7Does the mechanical advantage of 2 for a single movable pulley mean that you’ll increase the amount of work you get out of the pulley?
8No, it doesn’t.If you get twice as muchforce out then you have topull out twice as much rope,but the amount of work (f x d)would not be effected.So how could you change the amount of work produced by the machine?
9A block and tackle is a combination of fixed and movable pulleys. The M.A. is equal to the number of rope segments supporting the weight.
10What is the mechanical advantage of this block & tackle?
28Which screw would have the greater M.A.? Which would be hardest to drive into a block of wood?Which would require more turns?A B
29The front sprocket on a bike has 2 gears which act as axles, while the circle created by the pedal acts as the wheel. The outer gear has a radius of 6 inches and the smaller inner one has a radius of 4 inches. If the pedal goes in a circle with a radius of 12 inches, calculate the mechanical advantage provided by each of the different gears.
30In the previous example, which gear would you want to be in if you were pedaling up a steep hill? Why?
31The lugnut on a large dump truck has a radius of 5 cm, and requires a force of 1,800 N to loosen. Lenny, however, can only produce 150 N of force. He knows that if he gets a long enough wrench then he can produce that much force. How long would the wrench need to be?
32Carl is applying 200 N of force to push a wheelbarrow up a ramp Carl is applying 200 N of force to push a wheelbarrow up a ramp. If the ramp is 6 m long and allows him to roll the wheelbarrow to a height of 1.5 m, what is the mechanical advantage of the ramp?How much force would Carl need to apply if he were not using the ramp?
33How much force would Waylon need to apply in order to lift a 375 N weight, using the pulley shown? How much rope would he need to pull out in order to raise the weight 4 m?
34Using the 3 pulleys shown below, how much force would Ned need to apply to each to lift a 400 N weight?Why wouldn’t he just always use the one which requires the least force?
35In the diagram below, the inclined plane is 5 m long and 2 m high In the diagram below, the inclined plane is 5 m long and 2 m high. The wheel and axle have radii of 25 inches and 10 inches respectively. How much force would be required to move the weight up the inclined plane? (assume no friction)How much work is being done by the machine?
36Paul used the setup on the right (called a Bosun’s Chair) to lift himself up to a higher position at his construction site.What is wrong with the way Paul has the chair set up?What would need to be done in order for the setup to work properly?
37Compare and contrast the operation of the 2 pulleys shown above (1 similarity and 1 difference). If they performed the same operation, would they be doing the same amount of work?
38Large water wheels were often used in the past to accomplish such tasks as grinding grain and cutting lumber in lumber mills. Pick one of these tasks, and draw a simple diagram showing how the motion of the water used simple machines to accomplish the task.
40Steamboats required huge wheels to produce the mechanical advantage necessary to turn the rudder. If the wheel in the picture has a diameter of 3 m, and is attached to an axle with a diameter of .5 m, what mechanical advantage would be produced?If the pilot applies 500 N of force to produce one complete revolution of the wheel (10 m), how much force was produced and how much work was done?
41What is the total mechanical advantage for the block and tackle setup at the right? If 1,000 N was being lifted 20 m, how much force would you need to apply, how much rope would you need to pull out, and how much work would you be doing?
42In the picture, gears A and B are the small gears, C is the large one. If C is turned clockwise, what direction(s) will the other gears turn?If A is turned counter-clockwise, what direction would B and C turn?If C is twice as large as A and B, what M.A. is gained?If 100 J of work is used toturn C, how much work willA and B do?
43In the diagram below, the inclined plane is 6 m long and 2 m high In the diagram below, the inclined plane is 6 m long and 2 m high. The wheel and axle have radii of 20 inches and 10 inches respectively. How much force would be required to move the weight up the inclined plane? (assume no friction)How much work is being done by the machine?
44Bob has an old house with very inefficient windows, so he had them all replaced with new insulated windows. When the workers had finished the installation, he noticed a pile of metal weights which were left behind from the old windows. What were they, what purpose did they serve, and how did they work?
50In the huge trebuchet shown below, what purpose do you think the wheel at the bottom serves? Think!
51Using the car jack shown, Dwight was able to raise a 3,000 pound car by only applying 15 pounds of turning force to the handle.What mechanical advantage did he gain?If the car was raised 1 foot, how many feet did he have to turn the handle?What effect did the jack have on the amount of work done?
52Andy is trying to lift a 1,000 pound weight Andy is trying to lift a 1,000 pound weight. Tell how much force he would need to apply using each of the pulley systems shown.A. B.C D.