If you can not change your effort force or your resistance force, to make it easier to lift a resistance you could __lengthen __ the length of the moment arm for the effort and/or __shorten __ the length of the moment arm for the resistance.

Question

BlackTom AI · Accepted Answer

The problem describes a scenario where you cannot change your effort force or the resistance force, and asks how to make lifting easier by adjusting moment arms.
First, recall the lever principle: required effort torque equals resistance torque, which is F_resist × r_resist. If the effort force F_eff is fixed, making the lever longer for the effort arm increases the moment about the pivot contributed by the same effort, helping balance the load more easily. In other words, lengthening the effort arm (increase r_effort) reduces the effort required to generate the necessary torque, so this choice makes lifting easier.
Second, consider shortening the resistance arm. Since resistance torque is F_resist × r_resist, decreasing r_resist lowers the opposing torque you must overcome for the same resistance force. With a shorter resistance arm, the same resistance force produces less torque, which again eases the job for a given effort force. Therefore, shortening the resistance arm also makes lifting easier.
Taken together, both options are valid strategies under the constraint of not changing the effort or resistance force: lengthening the effort arm and/or shortening the resistance arm reduce the required effort torque, making the lift easier.

2025FA-HES-207-001 B. ONQ#5

If you can not change your effort force or your resistance force, to make it easier to lift a resistance you could lengthen the length of the moment arm for the effort and/or shorten the length of the moment arm for the resistance.

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类似问题

If a first-class lever has a resistance of 400 lbs at a distance of 10 inches from the fulcrum, and the effort arm is 50 inches, how much effort force is required to lift the resistance?

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Refer to the lever in the diagram above and answer the following: This is a 2nd class lever. The lever has a mechanical “advantage” MA>1 . The function of the lever is to allow less effort to be required to overcome the resistance .

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Refer to the lever in the diagram above and answer the following: This is a 3rd class lever. The lever has a mechanical “disadvantage” MA <1 The function of the lever is to increase the speed and range of motion of the resistance. .

Which of the following statements describes a second-class lever?

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2025FA-HES-207-001 B. ONQ#5

If you can not change your effort force or your resistance force, to make it easier to lift a resistance you could __lengthen __ the length of the moment arm for the effort and/or __shorten __ the length of the moment arm for the resistance.

查看解析

登录即可查看完整答案

类似问题

If a first-class lever has a resistance of 400 lbs at a distance of 10 inches from the fulcrum, and the effort arm is 50 inches, how much effort force is required to lift the resistance?

The lever below is a 2nd class lever, this type of lever has a mechanical advantage of > 1 .

What is the mechanical advantage of the simple machine in the figure if li = 4 lo ?

Refer to the lever in the diagram above and answer the following: This is a __2nd class __ lever. The lever has a __mechanical “advantage” MA>1 __. The function of the lever is to __allow less effort to be required to overcome the resistance __.

Refer to the lever in the diagram above and answer the following: This is a __1st class __ lever. The lever has a __mechanical “advantage” MA> __ The function of the lever is to __allow less effort to be required to overcome the resistance __.

Refer to the lever in the diagram above and answer the following: This is a __3rd class __ lever. The lever has a __mechanical “disadvantage” MA <1 __ The function of the lever is to __increase the speed and range of motion of the resistance. __.

Which of the following statements describes a second-class lever?

Which of the following statements describes a second-class lever?

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希望你的学习变得更简单

If you can not change your effort force or your resistance force, to make it easier to lift a resistance you could lengthen the length of the moment arm for the effort and/or shorten the length of the moment arm for the resistance.

Refer to the lever in the diagram above and answer the following: This is a 2nd class lever. The lever has a mechanical “advantage” MA>1 . The function of the lever is to allow less effort to be required to overcome the resistance .

Refer to the lever in the diagram above and answer the following: This is a 1st class lever. The lever has a mechanical “advantage” MA> The function of the lever is to allow less effort to be required to overcome the resistance .

Refer to the lever in the diagram above and answer the following: This is a 3rd class lever. The lever has a mechanical “disadvantage” MA <1 The function of the lever is to increase the speed and range of motion of the resistance. .