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JAMB Physics 2019 past questions and answers

2 questions. Try each one, then open the answer to check yourself and read the explanation.

Question 14

Equilibrium of Forces

A uniform metre rule QR is balanced on a knife edge which is 55cm from R. When a mass of 10g is hung at P as shown below, the mass of the metre rule is

Diagram for this question
  1. A.70g
  2. B.350g
  3. C.550g
  4. D.35g
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Answer: A (70g)

Explanation

The pivot is 45 cm from Q and the 10 g mass hangs 10 cm from Q, i.e. 35 cm from the pivot. The rule's weight acts at 50 cm, 5 cm the other side. 10 × 35 = m × 5, so m = 70 g.

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Question 23

Newton's Laws and Momentum

The value of T in the diagram is

Diagram for this question
  1. A.10.0 N
  2. B.40.0 N
  3. C.20.0 N
  4. D.111.8 N
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Answer: C (20.0 N)

Explanation

The vertical parts of the two equal tensions hold up the 20 N weight: 2T sin 30° = 20, so T × 1 = 20 and T = 20.0 N.

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