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– Good morning. Today we’re going to review the dynamics portion of the AP Physics C Mechanics Curriculum. You know, Newtons three laws and friction and stuff. – Don’t say, “And stuff,” just say, “Newton’s laws and friction.” ♫ Flipping Physics – Billy, what is Newton’s First Law? – When viewed from an inertial reference

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mr.p: Good morning, today we’re going to review the dynamics topics covered on the AP Physics I exam. Dynamics is the study of the motion of objects and the forces causing those motions. Bo: Hey guys Billy: Hey Bo. Bobby: Hi Bo. ♫ flipping physics ♫ mr.p: Bo, what is the difference between inertial and

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[MUSIC PLAYING] Have you ever seen anybody unicycling, maybe wondered how does anybody balance on that thing? Maybe you were like, I got this, and tried it yourself. But if you’ve ever tried unicycling, you’d probably agree that riding on one wheel doesn’t start easy. So how does anyone balance on a unicycle? Well, the

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hello again it's good to be back with you today I've got a problem for us on static friction now I think we all know what friction is friction is the shear force that's generated when one object tries to slide across another one there's actually static and dynamic friction and a lot of materials

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hey doing a mr. rose and today we'll be working out of a problem at a chapter 4 number 57 from University Physics youngin Freeman on the 13th edition so hopefully with a copy of this book around again I'm not gonna read you the entire problem and like always I always suggest you trying

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– Good morning, today we are going to use Newton's second law, tofind the force of friction between a street hockeypuck, and a wooden board. – Hey guys. – [Billy] Hey Bo,– [Bobby] Hi Bo. ♫ Flipping Physics ♫ I know we haven't specifically defined the force of friction yet. However we can still find

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all right in this video I am just doing an example on how to use the method of joints to solve a truss problem in statics so here we have right trust it's pretty simple there's just one externally applied force here and it's simply supported all of the members in the truss or one

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– Good morning. Today we are going to determine the minimum angular speed to spin a bucket in a vertical circle, such that water will stay in the bucket. ♫ Flipping Physics ♫ – Didn't we do this already? – Yep, twice. – Actually, no, we havedetermined why water stays in the bucket and analyzedthe

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(。・∀・)ノ゙早上好!今天我将 表演一个单人魔术。 P先生,你真的要这样吗? *Flipping Physics* 当然啦!不过首先,我们要做一些物理。 肯定,这才正常。 首先我们要确定桌子是水平的。 这么做是因为我们要求斜面的倾角。 板子的长度是70.5厘米。 板子末端的竖直高度是15.9厘米。 Bo,请用这些信息 求斜面的倾角。 好的。θ的正弦是对边比斜边, 对边是15.9厘米, 斜边是70.5厘米。 将等式两边同时带入正弦函数的反函数, 这样会给我们斜面倾角θ,是 反正弦函数arcsin(15.9/70.5)。 结果是13.0342度。 现在,我们知道了斜面倾角, Bobby你能告诉我 物块受的所有力吗? 弹力垂直于斜面向上, 静摩擦力平行于斜面向上, 重力竖直向下。 谢谢你Bobby。注意 在分解力之前你应当先画出受力分析图, 然后再画出带分力的受力分析图。 现在,我们分解重力。 好,将重力进行分解—— 我们有垂直于斜面向下的垂直重力分力 我们有垂直于斜面向下的垂直重力分力 和平行于斜面向下的平行重力分力。 和平行于斜面向下的平行重力分力。 现在让我们使用牛顿第二定律来计算 这些力的大小。 哦在这之前,我们需要物块的质量。 物块的质量是121克,转换成千克是 0.121千克。 这就是物块的质量。 Bobby,请给出牛顿第二定律表达式。 y方向的合力——不,等等, 垂直方向的合外力为 弹力减去垂直重力分力, 也就是垂直方向上的质量×加速度。 物块的加速度在所有方向上 均为0,因为物块是静止的,所以 弹力等于垂直重力分力。 我们知道垂直重力分力的值 它是质量乘以 重力加速度乘以θ的余弦值。 所以它是0.121×9.81×cos(13.0342) 0.121×9.81×cos(13.0342),等于1.15643 精确到3个有效数字的话是1.16N。

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