1.1 What is friction? Take this everyday example: when a coffee mug rests on a flat table, the kinetic frictional force is zero. There is no force trying to move the mug across the table, so there is ...

Frictional forces play a role in many activities – riding a bike, going bowling, and even lighting a match. When two surfaces rub together they create friction, which works to slow movement down. In ...

Unbalanced forces are generally due to a forward force (or thrust) and a frictional force working against each other. Friction is a force that opposes motion. It is present whenever two surfaces rub ...

You’re not just imagining it, objects really are harder to shift the longer they sit there. A pair of scientists think they have discovered why. Have you ever had the impression that heavy items of ...

Irregularities present on a surface are often described as surface roughness or texture. These surface textures such as grooves and dimples impart friction, which is the force between two sliding ...

Figure 1: Lateral force versus nominal lateral displacement data for typical SA-SHS tests after stationary holds at 60% RH. Although the unusually large ageing effect at the single-asperity level ...