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6. It is a form of energy that flows hot objects to cool objects.
A. heat
B. sound
C. wind
D. electricity
7. It is a form of energy that travels in a straight line.
A. light
B. wind
C. sound
D. head
8. A
is a triangular shaped tool, and is a portable inclined plane, and one of
the six simple machines.
A. wedge
B. pulley
C.screw
D. lever
9. It is a simple machine that has a long and thin metal shaft with threads spiralling al
its length.
A. screw
B. lever
C. pulley
D. wedge
10. What simple machine is made by looping a rope over one or more wheels?
A. inclined plane B. wedge
C. lever
D. pulley​