Grade 8 CBSE Friction

Fluid friction is the force that opposes a motion that takes place within fluids is or in between foods. The frictional force exerted by fluid is also called

• Drag

• Pressure

• SubcombineForce

• None

In a cycling race, it is It is observed that a cycle is normally bends his body. WHY?

• Feel comfortable

• Reduce his weight

• Reduce the air drag

• Increase energy consumption

The two common forces attracting on us

everywhere are

• Gravity and Friction

• Gravity and Magnetic Force

• Electrostatic and Gravitational Force

• None of the above

When the surface is in, contact Tend to move or move with respect to each other. The Force of friction comes into play.

• Only if the objects are solid

• Only if one of the 2 objects is liquid

• I don't know

• Irespective of the state of matter of the object

To sharpen the blade of a knife by rubbing it against the the service, which of the following will be the most suitable?

• Stone

• Plactic block

• Wooden Block

• Wood

A spring balance measures force

• True

• False

Friction can never be eliminated.

• True

• False

A soapy floor is slippery due to increase the fiction.

• True

• False

Friction is dependent on area of contact

• True

• False

Friction decreases to the increase in the smooth of a surface

• True

• False