Physics Practice Tests – Moment of a Force (Questions with Answers and Explanations)

In the diagram shown, the moment of the 5 N force about the point X is _____

A rod PR is balanced on a pivot at the end R while a string is used to support the rod at P as shown in the diagram above. The weight of the rod, 9 N, acts at a point Q where QR is 30 cm and PQ is 15 cm. The tension T in the string is _____

Weights of 0.2 N and 0.5 N are placed at the 30 cm and 80 cm marks respectively on a uniform metre rule. If the meter rule balances horizontally on a knife edge at the 60 cm mark, the weight of the metre rule is ____

A. 0.1 N
B. 0.3 N
C. 0.4 N
D. 0.7 N

A uniform metre rule of mass 100 g balanced at the 40 cm mark when a mass Q was placed at the 10 cm mark. Find the value of Q. (NECO 2014)

A. 25.0 g      B. 30.0 g     C. 33.3 g      D. 133.3 g

A metre rule pivoted at its centre has masses m1 and m2 placed at the 20 cm and 65 cm marks respectively. If the metre rule balances horizontally, the ratio  is _____

A. 2    B.     C.     D.