CHAPTER:- Simple Machines Class - 5

1. What is machine? Give example.

Ans: A machine which makes our work easy. Ex- Nut Crackers.

2. How many types of machines?

Ans: Two types of machine - (i) Simple machine ( Scissors)

                                               (ii) Complex machine ( Car)

3. What is simple machine? Give example.

Ans: Simple machines are basic tools for applying a force and doing work. Ex- Scissors.

4. What is complex machine? Give example.

Ans: Complex machines are made from combining different types of simple machines. Ex - Car.

5. How many types of simple machines? Name them.

Ans: There are six types of simple machines.

         (i) Lever - See-saw.

         (ii) Inclined plane - Stair.

         (iii) Screw - Nut-bolts.

         (iv) Wedge - Axe.

         (v) Pulley - Crane.

         (vi) Wheel and Axle -  Door knobs.

6. Define lever.

Ans: A lever is a simple machine that is used to lift heavy objects by small force.

7. How many types of lever? Give example.

Ans: There are three types of levers.

         (i) Class 1 Lever (Scissors)

         (ii) Class 2 Lever ( Wheel Barrow)

         (iii) Class 3 Lever ( Tongs)

8. On which basis levers are divided?

Ans: The levers are divided on the position of fulcrum, load, and effort.

9. What is fulcrum?

Ans: Fulcrum is a fixed point on which the rod ( lever) moves freely.

10. What is inclined plane?

Ans: Inclined plane is a simple machine it has slopping surface. Ex - Ramp.

11. What is screw?

Ans: An inclined plane wrapped surround a nail called screw. Ex - Nut-bolt.

12. What is wedge?

Ans: Two inclined plane join together ( back to back) is called wedge. Ex - Axe, Knife.

13. What is pulley?

Ans: A pulley which has wheel with grooves, on which a chain moves to lift load. Ex - Crane.

14. What is Wheel and Axle?

Ans: A wheel and Axle is arrangement of wheel that attached to a axle (rod). Ex - Door-knob.

15. Write the difference between Class - 1 lever and class - 2 lever.

Ans:

Class -1 lever	Class -2 lever
(i) Fulcrum is in middle	(i) Load is in middle
(ii) Mechanical advantage is  <1, >1, =1	(ii) Always >1

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