6. Which is not a contact force?
A. friction
B. gravity
C. normal
D. tension

7. The energy produced by vibrating objects.
A. chemical energy
B. electrical energy
C. mechanical energy
D. sound energy

8. The energy that comes from the flow of electrons from one material to another is:
D. sound energy
A. chemical energy
B. electrical energy
C. mechanical energy

9. What energy is stored in a dry cell?
A. chemical energy
B. light energy
C. mechanical energy
D. nuclear energy

10. Which energy allows radio, TV.computers, washing machine etc. to function?
A chemical energy
B. electrical energy
C. mechanical energy
D. sound energy​