QUIZ PRACTICE 2

1. They help us make our work easier and faster. 

2. It is the fixed point where a lever turns. 

3. They are two inclined planes joined back to back used to split things. 

4. It is the simple machine that we use to open the blind of the window.  

5. They move an object, stop it or change its shape or direction. 

6. Write two examples of non-contact forces. 

7. It is the force between an object and the surface. 

8. It changes one form of energy into another. 

9. They are in the nucleus of the atom and have positive charge. 

10. It is the flow of electrons.

11. It is used to open and close an electric circuit. 

12. The places where electricity is generated. 

13. It is the property of some materials which attract metals. 

14. It is a device that acts like a magnet when an electric current passes through it. 

15. It is a device with a magnetic needle that always points to the magnetic north pole. 

16. Lenses which concentrate light rays and focus them in one point. 

17. The force created when two magnetic south poles try to join. 

18. When a sound bounces off a surface that is near. 

19. This characteristic tells if a sound is high or low. 

20. It is an unwanted sound.