Lever Mechanics | Principles & Historical Use (2024)

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`; this._targetInput.insertAdjacentHTML('afterend', dHtm); this._targetInput.nextElementSibling.insertAdjacentElement('beforeend', this._targetInput); } this._newVoiceId = `v_searchByVoice_${this._instanceIndex}`; this._voiceTextElmId = `v_voiceTxtEl_${this._instanceIndex}`; var newVoice = document.getElementById(this._newVoiceId); if ((this._targetInput || this._targetInputList) && !newVoice) { let sHtm = ` `; if (!this._textableInstance) { this._targetInput.insertAdjacentHTML('afterend', sHtm); this._targetInput.parentElement.classList.add('v_hasVoiceSearch'); } else { if (this._targetSelectionElm.parentElement === null) { var summernoteToolBar = document.getElementById('summernote-disconnected-toolbar'); if (summernoteToolBar) { var rowTwo = summernoteToolBar.getElementsByClassName('note-row2')[0]; this._targetSelectionElm = rowTwo; } } if (this._targetSelectionElm) { this._targetSelectionElm.insertAdjacentHTML('beforeend', sHtm); this._targetSelectionElm.classList.add('v_hasVoiceSearch'); } else { return true; } } } return false; }; SpeechToTextHelper.prototype.SetupRecognition = function () { let finalTranscript = ''; let voiceTutElm = document.getElementById(this._voiceTextElmId); let selectedInstanceIndex = this._instanceIndex; this._recState.recognition = new this._speechRecognition(); this._recState.recognition.continuous = false; //this._recState.recognition.lang = 'en-US'; this._recState.recognition.interimResults = true; if ((this._targetInput || this._targetInputList) && voiceTutElm) { this._recState.recognition.onresult = function (e) { let thisPointer = speechInstances[selectedInstanceIndex]; let interimTranscript = ""; for (let i = e.resultIndex; i < e.results.length; i += 1) { const { transcript } = e.results[i][0]; if (e.results[i].isFinal) { finalTranscript += transcript; } else { interimTranscript += transcript; } } thisPointer._recState.finalSpeechVal = `${finalTranscript} ${interimTranscript}`.trim(); if (!thisPointer._textableInstance) { thisPointer._targetInput.value = thisPointer._recState.finalSpeechVal; } else { for (var i = 0; i < thisPointer._targetInputList.length; i++) { thisPointer._targetInputList[i].innerText = thisPointer._recState.finalSpeechVal; } } voiceTutElm.innerText = thisPointer._recState.finalSpeechVal; }; this._recState.recognition.onspeechstart = function (e) { let thisPointer = speechInstances[selectedInstanceIndex]; thisPointer._recState.finalSpeechVal = ''; finalTranscript = ''; }; this._recState.recognition.onspeechend = function (e) { let thisPointer = speechInstances[selectedInstanceIndex]; thisPointer._recState.recognition.stop(); }; this._recState.recognition.onend = function (e) { let thisPointer = speechInstances[selectedInstanceIndex]; var voiceTutElm = document.getElementById(thisPointer._voiceTextElmId); if (thisPointer._recState.finalSpeechVal.length >= 2) { if (!thisPointer._textableInstance) { if (thisPointer._targetInput.nodeName.toLowerCase() !== 'input') { thisPointer._targetInput.innerText = thisPointer._recState.finalSpeechVal; } else { thisPointer._targetInput.value = thisPointer._recState.finalSpeechVal; } thisPointer._targetInput.dispatchEvent(new Event('change')); } else { for (var i = 0; i < thisPointer._targetInputList.length; i++) { var inputElm = thisPointer._targetInputList[i]; if (inputElm.nodeName.toLowerCase() !== 'input') { var selectedFontElm = document.getElementsByClassName('note-current-fontname')[0]; var selectedFontSize = document.getElementsByClassName('note-current-fontsize')[0]; inputElm.innerText = thisPointer._recState.finalSpeechVal; if (selectedFontElm) { inputElm.style.fontFamily = selectedFontElm.style.fontFamily; } if (selectedFontSize) { inputElm.style.fontSize = `${selectedFontSize.innerText}px`; } } else { inputElm.value = thisPointer._recState.finalSpeechVal; } inputElm.dispatchEvent(new Event('change')); } } if (thisPointer._targetActionElm) { thisPointer._targetActionElm.click(); } document.body.classList.remove('v_listening'); } if (!thisPointer._recState.finalSpeechVal.length) { voiceTutElm.innerText = thisPointer._recState.noSpeech; thisPointer._listeningTimeout = setTimeout(function () { document.body.classList.remove('v_listening'); }, 1500); } }; this._recState.recognition.onerror = function (e) { let thisPointer = speechInstances[selectedInstanceIndex]; thisPointer._recState.recognition.stop(); console.error('Speech recognition error:', e.error); if (e.error.includes('not-allowed')) { document.body.classList.add('v_speechNotAllowed'); } throw e.error; }; } }; SpeechToTextHelper.prototype.ShowTutorialToolTip = function () { var elm = document.getElementById(`v_voiceInstructionsTip_${this._instanceIndex}`); elm.style.display = 'flex'; }; SpeechToTextHelper.prototype.HideTutorialToolTip = function () { var elm = document.getElementById(`v_voiceInstructionsTip_${this._instanceIndex}`); if (elm) { elm.style.display = 'none'; sessionStorage.setItem(`v_isVoiceTutorialViewed_${this._instanceIndex}`, 'true'); } } SpeechToTextHelper.prototype.AddEventListeners = function () { let selectedInstanceIndex = this._instanceIndex; var speechButton = document.getElementById(this._newVoiceId); this._targetSelectionElm.addEventListener('mouseover', function () { let thisPointer = speechInstances[selectedInstanceIndex]; thisPointer.CheckForTutorial(); }); speechButton.addEventListener('click', function (e) { let thisPointer = speechInstances[selectedInstanceIndex]; if (thisPointer._listeningTimeout) { clearTimeout(thisPointer._listeningTimeout); } thisPointer._recState.finalSpeechVal = ''; let tutorialTxt = document.getElementById(thisPointer._voiceTextElmId); let tutorialInput = thisPointer._targetInput; thisPointer.HideTutorialToolTip(); if (thisPointer._recState.recognition != null && !document.body.classList.contains('v_listening')) { document.body.classList.add('v_listening'); if (tutorialTxt) { tutorialTxt.innerText = thisPointer._recState.listening; } if (tutorialInput) { if (tutorialInput.nodeName.toLowerCase() === 'input') { tutorialInput.setAttribute('placeholder', thisPointer._recState.listening); } else { tutorialInput.innerText = thisPointer._recState.listening; } } thisPointer._recState.recognition.start(); } else { document.body.classList.remove('v_listening'); thisPointer._recState.recognition.stop(); } }); var toolTipCloser = document.getElementById(`v_toolTipCloser_${selectedInstanceIndex}`); toolTipCloser.addEventListener('click', function () { let thisPointer = speechInstances[selectedInstanceIndex]; thisPointer.HideTutorialToolTip(); }); }; SpeechToTextHelper.prototype.CheckForTutorial = function () { let selectedInstanceIndex = this._instanceIndex; let isTutorialViewed = sessionStorage.getItem(`v_isVoiceTutorialViewed_${this._instanceIndex}`); if (isTutorialViewed == null || isTutorialViewed === 'false') { this.ShowTutorialToolTip(); setTimeout(function () { let thisPointer = speechInstances[selectedInstanceIndex]; thisPointer.HideTutorialToolTip(); }, 5000); } };
`; this._targetInput.insertAdjacentHTML('afterend', dHtm); this._targetInput.nextElementSibling.insertAdjacentElement('beforeend', this._targetInput); } this._newVoiceId = `v_searchByVoice_${this._instanceIndex}`; this._voiceTextElmId = `v_voiceTxtEl_${this._instanceIndex}`; var newVoice = document.getElementById(this._newVoiceId); if ((this._targetInput || this._targetInputList) && !newVoice) { let sHtm = ` `; if (!this._textableInstance) { this._targetInput.insertAdjacentHTML('afterend', sHtm); this._targetInput.parentElement.classList.add('v_hasVoiceSearch'); } else { if (this._targetSelectionElm.parentElement === null) { var summernoteToolBar = document.getElementById('summernote-disconnected-toolbar'); if (summernoteToolBar) { var rowTwo = summernoteToolBar.getElementsByClassName('note-row2')[0]; this._targetSelectionElm = rowTwo; } } if (this._targetSelectionElm) { this._targetSelectionElm.insertAdjacentHTML('beforeend', sHtm); this._targetSelectionElm.classList.add('v_hasVoiceSearch'); } else { return true; } } } return false; }; SpeechToTextHelper.prototype.SetupRecognition = function () { let finalTranscript = ''; let voiceTutElm = document.getElementById(this._voiceTextElmId); let selectedInstanceIndex = this._instanceIndex; this._recState.recognition = new this._speechRecognition(); this._recState.recognition.continuous = false; //this._recState.recognition.lang = 'en-US'; this._recState.recognition.interimResults = true; if ((this._targetInput || this._targetInputList) && voiceTutElm) { this._recState.recognition.onresult = function (e) { let thisPointer = speechInstances[selectedInstanceIndex]; let interimTranscript = ""; for (let i = e.resultIndex; i < e.results.length; i += 1) { const { transcript } = e.results[i][0]; if (e.results[i].isFinal) { finalTranscript += transcript; } else { interimTranscript += transcript; } } thisPointer._recState.finalSpeechVal = `${finalTranscript} ${interimTranscript}`.trim(); if (!thisPointer._textableInstance) { thisPointer._targetInput.value = thisPointer._recState.finalSpeechVal; } else { for (var i = 0; i < thisPointer._targetInputList.length; i++) { thisPointer._targetInputList[i].innerText = thisPointer._recState.finalSpeechVal; } } voiceTutElm.innerText = thisPointer._recState.finalSpeechVal; }; this._recState.recognition.onspeechstart = function (e) { let thisPointer = speechInstances[selectedInstanceIndex]; thisPointer._recState.finalSpeechVal = ''; finalTranscript = ''; }; this._recState.recognition.onspeechend = function (e) { let thisPointer = speechInstances[selectedInstanceIndex]; thisPointer._recState.recognition.stop(); }; this._recState.recognition.onend = function (e) { let thisPointer = speechInstances[selectedInstanceIndex]; var voiceTutElm = document.getElementById(thisPointer._voiceTextElmId); if (thisPointer._recState.finalSpeechVal.length >= 2) { if (!thisPointer._textableInstance) { if (thisPointer._targetInput.nodeName.toLowerCase() !== 'input') { thisPointer._targetInput.innerText = thisPointer._recState.finalSpeechVal; } else { thisPointer._targetInput.value = thisPointer._recState.finalSpeechVal; } thisPointer._targetInput.dispatchEvent(new Event('change')); } else { for (var i = 0; i < thisPointer._targetInputList.length; i++) { var inputElm = thisPointer._targetInputList[i]; if (inputElm.nodeName.toLowerCase() !