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6. What is the best tool to remove a nail from a piece of wood? A/an-
A. inclined plane such as the ramp
B. lever such as claw ended hammer
C. pulley system
D. wheel and axle such as a wagon
7. Which of the following do simple machines cannot perform? Reduce the ____
A. distance the object needs to be moved
B. mass of an object that needs to be moved
C. force needed to move an object over a distance
D. amount of time needed to moved an object over a distance
8. Which of the following best explains why lifting a heavy equipment with a single fixed pulley and rope makes the task seem easier?
A. Less force is needed to lift the object.
B. Less work is done when moving the object.
C. The direction of the force required to lift the object is changed.
D. The force needed to move the object is applied over a greater
distance.
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