8Class Friction Test 1

The frictional force exerted by fluid is called.

• Rollin friction
• slinding friction
• drag
• normal force

A man standing on the level floor. What forces acting on him?

• normal force
• gravitational force
• normal force and gravitational force
• Friction force

The unit of force is

• metre
• km
• Newton

• joule

Friction is propartional to.

• normal force
• force
• mass
• none of these

__________ Reduces the friction.

• Lubricant
• drag
• mass
• none of these

The chage in the length of a spring……………..to the applied force

• is indirect proportional

• is equal

• is direct proportional

• does not depend

When the speed of the body moving in a straight line changes continuously then the body acquires?

• acceleration
• speed
• velocity

• displacement

The body of birds and fish must have evolved to shapes in over coming……………

• rolling frictin
• static friction
• sliding friction
• fluid friction

This friction self adjusting force?(Sliding friction, static friction, rolling friction, fluid friction)

• Sliding friction
• static friction
• rolling friction
• fluid friction

Friction is indipendent of

• Nature of surface
• Normal force
• irregularities in surface
• Area of contact