PHYSICS fill in the blanks.

................ causes wear and tear of moving parts of the machine.

Lubricants are used to .....................friction.

Friction .......................the motion.

We use ball bearings to .................. the friction.

On applying brakes on a moving car, its speed .........................

A moving football when kicked, its .................. changes.

On pulling a string, its ..................increases.

On squeezing a gum tube, its ............. changes.

Force is applied as ........... or ..........

The force acting on a mango falling from a tree is an example of .....................

Magnetic force is a ................force.

.................... is the SI unit of force.

Bicycles use ...................... to reduce friction between the pedals and the crank

Friction is a type of .................

Friction depends upon the ...............of an object.

Smoother the surface, ................. is the frictional force offered by it.

Rolling friction is ...........than sliding friction.

Sliding friction and rolling friction are types of..................friction.

Weight remaining the same, friction is independent of .............of surface in contact.

The force of friction acting between two bodies in contact while at rest is known as ................ friction.

Rolling friction offers .............resistance than sliding friction.

More the roughness of a surface, greater is the ........................