Скачать или смотреть 2024 AP Physics 1 Free Response Q # 3 | Easy Explained, Work Shown, High-Score Method

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In this video, I explain AP Physics 1 Free Response Question [2024] Question [3] in a simple, clear, and student-friendly way. This lesson includes step-by-step reasoning, exam-style solving, and easy-to-understand explanations to help you score maximum points on the AP Physics 1 exam.

3. (12 points, suggested time 25 minutes)
The left end of a uniform beam of mass M and length L is attached to a wall by a hinge, as shown in Figure 1. One end of a string with negligible mass is attached to the right end of the beam. The other end of the string is attached to the wall above the hinge at Point 1. The beam remains horizontal. The hinge exerts a force on the beam of magnitude FH, and the angle between the beam and the string is θ = θ1.
(a) The following rectangle represents the beam in Figure 1. On the rectangle, draw and label the forces (not components) exerted on the beam. Draw each force as a distinct arrow starting on, and pointing away from, the point at which the force is exerted.
(b) The string is then attached lower on the wall, at Point 2, and the beam remains horizontal, as shown in Figure 2. The angle between the beam and the string is θ = θ2. The dashed line represents the string shown in Figure 1. The magnitude of the tension in the string shown in Figure 1 is FT1. The magnitude of the tension in the string shown in Figure 2 is FT2. Indicate which of the following correctly compares FT2 with FT1.
_______FT2 greater than FTI _______FT2 less than FT1 _______FT2 = FTI
Briefly justify your answer, using qualitative reasoning beyond referencing equations.
(c) Starting with Newton's second law in rotational form, derive an expression for the magnitude of the tension in the string. Express your answer in terms of M, θ, and physical constants, as appropriate. Begin your derivation by writing a fundamental physics principle or an equation from the reference book.
(d) Is your derived equation in part (c) consistent with your justification in part (b)? Explain your reasoning.
(e) The string is cut, and the beam begins to rotate about the hinge with negligible friction. On the following axes, sketch the angular speed of the beam as a function of time for the time interval while the beam falls but before the beam becomes vertical.


My goal is to help students understand physics concepts without stress.
English is not my native language, so please excuse any pronunciation mistakes or speaking errors , thank you for understanding! 😊

This video is perfect for:
Students preparing for AP Physics 1 FRQs
Quick revision before exams
Learning how to show proper work and reasoning
Understanding scoring guidelines and common mistakes
Practicing physics problem-solving the right way

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