Question

6. Fill in the blanks

a. An example of a non-contact force is __________.

b. The pressure exerted by air around us is known as __________.

c. SI unit of force is __________.

d. Application of force can change the ______ or __________ of an object.

e. Force exerted by our muscles is called __________ force.

f. Direction of force of friction is always __________ to the direction of motion.

g. Force per unit area is called ___________.

h. The force exerted by a charged body on another charged or uncharged body is know as ________.
i. force has ________ as well as _________.​

Answer 1

Answer:

1- Magnetism is an example of a non-contact or action-at-a-distance force. These are forces which can act on an object without being in physical contact with it. The force of gravity is another example. Thus, gravity will pull a raindrop down to Earth without any tangible physical link between the Earth and the drop.2- atmospheric pressure

The pressure exerted by air around us is known as atmospheric pressure.

3-The SI unit of force is the newton, symbol N. The base units relevant to force are: The metre, unit of length — symbol m. The kilogram, unit of mass — symbol kg. The second, unit of time — symbol s.

Answer 2

a) An example of non contact force is Electrostatic force

b) The pressure exerted by air around us is known as Atmospheric pressure

c) SI unit of force is Newton (N)

d) Application of force can change the speed or shape of the object.

e) Force exerted by our muscles is called Muscular force

f) Direction of force of friction is always opposite to the direction of motion

g) Force per unit area is called Pressure

h) The force exerted by a charged body on another charged or uncharged body is known as Electrostatic force

i) Force has direction as well as magnitude

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⭐ADDITIONAL INFORMATION ⭐

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What is force?

Force is the push or pull applied on an object. SI unit of force is Newton (N).

Force is of two types,

• Contact force: Friction and muscular force
• Non contact force: Gravity, Electrostatic force and magnetic force

Force applied on an object can produce the following effects:

• It can change the shape and size of the object
• It can change the speed of the moving object
• It can change the direction of the moving object
• It can move a stationary object
• It can stop a moving object

For force to come into play, interaction between the objects is necessary.

SI unit of pressure is Pascal or Pa.

Pressure = $\frac {<strong>Force</strong>}{<strong>Area</strong>}$

Pa = $\frac {<strong>N</strong>}{<strong>m</strong><strong>²</strong>}$