JAMB Physics questions: Equilibrium of forces

14 questions with answers and explanations. Tap an option to check yourself.

1. Question 1· Equilibrium of forces· JAMB

   The centre of gravity of a uniform rod is at its

   • Aheavier end
   • Bmidpoint
   • Clighter end
   • Done-quarter point

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2. Question 2· Equilibrium of forces· JAMB

   A uniform beam 6 m long and weighing 200 N rests on supports at its ends A and B. A 400 N load is placed 2 m from A. Find the reaction at A.

   • A300 N
   • B233.3 N
   • C366.7 N
   • D600 N

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3. Question 3· Equilibrium of forces· JAMB

   A uniform metre rule of weight 2 N is pivoted at the 30 cm mark. What weight hung at the 10 cm mark will keep it horizontal?

   • A4 N
   • B2 N
   • C1 N
   • D6 N

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4. Question 4· Equilibrium of forces· JAMB

   Two equal and opposite parallel forces of 5 N act 0.4 m apart. Find the moment of the couple.

   • A0.08 N m
   • B12.5 N m
   • C10 N m
   • D2 N m

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5. Question 5· Equilibrium of forces· JAMB

   A uniform metre rule is balanced at the 40 cm mark when a mass of 20 g is hung at the 10 cm mark. The mass of the rule is:

   • A20 g
   • B40 g
   • C80 g
   • D60 g

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6. Question 6· Equilibrium of forces· JAMB

   The centre of gravity of a uniform triangular sheet is at the

   • Apoint where its medians meet
   • Bmidpoint of its base
   • Capex
   • Dcentre of its inscribed circle

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7. Question 7· Equilibrium of forces· JAMB

   When three coplanar forces keep a body in equilibrium, they can be represented by

   • Athe radius of a circle
   • Ba straight line
   • Ctwo parallel lines
   • Dthe three sides of a triangle taken in order

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8. Question 8· Equilibrium of forces· JAMB

   A uniform metre rule balances at the 50 cm mark. A 30 N weight hangs at the 20 cm mark. What weight at the 70 cm mark keeps the rule balanced?

   • A60 N
   • B30 N
   • C20 N
   • D45 N

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9. Question 9· Equilibrium of forces· JAMB

   

   A uniform metre rule is balanced horizontally on a pivot at its 50 cm mark by the two weights shown. Find W.

   • A6 N
   • B3 N
   • C12 N
   • D8 N

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10. Question 10· Equilibrium of forces· JAMB

    A body acted on by parallel forces is in equilibrium when

    • Aonly the sum of the moments is zero
    • Bonly the sum of the forces is zero
    • Cthe sum of the forces and the sum of their moments are both zero
    • Dall the forces are equal

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11. Question 11· Equilibrium of forces· JAMB

    A body is in stable equilibrium if, when slightly displaced, its centre of gravity

    • Afalls
    • Brises
    • Cstays at the same level
    • Dmoves outside its base

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12. Question 12· Equilibrium of forces· JAMB

    A body is in unstable equilibrium if, when slightly displaced, its centre of gravity

    • Amoves upward and back
    • Brises
    • Cstays at the same level
    • Dfalls

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13. Question 13· Equilibrium of forces· JAMB

    A couple consists of

    • Atwo equal, opposite, parallel forces not in the same line
    • Btwo forces in the same direction
    • Ca single force
    • Dthree concurrent forces

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14. Question 14· Equilibrium of forces· JAMB

    A uniform beam balances at its centre. A 100 N weight hangs 1 m from the centre. How far from the centre, on the other side, must a 50 N weight hang to keep the beam balanced?

    • A4 m
    • B0.5 m
    • C1 m
    • D2 m

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