Question

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Answer 1

Answer:

3.

$\frac{1}{2} \times bh = 36cm {}^{2}$

$\frac{1 }{2 } \times b \times 3 = 36$

$3b = 36 \times 2$

$b = \frac{36 \times 2}{3}$

$b = 12 \times 2$

$b = 12cm$

4.

$bh = 28cm ^{2}$

$8h = 28$

$h = \frac{28}{8}$

$h = 3.5cm$

Answer 2

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$Friction is the force that resists motion when the surface of one object comes in contact with the surface of another. The mechanical advantage of a machine is reduced by friction, or in other words, the ratio of output to input is reduced because of friction. An automobile uses one-quarter of its energy on limiting the friction. Yet, it is also friction in the tires that allows the car to stay on the road and friction in the clutch that makes it possible to drive. From matches to machines to molecular structures, friction is one of the most significant phenomena in the physical world. In this article, let us discuss frictional force and its different types$

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