Solution:
Class II Levers
always have more mechanical advantages than 1.
Which type of lever has a mechanical advantage always more than 1 give reason with one example what change can be made in this lever to increase its mechanical advantage?
Class II lever
always has a mechanical advantage more than one. Example: a nutcracker. To increase its mechanical advantage we can increase the length of effort arm.
Which type of lever has a mechanical advantage always more than 1 and why?
The Class II levers
have mechanical advantage always greater than 1 and the reason for this is that, the load and effort are on same side of the fulcrum but in opposite directions and the effort arm is always greater than the load arm. Therefore, mechanical advantage is always greater than 1.
Which type of lever has mechanical advantage less than 1 give reason?
The mechanical advantage of a lever of the
third order
is always less than one because the effort arm is always less than the load arm.
What is a mechanical advantage greater than 1?
A machine with a mechanical advantage of greater than 1
multiplies the input force
. Examples: can opener.
What is a class 2 lever examples?
A wheelbarrow, a bottle opener, and an oar
are examples of second class levers.
Why is the mechanical advantage of a lever of third order is always less than 1?
Mechanical advantage of a class 3 lever is always less than 1
because the load arm is always longer than effort arm
. This helps by reducing the applied force(effort). So, it is a speed multiplier.
What is a class 2 lever?
In second class levers
the load is between the effort (force) and the fulcrum
. A common example is a wheelbarrow where the effort moves a large distance to lift a heavy load, with the axle and wheel as the fulcrum. In a second class lever the effort moves over a large distance to raise the load a small distance.
Which class of lever has the highest mechanical advantage?
Second class levers
have the best mechanical advantage, so they can move a large load with a relatively small effort.
Is single movable pulley force multiplier?
Thus, using a single movable pulley, the load can be lifted by applying an
effort equal to half the load
(in ideal situation), i.e. the single movable pulley acts as a force multiplier.
Why is a class 3 lever useful?
A class 3 lever has the effort between the fulcrum and the load. Because the load and effort are on the same side, they move in the same direction. In a class 3 lever, the effort is always closer to the fulcrum than the load, so class 3 levers are
used to make the load move faster
.
Why working is always easier with second class lever?
Using a
lever makes it easier to move a load
and so you use less effort. … 2) Second Class Lever — the load is between the fulcrum and the effort. An example is a nutcracker or a wheelbarrow. This type of lever always acts as a force magnifier and its mechanical advantage is greater than one.
What are 1st 2nd and 3rd class levers?
–
First class levers have the fulcrum in the middle
. – Second class levers have the load in the middle. – This means a large load can be moved with relatively low effort. – Third class levers have the effort in the middle.
What happens if the mechanical advantage is less than 1?
Sometimes the mechanical advantage of a machine is less than one. That is,
a person has to put in more force than the machine can move
. Class three levers are examples of such machines.
Is mechanical advantage is always greater than 1?
It is
always greater than the actual mechanical advantage
because all machines must overcome friction. The mechanical advantage of a machine may be greater than, less than, or equal to 1, depending on the type of machine.
What is the only example of a 2nd class lever in the human body?
The most obvious example is a wheelbarrow, where a weight is placed in the bed of the wheelbarrow between the wheel (axis) and the hands of the person using the wheelbarrow (force). In the human body, an example of a second-class lever is found
in the lower leg when someone stands on tiptoes
(figure 1.22b).
