WAEC Physics questions: Friction

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

1. Question 1· Friction· WAEC

   Friction is useful in

   • Aproducing unwanted heat
   • Bwearing out machine parts
   • Cwalking and braking
   • Dreducing efficiency

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2. Question 2· Friction· WAEC

   Which of these increases friction between two surfaces?

   • Aoiling the surfaces
   • Broughening the surfaces
   • Cusing ball bearings
   • Dstreamlining

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3. Question 3· Friction· WAEC

   A horizontal force of 80 N keeps a 20 kg box moving steadily along a floor. Find the coefficient of friction. (g = 10 m/s²)

   • A0.4
   • B4
   • C0.25
   • D2.5

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4. Question 4· Friction· WAEC

   Friction is useful because it

   • Awears out machine parts
   • Ballows the brakes of a car to work
   • Cproduces unwanted heat
   • Dwastes energy

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5. Question 5· Friction· WAEC

   Which of the following reduces friction between moving parts of a machine?

   • ALubrication
   • BRoughening the surfaces
   • CIncreasing the load
   • DUsing sand

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6. Question 6· Friction· WAEC

   Which of these reduces friction between moving parts?

   • Aremoving the ball bearings
   • Broughening the surfaces
   • Cincreasing the normal reaction
   • Dlubricating them with oil

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7. Question 7· Friction· WAEC

   The friction acting on a body sliding over a surface is usually

   • Azero
   • Bgreater than the limiting friction
   • Cequal to its weight
   • Dless than the limiting friction

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8. Question 8· Friction· WAEC

   A block of weight 50 N needs a horizontal force of 20 N to slide at constant speed. The coefficient of kinetic friction is

   • A2.5
   • B0.4
   • C0.2
   • D70

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9. Question 9· Friction· WAEC

   A horizontal force of 12 N just moves a block of weight 40 N on a level floor. Find the coefficient of static friction.

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

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   Explanation and discussion