Friction class 8 True False Test

Friction True False Test

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Kerala PSC

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Force of friction opposes the motion of object. - True

The direction of force of friction and the direction of moving object is same. - False

Force of friction works at the contact surface. - True

The amount of friction does not depends on the materials from which the two surfaces are made. - False

Air resistance is a kind of friction. - True

Friction is a nessary evil. - True

Mass of object does not affect friction. - False

Smooth surface increses friction. - False

Friction is caused by the irregularities on the two surfaces in contact. - True

Surfaces which appear very rough have a large number of minute irregularities on them. - False

Irregularities on the two surfaces in contact lock into one another. - True

On rough surfaces, there are a larger number of irregularities. - True

The force of friction is less if a rough surface is there. - False

The force of friction will increase if the two surfaces are pressed harder. - True

The force required to overcome friction at the instant an object starts moving from rest is a measure of static friction. - True

the force required to keep the object moving with the same speed is a measure of static friction. - False

The sliding friction is slightly smaller than the static friction. - True

Friction helps us to walk and write with pen or pencil. - True

If there were no friction, when an object started moving it would stop. - False

Friction wears out the materials whether they are screws, ball bearings or soles of shoes. - True

Friction can not produce heat. - False

The soles of our shoes are grooved to give a better grip on the ground. - True

Powder sprinkled over the surface of carrom board decreases the friction. - True

The substances which reduce friction are called lubricants. - True

Wheels reduce friction of an object - True

The heat to the motion of an object is called the rolling friction - False

It is convenient to pull the luggages fitted with rollers. - True

The rolling friction is smaller than the sliding friction. - True

The frictional force exerted by fluids is also called drag. - True

Streamlined shape is given to an object moving in fluid to minimize drag. - True