== 'input') { var selectedFontElm = document.getElementsByClassName('note-current-fontname')[0]; var selectedFontSize = document.getElementsByClassName('note-current-fontsize')[0]; inputElm.innerText = thisPointer._recState.finalSpeechVal; if (selectedFontElm) { inputElm.style.fontFamily = selectedFontElm.style.fontFamily; } if (selectedFontSize) { inputElm.style.fontSize = `${selectedFontSize.innerText}px`; } } else { inputElm.value = thisPointer._recState.finalSpeechVal; } inputElm.dispatchEvent(new Event('change')); } } if (thisPointer._targetActionElm) { thisPointer._targetActionElm.click(); } document.body.classList.remove('v_listening'); } if (!thisPointer._recState.finalSpeechVal.length) { voiceTutElm.innerText = thisPointer._recState.noSpeech; thisPointer._listeningTimeout = setTimeout(function () { document.body.classList.remove('v_listening'); }, 1500); } }; this._recState.recognition.onerror = function (e) { let thisPointer = speechInstances[selectedInstanceIndex]; thisPointer._recState.recognition.stop(); console.error('Speech recognition error:', e.error); if (e.error.includes('not-allowed')) { document.body.classList.add('v_speechNotAllowed'); } throw e.error; }; } }; SpeechToTextHelper.prototype.ShowTutorialToolTip = function () { var elm = document.getElementById(`v_voiceInstructionsTip_${this._instanceIndex}`); elm.style.display = 'flex'; }; SpeechToTextHelper.prototype.HideTutorialToolTip = function () { var elm = document.getElementById(`v_voiceInstructionsTip_${this._instanceIndex}`); if (elm) { elm.style.display = 'none'; sessionStorage.setItem(`v_isVoiceTutorialViewed_${this._instanceIndex}`, 'true'); } } SpeechToTextHelper.prototype.AddEventListeners = function () { let selectedInstanceIndex = this._instanceIndex; var speechButton = document.getElementById(this._newVoiceId); this._targetSelectionElm.addEventListener('mouseover', function () { let thisPointer = speechInstances[selectedInstanceIndex]; thisPointer.CheckForTutorial(); }); speechButton.addEventListener('click', function (e) { let thisPointer = speechInstances[selectedInstanceIndex]; if (thisPointer._listeningTimeout) { clearTimeout(thisPointer._listeningTimeout); } thisPointer._recState.finalSpeechVal = ''; let tutorialTxt = document.getElementById(thisPointer._voiceTextElmId); let tutorialInput = thisPointer._targetInput; thisPointer.HideTutorialToolTip(); if (thisPointer._recState.recognition != null && !document.body.classList.contains('v_listening')) { document.body.classList.add('v_listening'); if (tutorialTxt) { tutorialTxt.innerText = thisPointer._recState.listening; } if (tutorialInput) { if (tutorialInput.nodeName.toLowerCase() === 'input') { tutorialInput.setAttribute('placeholder', thisPointer._recState.listening); } else { tutorialInput.innerText = thisPointer._recState.listening; } } thisPointer._recState.recognition.start(); } else { document.body.classList.remove('v_listening'); thisPointer._recState.recognition.stop(); } }); var toolTipCloser = document.getElementById(`v_toolTipCloser_${selectedInstanceIndex}`); toolTipCloser.addEventListener('click', function () { let thisPointer = speechInstances[selectedInstanceIndex]; thisPointer.HideTutorialToolTip(); }); }; SpeechToTextHelper.prototype.CheckForTutorial = function () { let selectedInstanceIndex = this._instanceIndex; let isTutorialViewed = sessionStorage.getItem(`v_isVoiceTutorialViewed_${this._instanceIndex}`); if (isTutorialViewed == null || isTutorialViewed === 'false') { this.ShowTutorialToolTip(); setTimeout(function () { let thisPointer = speechInstances[selectedInstanceIndex]; thisPointer.HideTutorialToolTip(); }, 5000); } };
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    `; document.body.insertAdjacentHTML('beforeend', modalHtml); var content = document.getElementById('ScheduleCallModalContent'); var calendarlyDiv = document.createElement('div'); var scrTag = document.createElement('script'); var maxHeight = window.innerHeight - 100; calendarlyDiv.setAttribute('data-url', calendarlyDataUrl); calendarlyDiv.classList.add('calendly-inline-widget'); calendarlyDiv.style.width = '100%'; calendarlyDiv.style.height = `${(maxHeight < 1175 ? maxHeight : 1175)}px`; calendarlyDiv.id = 'calendarContent'; content.appendChild(calendarlyDiv); scrTag.type = 'text/javascript'; scrTag.src = 'https://assets.calendly.com/assets/external/widget.js'; scrTag.addEventListener('load', function () { ShowModal('ScheduleCallModal'); }); content.appendChild(scrTag); window.addEventListener('resize', HandleWindowResizeForCalandar); calendarCreated = true; } else { ShowModal('ScheduleCallModal'); } }); } }); function HandleWindowResizeForCalandar() { var calendarlyDiv = document.getElementById('calendarContent'); var contentElm = document.getElementById('ScheduleCallModal'); if (calendarlyDiv) { var maxHeight = window.innerHeight - 100; calendarlyDiv.style.height = `${(maxHeight < 1175 ? maxHeight : 1175)}px`; if (window.innerWidth >= 1000) { contentElm.firstChild.style.marginRight = '25%'; contentElm.firstChild.style.marginLeft = '25%'; } else { contentElm.firstChild.style.marginRight = ''; contentElm.firstChild.style.marginLeft = ''; } } else { RemoveResizeEventFromCalandarModal(); } } function RemoveResizeEventFromCalandarModal() { window.removeEventListener('resize', HandleWindowResizeForCalandar); };

