second term - rev

8/7/2019 SECOND TERM - REV

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H C HH O N

VI. Define the following: A) Screw B) Friction C) Simple machines

VII. Give reasons for the following:a. A waterfall has two forms of energy.

b. People slip when they step on a banana peel.

c. A parachute always comes down slowly.

d. Tyres of vehicles have grooves.VIII. Differentiate between the following:-

a) Wheel and Axle & Pulley. b) Wedge & Inclined plane.C) Formulae & Symbols

d) Energy & Work e) Gravitational & Magnetic Forces. f)Elements & CompoundsVIII. Answer the following questions:

1. Friction is a necessary evil. Justify the statement. [What arethe advantages &

disadvantages of friction.]2. What difference do you notice when you increase the length of load arm in a first class

lever?

3. What are the advantages of pulley?4. Define lever. Draw the diagrammatic representation of threeclasses of lever. Give 3

examples for each.5. What are the advantages of simple machines?IX. Name the simple machine principle used in thefollowing machines:

1. Escalator 2. Dust-bin with pedal 3. Spinning-top 4.Door-knob5. Water-tap 6. Claw-hammer 7. Screw-jack 8.Ferris-wheel10. Blade 11. Screw-driver 12. Car-wheel 13. Knife14. Egg-beater15. Chain passing through wheels used in lift 16. TrolleyX. Identify the order of lever:1. Pliers 2. Human arm holding a globe 3. Fishing-rod4. Lemon-squeezer5. Hand-pump 6. Cleaning with a mop 7. Ice-tong 8.Stapler 9. Broom



10. Door 11. Scissors 12. Nail-cutterXI. Identify the class of levers and mark the Effort,Load & Fulcrum in the simple

machines given below.

PLEASE TAKE A PRINT OUT AND BRING TO CLASS FORDISCUSSION ON 22/11/09

second term - rev

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