Click the correct answer (True or False).
Click the correct answer.
What is the frictional force exerted by fluids called?
Drag
Sliding friction
Rolling friction
None of these
Friction between two flat surfaces cannot be reduced by which of the following?
Greasing
Polishing
Using ball bearing
Decreasing the area
Rolling friction is always less than which of the following?
Fluid friction
Sliding friction
Static friction
Sliding friction and static friction
Which of the following is not an effect of friction?
Moving objects slow down
Moving objects stop
Moving objects wear off
Moving objects have weight
Which of the following does not result in increasing fiction?
Roughen the surface
Dry the surface
Use brake pads
Using lubricant
Click the correct answer.
Friction is caused by the
on the surfaces in contact.
irregularities
regularities
Sliding friction is more than
.
rolling friction
static friction
