A cyclist's motion is opposed by friction between two surfaces in contact. State one factor that affects the size of a frictional force between two surfaces.

Model answer

mass of the objects

Also accepted: weight of the objects, nature of the surfaces, roughness of the surfaces, surface roughness

Explanation

Frictional force depends on factors such as the combined weight/mass of the objects and the nature (roughness/smoothness) of the surfaces in contact.

Derived from ZIMSEC Physics 4023/2 Paper 2 Theory, November 2019, Q1

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