Question

cbse class 8 science chapter 12 friction keywords with meanings.
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Answer 1

Answer:

1) Ball breading

》A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. ... As one of the bearing races rotates it causes the balls to rotate as well.

2)Drag

》A tedious experience, a bore, as in After several thousand times, signing your autograph can be a drag. This seemingly modern term was army slang during the Civil War. The allusion probably is to drag as something that impedes progress. [ Colloquial; mid-1800s]

3)Fluid friction

》There is a friction whenever an object moves through a fluid.It is called fluid friction. Air is very light and thin, yet it exerts frictional force on objects moving through it. When an object moves through the air ,it pushes the air out of the way and air pushes back on the object

4) Interlocking

》every objects have some irregularities or roughness on its surface, when two different surfaces come in contact ,the irregularities got into each other and they get interlock. therefore, this is called interlocking

5)Lubricants

》A substance (such as grease) capable of reducing friction, heat, and wear when introduced as a film between solid surfaces. 2 : something that lessens or prevents friction or difficulty a social lubricant.

6)Rolling Friction

》Rolling friction occurs when a wheel, ball, or cylinder rolls freely over a surface, as in ball and roller bearings. The main source of friction in rolling appears to be dissipation of energy involved in deformation of the objects.

7)Sliding friction

》the friction between two bodies that are in sliding contact. — called also kinetic friction

8)stating friction

》 In static friction, the frictional force resists force that is applied to an object, and the object remains at rest until the force of static friction is overcome. In kinetic friction, the frictional force resists the motion of an object

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