JAMB Physics questions: Friction

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

1. Question 1· Friction· JAMB

   A box presses on the floor with a normal reaction of 50 N. If the coefficient of friction is 0.4, find the limiting friction.

   • A20 N
   • B125 N
   • C50.4 N
   • D12.5 N

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2. Question 2· Friction· JAMB

   Compared with the limiting (static) friction between two surfaces, the kinetic (sliding) friction is

   • Azero
   • Bgreater
   • Cequal
   • Dsmaller

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3. Question 3· Friction· JAMB

   A 20 kg box is pulled across a level floor at constant speed by a horizontal force of 60 N. Find the coefficient of kinetic friction. [g = 10 m/s²]

   • A0.6
   • B3.3
   • C0.3
   • D1.2

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4. Question 4· Friction· JAMB

   A 5 kg block is pulled along a floor by a horizontal force of 30 N against a friction force of 10 N. Find its acceleration.

   • A2 m/s²
   • B6 m/s²
   • C4 m/s²
   • D8 m/s²

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5. Question 5· Friction· JAMB

   A block of weight 40 N on a horizontal surface just starts to move when a horizontal force of 12 N is applied. Find the coefficient of static friction.

   • A28
   • B3.3
   • C0.48
   • D0.3

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6. Question 6· Friction· JAMB

   Ball bearings reduce friction because

   • Athey add weight
   • Bthey increase the normal reaction
   • Cthey make surfaces rough
   • Drolling friction is less than sliding friction

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7. Question 7· Friction· JAMB

   A block just begins to slide down a plane inclined at angle θ to the horizontal. The coefficient of static friction is

   • Atan θ
   • Bsin θ
   • Ccos θ
   • D1/tan θ

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8. Question 8· Friction· JAMB

   An advantage of friction is that it

   • Aslows down vehicles unnecessarily
   • Bcauses wear of machine parts
   • Cwastes energy as heat
   • Denables us to walk without slipping

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9. Question 9· Friction· JAMB

   Which of the following reduces friction between moving parts?

   • Aincreasing the normal reaction
   • Broughening the surfaces
   • Clubrication
   • Dremoving ball bearings

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