Efficiency and energy resources

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Question 4
Medium

Grease is applied to the metal ball bearings inside a skateboard wheel assembly, as shown in the diagram.

A diagram of a skateboard wheel hub assembly, showing the central axle and a ring of spherical metal ball bearings. An arrow points to the contact surfaces between the bearings and the outer metal ring, labelled 'friction point where grease is applied'.

Explain how applying grease to the ball bearings improves the efficiency of the skateboard.

[3]

Efficiency and energy resources Questions

  1. GCSE
  2. /Physics
  3. /Efficiency and energy resources