Match the column I with column II. Column I Column II (a) Contact force (i) Push or Pull (b) Pressure (ii) Non-contact force (c) Magnitude (iii) Muscular force (d) Force (iv) Strength of force (e) Force of gravity (v) Force on unit area

(a) Contact force - (iii) Muscular force These are forces that act between two objects that are physically touching each other. Example of this type are muscular force and frictional force. (b) Pressure - (v) Force on unit area Pressure is the force acting on a unit area of a surface. Mathematically, it is defined as Pressure = Force Area . S.I. unit of pressure is pascal. (c) Magnitude - (iv) Strength of force It means strength of the force. Magnitude of any physical quantity is its numerical value. The magnitude of force is measured in S.I. unit called newton. (d) Force - (i) Push or Pull It is a push or pull acting on an object. Force is due to interaction and is responsible to change the state motion of an object. (e) Force of gravity - (ii) Non-contact force It is the force with which the earth attracts the objects towards it, and is a non-contact force. Column I Column II (a) Contact force (iii) Muscular force (b) Pressure (v) Force on unit area (c) Magnitude (iv) Strength of force (d) Force (i) Push or Pull (e) Force of gravity (ii) Non-contact force

Match the column I with column II. Column I Column II (a) Electrostatic force (i) Attract each other (b) Atmospheric pressure (ii) Exert same pressure at equal depth (c) Unlike poles (iii) 760 mm of Hg (d) Liquids (iv) Force between charges

(a) Electrostatic force - (iv) Force between charges The electrostatic force is a type of non-contact force which defines that the forces are either attractive or repulsive between particles that are caused by their electric charges. (b) Atmospheric pressure - (iii) 760 mm of Hg It is the pressure exerted by the air around us. The atmospheric pressure on the surface of the earth at sea level is 760 mm of Hg . (c) Unlike poles - (i) attract each other Two unlike poles attract each other. The north pole of the magnet attracts the south pole of the magnet. (d) Liquids - (ii) Exert same pressure at equal depth Liquid exerts pressure in all directions in a container in which it is kept and this pressure increases with depth, but is same on all points at equal depth. Column I Column II (a) Electrostatic force (iv) Force between two charges (b) Atmospheric pressure (iii) 760 mm of Hg (c) Unlike poles (i) Attract each other (d) Liquids (ii) Exert same pressure at equal depth

E M B I B E

All in One - SCIENCE CBSE Class 8>Chapter 11 - Force and Pressure>Chapter Practice>Q 7

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If two forces act in opposite directions, then net force is the difference between the two forces.

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Important Questions on Force and Pressure

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All in One - SCIENCE CBSE Class 8>Chapter 11 - Force and Pressure>Chapter Practice>Q 8

The nails penetrated into the planks easily because a large force acts on a small area.

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All in One - SCIENCE CBSE Class 8>Chapter 11 - Force and Pressure>Chapter Practice>Q 9

Water comes out more slowly from an upstairs tap than from a similar tap downstairs.

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All in One - SCIENCE CBSE Class 8>Chapter 11 - Force and Pressure>Chapter Practice>Q 10

In 'tug of war' when both the teams apply equally pulling force then the net force is maximum.

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All in One - SCIENCE CBSE Class 8>Chapter 11 - Force and Pressure>Chapter Practice>Q 1

Match the column I with column II.

Column I	Column II
(a) Contact force	(i) Push or Pull
(b) Pressure	(ii) Non-contact force
(c) Magnitude	(iii) Muscular force
(d) Force	(iv) Strength of force
(e) Force of gravity	(v) Force on unit area

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All in One - SCIENCE CBSE Class 8>Chapter 11 - Force and Pressure>Chapter Practice>Q 2

Match the column I with column II.

Column I	Column II
(a) Electrostatic force	(i) Attract each other
(b) Atmospheric pressure	(ii) Exert same pressure at equal depth
(c) Unlike poles	(iii) $760 mm of Hg$
(d) Liquids	(iv) Force between charges