Engine Friction

A contact force that resists sliding between surfaces.

Friction when an object slides along a surface. Direction is opposite the object’s sliding direction and is parallel to the contact surface.

Friction that prevents an object from sliding along a surface. Direction stops the object from sliding against another surface and is parallel to the contact surface.

A unit-less ratio of the frictional force to the normal force.

Surfaces have tiny microscopic ridges and bumps called?

In most of running machines friction is undesirable due to?

• energy loss

• • leading to wear of vital parts

• deteriorating performance due to heat generation

• All of the above

• Improving the mechanical properties by improved design of bearings, shafts, gears, cylinders and pistons can reduce friction loses from passenger cars.

• True

• False

Around 38% of the fuel energy in an automotive internal combustion engine is transformed into thermal losses directly related to the exchange of heat from the combustion process.

• True

• False

When you are walking, static friction pushes in the direction of you are trying to move.

• True

• False

Camshaft bearing is a main friction zones in an Internal Combustion Engine (ICE)

• True

• False