Match the following. Column I Column II a) Contact force i. Newton b) Non-contact force ii. Muscular force c) Force iii. N / m 2 d) Pressure iv. Gravitational force e) Pressure exerted by liquid v. Barometer f) Atmospheric pressure vi. Increases with depth

For (a)- correct match is (ii). Muscular force requires the contact between the body and the object. Thus, it is a contact force. It can not be applied when the object experiencing force and the agent applying force are at a certain distance. For (b)- correct match is (iv). The gravitational force operates from a distance and does not require any visible interaction, thus it is a non-contact force. It occurs between all the objects with mass. For (c)- correct match is (i). Force is measured in the S.I. unit known as newton N . The 1 N of force is the force required to accelerate an object with a mass of 1 kg at a rate of 1 m / s 2 . For (d)- correct match is (iii). Pressure is the force exerted per unit area on an object. So, the S.I. unit of pressure is the pascal Pa . It is also termed as N / m 2 . For (e)- correct match is (vi). The pressure exerted by a liquid increases as the depth increases. The pressure is directly proportional to the force, and we know that the force is proportional to the mass of the object. Therefore, with the increase in depth, the mass of liquid increases exerting more force per unit area. For (f)- correct match is (v). Atmospheric pressure is the pressure exerted by the weight of atmosphere on the earth's surface. It is measured by an instrument known as a barometer. So, the correct table is shown below:- Column I Column II a) Contact force ii. Muscular force b) Non-contact force iv. Gravitational force c) Force i. Newton d) Pressure iii. N / m 2 e) Pressure exerted by liquid vi. Increases with depth f) Atmospheric pressure v. Barometer

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Galaxy A Course in Science Book 8>Chapter 11 - Force and Pressure>Quick Check?>Q 2

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Frictional force arises when two objects come in contact with each other.

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Important Questions on Force and Pressure

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Galaxy A Course in Science Book 8>Chapter 11 - Force and Pressure>Quick Check?>Q 3

Magnets move away from each other when unlike poles face each other.

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Galaxy A Course in Science Book 8>Chapter 11 - Force and Pressure>Quick Check?>Q 4

If two forces act in same direction, the net force is the sum of the forces acted.

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Galaxy A Course in Science Book 8>Chapter 11 - Force and Pressure>Quick Check?>Q 5

The SI unit of force is newton.

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Galaxy A Course in Science Book 8>Chapter 11 - Force and Pressure>Quick Check?>Q 1

Match the following.

	Column I		Column II
a)	Contact force	i.	Newton
b)	Non-contact force	ii.	Muscular force
c)	Force	iii.	$N / m^{2}$
d)	Pressure	iv.	Gravitational force
e)	Pressure exerted by liquid	v.	Barometer
f)	Atmospheric pressure	vi.	Increases with depth