Which of the following is true? a. Heavy floods lead to an increase in mountain pine beetles.
b. Lengthy droughts lead to an increase in mountain pine beetles.
c. Lengthy droughts lead to a decrease in mountain pine beetles.
d. Weather has no impact on mountain pine beetle populations.

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It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on