Question

Match the following: WORKSHEET - 9 A' B' 1. Sparks are produced when a pair of scissors is sharpened against a grinding a. To make them rough and increase wheel. friction. 2. A piece of chalk wears out as it is used b. Friction produces heat. on a blackboard. 3. Trolleys have wheels. c. Friction causes wear and tear. 4. The leather soles of new shoes are d. Rolling reduces friction. rubbed on a rough surface. WORKSHEET - 10 1. How many forces act on the brick in the horizontal direction? i need answer
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Answer 1

Answer:

The outermost layer of the earth's surface : (a) Ionosphere

(b) Thermosphere

(c) Troposhere

(1⁄ ×10=5) 2

(d) Stratosphere

Answer 2

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