Question

PLEASE HELP ME 100 POINTS

See how a block and tackle system can increase your mechanical advantage. You will need two broomsticks, a rope, and two helpers.

A. Give each helper a broom stick and have them stand facing each other holding the broomstick firmly in both hands in a horizontal position. The broomsticks should be at the same level, about two feet apart.

B. Tie one end of the rope to one of the broomsticks. (You may need to have one of your helpers hold the knot firmly in one hand as he or she holds the broomstick to help anchor it.)

C. Wrap the rope around the other broomstick, as in a simple pulley system, and pull on the free end of the rope. Your helpers should resist your pulling. What happens? Can you pull the broomsticks together?

D. Now weave the rope back over the first broomstick, so you have a double pulley. Pull on the free end. What happens now? Can you pull the broomsticks together? What is your mechanical advantage?

E. Try weaving the rope over the broomsticks one or two more times. Describe what happens, and state the mechanical advantage of each situation.

F. Write a summary of what happened and an explanation using the terms:

force
distance

Answer 1

A block and tackle system is a simple machine that uses pulleys and ropes to increase mechanical advantage.

In the experiment described, the mechanical advantage was tested by pulling on the free end of a rope tied to two broomsticks held by two helpers.

In part C, with a single pulley system, the rope was wrapped around one of the broomsticks. When the free end of the rope was pulled, the broomsticks did not move closer together because the effort force needed to pull the broomsticks together was the same as the force applied to the rope.

In part D, with a double pulley system, the rope was woven back over the first broomstick, creating a system of two pulleys. The mechanical advantage increased with the double pulley system, as the effort force needed to pull the broomsticks together was reduced. This happened because the distance over which the force was applied was increased, which in turn reduced the amount of force needed to achieve the same result. The mechanical advantage in this case was 2.

In parts E and F, weaving the rope over the broomsticks one or two more times created a system of multiple pulleys, and each additional pulley added to the mechanical advantage. The mechanical advantage increased with each additional pulley, as the distance over which the force was applied increased and the effort force needed to pull the broomsticks together was reduced.

In summary, the block and tackle system increased mechanical advantage by reducing the effort force needed to pull the broomsticks together by increasing the distance over which the force was applied.

Step-by-step explanation: