivot, with its centre immediately above the pivot. A load of 10 N is suspended on the left, 45 cm from the pivot, and a load of 20 N is suspended on the right, 45 cm from the pivot.
What happens to the plank?
A The left-hand side moves down, the right-hand side moves up and the plank does not return
to its horizontal position.
B The left-hand side moves up, the right-hand side moves down and the plank does not return
to its horizontal position.
C The plank moves down on one side then returns to its horizontal position.
D The plank remains horizontal without moving.
▶️Answer/Explanation
Ans : B
Question
A force of 10 N is applied to a beam at a distance of 0.25 m from a pivot.
Which calculation gives the moment of the force about the pivot in N m?
(A) 10 × 0.25
(B) $\frac{10}{0.25}$
(C) 10 + 0.25
(D) 10 – 0.25
▶️Answer/Explanation
Ans : A
Question
What is a suitable unit for the moment of a force?
A Nkg B N/ kg C N m D N/ m
▶️Answer/Explanation
Ans : C