Please select a subject first
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The following belong to which class of lever?
Sugar tongs
Concept: undefined >> undefined
The following belong to which class of lever?
A pair of scissors
Concept: undefined >> undefined
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The following belong to which class of lever?
Wheelbarrow
Concept: undefined >> undefined
The following belong to which class of lever?
Nutcracker
Concept: undefined >> undefined
The following belong to which class of lever?
Knife
Concept: undefined >> undefined
The following belong to which class of lever?
Fore-arm
Concept: undefined >> undefined
Shears, used for cutting metals and scissors used for cutting clothes are both examples of levers of the first order. However, whereas the shears always have short blades and long handles, the scissors often have blades much longer than the handles. Explain, why this is so?
Concept: undefined >> undefined
The following are an example of levers. State the class of lever to which each one belongs giving the relative positions of Load (L), Effort (E), Fulcrum (F):
(i) Scissors (ii) Sugar tongs (iii) Nutcracker (iv) Pliers.
Concept: undefined >> undefined
Draw a labelled sketch of a second class lever. Give one example of such a lever.
Concept: undefined >> undefined
In the diagram shown alongside a claw hammer, mark the fulcrum (F) and indicate the directions of load (L) and effort (E) with arrows. What class of lever is it? Give one more example of this class of lever.
Concept: undefined >> undefined
In the following diagram of a wheelbarrow, mark the fulcrum (F) and indicate the directions of load (L) and effort (E) with arrows.
What class of lever is it? Give one more example of the same class of lever.
Concept: undefined >> undefined
When we want to use a machine as a force multiplier, which class of lever should we preferably use? Give a simple diagram of such a lever.
Concept: undefined >> undefined
The diagram below shows a lever in use.
(i) To which class of lever does it belong?
(ii) If FA = 40 cm, AB = 60 cm, then find the mechanical advantage of the lever.
Concept: undefined >> undefined
The diagram shows the use of a lever.
- State the principle of moments as applied to the above lever.
- Which class of lever is this? Give an example of this class of lever.
- If FA = 100 cm, AB = 90 cm, calculate the minimum effort required to lift the load.
Concept: undefined >> undefined
State the types (or kinds) of lever, and give two examples of each kind.
Concept: undefined >> undefined
The length of a nut-cracker is 12 cm. A nut, when kept at a distance of 4 cm from its fulcrum, requires an effort of 100 gf to crack it. What force will be required to crack the nut without using the nut-cracker?
Concept: undefined >> undefined
A crowbar of length 100 cm is used to lift a load of 5 kgf. It has its fulcrum at a distance of 20 cm from the load. Calculate:
(i) the mechanical advantage of a crowbar and,
(ii) the effort applied at the other end.
Concept: undefined >> undefined
State and define Ohm’s law.
Concept: undefined >> undefined
Define ampere and volt with respect to Ohm’s law.
Concept: undefined >> undefined
