1. Is there any multiplication of force in a single fixed pulley? why is it considered a machine?
2. State the principle of lever in terms of mechanical advantage. How will you to write the principle of a lever in terms of effort arm & load arm?
3. The load arm in a crow bar is 3/5 of the effort arm. Find the load that can be lifted by using this crow bar by applying an effort of 3 Newton.
4. A Boy can apply a maximum effort of 5 Newton. Find the load that he can lift using a crowbar of length 4 m whose fulcrum is at a distance of 2 m from the point of application of the effort.
5. The rod of a lemon cutter is 40 cm long. The lemon,requires force of 9 Newton for its cutting, is kept at a distance of 10 cm from its fulcrum end. Find the effort needed?
6. The the fulcrum of a crowbar is at a distance of 50 cm from the load. If the the total length of the crowbar is 300 cm, how much load can it lift by applying and effort of 400 Newton?
7. A rod whose length is is 1.40 m has its fulcrum situated at a distance of 0.2 m from the load . Calculate the mechanical advantage of the rod.
8. A wheelbarrow has an effort arm 160 cm long and a load arm 40 cm long. What is its mechanical advantage?
9. Is it possible to increase the mechanical advantage of a lever. Justify your Answer with the help of a suitable example.
10. Why roads on Hills are made to have very gentle slopes?
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