{"id":21788,"date":"2024-04-15T06:11:02","date_gmt":"2024-04-15T06:11:02","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=21788"},"modified":"2024-04-15T06:11:02","modified_gmt":"2024-04-15T06:11:02","slug":"it-is-easier-to-roll-a-barrel-full-of-coal-tar-than-to-pull-it-because-a-the-full-weight-of-the-barrel-comes-into-play-when-it-is-pulled-b-the-rolling-friction-is-much-less-than-the-sliding-friction","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/it-is-easier-to-roll-a-barrel-full-of-coal-tar-than-to-pull-it-because-a-the-full-weight-of-the-barrel-comes-into-play-when-it-is-pulled-b-the-rolling-friction-is-much-less-than-the-sliding-friction\/","title":{"rendered":"It is easier to roll a barrel full of coal tar than to pull it because A. the full weight of the barrel comes into play when it is pulled B. the rolling friction is much less than the sliding friction C. more surface area of the barrel is in contact with the road when it is pulled D. coal tar is a liquid and it flows in the barrel when it is rolled"},"content":{"rendered":"<p>\r\n    <!-- Check if it's an AMP page -->\r\n            <!-- Non-AMP version -->\r\n        <div class=\"mcq-container\" data-quiz-id=\"quizState_6a979fbe19d19\">\r\n                                            <div class=\"option\" data-option-key=\"option1\" data-is-correct=\"false\">\r\n                    the full weight of the barrel comes into play when it is pulled                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option2\" data-is-correct=\"true\">\r\n                    the rolling friction is much less than the sliding friction                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option3\" data-is-correct=\"false\">\r\n                    more surface area of the barrel is in contact with the road when it is pulled                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option4\" data-is-correct=\"false\">\r\n                    coal tar is a liquid and it flows in the barrel when it is rolled                <\/div>\r\n                            \r\n            <!-- Feedback messages for non-AMP -->\r\n            <div class=\"feedback\" data-feedback=\"wrong\">Answer is Right!<\/div>\r\n            <div class=\"feedback\" data-feedback=\"right\">Answer is Wrong!<\/div>\r\n        <\/div>\r\n\r\n        <script>\r\n        document.addEventListener('DOMContentLoaded', function () {\r\n            var containers = document.querySelectorAll('.mcq-container');\r\n\r\n            containers.forEach(function(container) {\r\n                var options = container.querySelectorAll('.option');\r\n                var feedbackSelect = container.querySelector('[data-feedback=\"select\"]');\r\n                var feedbackWrong = container.querySelector('[data-feedback=\"wrong\"]');\r\n                var feedbackRight = container.querySelector('[data-feedback=\"right\"]');\r\n\r\n                options.forEach(function(option) {\r\n                    option.addEventListener('click', function() {\r\n                        var selectedOption = option.getAttribute('data-option-key');\r\n                        var isCorrect = option.getAttribute('data-is-correct') === 'true';\r\n\r\n                        \/\/ Remove previous selections\r\n                        options.forEach(function(opt) {\r\n                            opt.classList.remove('correct', 'incorrect');\r\n                        });\r\n\r\n                        \/\/ Add the correct\/incorrect class\r\n                        if (isCorrect) {\r\n                            option.classList.add('correct');\r\n                            feedbackRight.hidden = false;\r\n                            feedbackWrong.hidden = true;\r\n                        } else {\r\n                            option.classList.add('incorrect');\r\n                            feedbackRight.hidden = true;\r\n                            feedbackWrong.hidden = false;\r\n                        }\r\n\r\n                        \/\/ Hide select feedback\r\n                        feedbackSelect.hidden = true;\r\n                    });\r\n                });\r\n            });\r\n        });\r\n        <\/script>\r\n    \r\n    <!--more--><\/p>\n<p>The correct answer is: B. the rolling friction is much less than the sliding friction.<\/p>\n<p>When an object rolls, the only force that opposes its motion is rolling friction. Rolling friction is much less than sliding friction because the contact area between the object and the surface is much smaller. <div class=\"telegram-channel-container\">\r\n        <a href=\"https:\/\/t.me\/pscnotes2025\" target=\"_blank\" class=\"telegram-channel-button\">\r\n            <span class=\"telegram-icon\">\r\n                <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 496 512\">\r\n                    <path fill=\"white\" d=\"M248,8C111,8,0,119,0,256s111,248,248,248s248-111,248-248S385,8,248,8z M362,177L320,367c-3,14-10,18-20,14l-56-41l-27,26 c-3,3-5,5-10,5l4-63L323,196c5-5-1-7-8-3l-98,62l-42-13c-9-3-10-9,2-14l162-63C351,160,365,164,362,177z\"\/>\r\n                <\/svg>\r\n            <\/span>\r\n            Join Our Telegram Channel\r\n        <\/a>\r\n    <\/div> This is because the object rolls on a small contact patch, while when it slides, the entire surface of the object is in contact with the surface.<\/p>\n<p>The other options are incorrect because:<\/p>\n<ul>\n<li>A. the full weight of the barrel comes into play when it is pulled. This is true, but it does not explain why it is easier to roll the barrel than to pull it.<\/li>\n<li>C. more surface area of <div class=\"youtube-subscribe-container\">\r\n        <a href=\"https:\/\/www.youtube.com\/channel\/UCNHT8lW-JmLC68rjBfZhdkg?sub_confirmation=1\" target=\"_blank\" class=\"youtube-subscribe-button\">\r\n            <span class=\"youtube-icon\">\r\n                <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 576 512\">\r\n                    <path d=\"M549.7 124.1c-6.3-23.7-24.8-42.3-48.3-48.6C458.8 64 288 64 288 64S117.2 64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z\"\/>\r\n                <\/svg>\r\n            <\/span>\r\n            Subscribe on YouTube\r\n        <\/a>\r\n    <\/div> the barrel is in contact with the road when it is pulled. This is also true, but it does not explain why it is easier to roll the barrel than to pull it.<\/li>\n<li>D. coal tar is a liquid and it flows in the barrel when it is rolled. This is true, but it does not explain why it is easier to roll the barrel than to pull it.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Join Our Telegram Channel Subscribe on YouTube<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.2 (Yoast SEO v23.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>It is easier to roll a barrel full of coal tar than to pull it because A. the full weight of the barrel comes into play when it is pulled B. the rolling friction is much less than the sliding friction C. more surface area of the barrel is in contact with the road when it is pulled D. coal tar is a liquid and it flows in the barrel when it is rolled<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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