I ) Give one word for the following :- 1. The net force which causes some effect on an object-

2. A device in which ball bearings are used to reduce friction-

II ) Select the correct option :-

1. Buring of a meteor in the atmosphere is due to .
a) Frictional force
b) Magnetic force
c) gravitational force

2. The deep groves in the tyres of a tracter-
a) increase friction
b) decrease friction
c) make it stable

3. The force which an object exerts on any other object is .
a) gravitational force
b) magnetic force
c) electrostatic force
d) frictional force

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pe = weightxheight = 2000x1000=2,000,000joules

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.  

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form