They’re using a linear friction welding machine which oscillates the sample at about 200hz. Their best guess is linen lignin cells within the wood are melting, interlocking and rejoining ...

Students could try to recreate this fun 'friction book' activity in class, possibly as a strength test between groups of students. They could also give additional examples of uses in friction in ...

As the sample moves under the tip at velocity v, friction forces (F) between the tip and the sample cause the cantilever to twist. The amount of twisting, measured by the displacement (x) of the tip ...

In addition testing rigs can take numerous geometries but generally take the form of a loaded probe that impinges the sample that travels in a circular or reciprocating fashion. Friction can be ...

Edexcel questions courtesy of Pearson Education Ltd. B The friction forces are bigger than the forward force C The friction forces are smaller than the forward force D The friction forces are the ...