
Exercise: 9.2
Q1. What are machines?
Ans: Machines are devices which are used to reduce the human effort and make the work easier.
Q2. Name three objects that you exert force on, while doing school work.
Ans: Pencil, Eraser, Sharpener.
Q3. Name these.
Ans:
1. Straight slanted surface: Inclined plane. 2. A rod that pivots at a fixed point pulley.
3. An inclined plane wrapped in spiral screw. 4. Double inclined plane Wedge.
5. Machine consisting of a grooved wheel that holds a rope wheel and axle.
Q4. Complete the following concept map.
Exercise : 9.4 Explain how atmospheric helps you drink throw a straw?
Ans:...