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

Hello and Welcome to Physics Practice Tests – Moment of a Force

1. You are to attempt 5 random objectives questions ONLY.
2. Supply Your Full Name and Location in the text box below and begin immediately.
3. You can attempt as many times as possible

From the diagram above, determine the moment of the 200 N force at O about K.
[cos 45o = $\dpi{110}\frac{1}{\sqrt{2}}$ , Sin 45o = $\dpi{110}\frac{1}{\sqrt{2}}$ ] (NECO 2023)

A. $\dpi{110}\frac{5}{\sqrt{2}}$ Nm      B. $\dpi{110}\frac{10}{\sqrt{2}}$ Nm      C. $\dpi{110}5\sqrt{2}$ Nm      D. $\dpi{110}\frac{200}{\sqrt{2}}$ Nm

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 rod of weight 40 N has a piece of metal of weight 20 N attached to one of its ends. The centre of gravity of the system from the weighted end is _______

A. 8.4 cm
B. 16.7 cm
C. 25.0 cm
D. 33.3 cm

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 _____

A. 3 N
B. 6 N
C. 9 N
D. 12 N

A uniform beam of length 4 m and mass 20 kg is supported at both ends. A girl of mass 40 kg stands on the beam at a distance of 1.5 m from one of the supports. The reactions at the supports are _______

A. 150 N, 250 N
B. 200 N, 200 N
C. 250 N, 350 N
D. 300 N, 300 N

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