    A lever is a simple machine that can be used to lift a heavy load. They consist of a hinge or fulcrum and a rigid beam. Levers can be put into 3 classes depending on the location of the load, effort and fulcrum.

    Lever

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    Lever Mechanics | Principles & Historical Use (6)

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    Innovation of the Lever

    A lever consists of a rigid beam that moves across a hinge or fulcrum. The lever was identified as a simple machine by Archimedes, along with the pulley and screw. Archimedes is often quoted as saying “Give me a place to stand and I will move the Earth.” Levers can exert a large force over a small distance on one end by exerting a small force over a large distance at the other. An ideal lever does not lose or store energy, so the power in is equal to the power out. This relationship can be used to calculate the mechanical advantage as the ratio of the distances from the fulcrum for the effort and the load.

    It is impossible to say who invented the lever. Levers have been used throughout history to lift heavy objects that humans would otherwise not be able to lift. They were used by the ancient Egyptians to move heavy blocks during the construction of the pyramids. Levers are still used in construction today, like when builders remove nails using the claw on a claw hammer, but are also used in many facets of everyday life.


    Three Classes of Levers

    ClassDescriptionExamples
    Class 1 Levers that have the load and the effort on opposite sides of the fulcrum
    • Seesaw
    • Crowbar
    • Scissors
    • Bottle Opener
    • Claw Hammer
    • Shoehorn
    Class 2 Levers that have the load in the middle of the beam, with effort on one side and the fulcrum on the other
    • Wheelbarrows
    • Nutcrackers
    • Nail Clippers
    • Door
    • Diving Board
    • Wrench
    • Stapler
    Class 3 Levers that have the effort in the middle with the load and fulcrum at either end
    • Tweezers
    • Tongs
    • Staple Remover
    • Hockey Stick
    • Shovel
    • Mousetrap
    Lever Mechanics | Principles & Historical Use (7)

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    Levers – Simple Machines for Kids

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    Lever Mechanics | Principles & Historical Use (2024)
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