Friction

Friction opposes the_________ between the surfaces in contact with each other.

• nature

• relative motion

• motion

• both 2 & 3

Friction depends on the_________of the surface.

• nature

• motion

• heat

• none of these

Choose the correct order

• Sliding friction is bigger than static friction

• Sliding friction is smaller than static friction

• Static friction is bigger than sliding friction

• Static friction is smaller than sliding friction

Friction can be increased by making a surface_______

• smooth

• hard

• rough

• soft

The sole of the shoes and the tyres of the vehicle are treaded to _________friction

• increase

• decrease

• reduce

• none of these

Choose the correct example to show that friction a foe

• Friction allows up to grip and catch different objects

• It helps us to walk comfortably on a surface

• It helps to minimize speed or to stop moving objects

• It does not allow the free movement of objects

The opposing force which is acting between the surface of contact when one object slides or trends to slide over the other

• Static friction

• Sliding friction

• Rolling friction

• Friction

Name the device which is used for measuring force acting on an object

• Free balance

• Force balance

• Spring balance

• None of these

Manu runs his toy toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be

• wet marble floor, dry marble floor, towel, newspaper.

• towel, newspaper, dry marble floor, wet marble floor.

• newspaper, towel, dry marble floor, wet marble floor.

• wet marble floor, dry marble floor, newspaper and towel.

Tags

NGSS.MS-PS2-2

The frictional force exerted by fluids is calld_________

• drag

• fluid friction

• fliud friction

• fluids