A force is a push or pull, which changes or tends to change the state of rest or the uniform motion of a body or changes the direction or shape of a body. Force is a vector quantity and its SI unit is newton.

The force which always opposes the motion of one body over the surface of another body is called friction. It is generated due to the interlocking between the irregularities of the surfaces in contact. The force of friction always acts in the direction opposite to the direction in which the object is moving.

The earth pulls all objects towards its centre by some force this force is called the force of gravity or gravity. Gravity is a non-contact force. It is a universal force of attraction acting between all the object that has a certain mass.

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Study Mate Science Class 8>Chapter 11 - Force and Pressure>NUT Cracker>Q IV

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Important Questions on Force and Pressure

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Study Mate Science Class 8>Chapter 11 - Force and Pressure>NUT Cracker>Q IV

The bulb of a dropper is pressed while its nozzle is dipped in water. The air is fully expelled from the dropper and is seen escaping in the form of bubbles. However, once the bulb is released, the water rises in the dropper due to: