AP Physics 1 Unit 2B: Friction, Gravitational and Normal Forces — practice questions — page 4

Explore 92 free Unit 2B: Friction, Gravitational and Normal Forces questions in AP Physics 1 Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 2B: Friction, Gravitational and Normal Forces questions and exercises with answers

Showing questions 91–92 of 92.

As per your syllabus, a rigid body's general motion can be decomposed into which two kinds?Read the answer and worked solution →As per your syllabus, when the origin of coordinates is chosen at the centre of mass, what does Σ m_i r_i equal?Read the answer and worked solution →

Worked practice questions

As per your syllabus, a rigid body's general motion can be decomposed into which two kinds?

Translation of CM + rotation about CM
Pure translation alone for rigid bodies
Pure rotation alone (no translation)
Random vibration alone

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Correct answer: A. Translation of CM + rotation about CM

Your syllabus: any rigid body motion = translation of CM + rotation about an axis through CM. Rolling cylinder is the canonical example.

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As per your syllabus, when the origin of coordinates is chosen at the centre of mass, what does Σ m_i r_i equal?

M times CM position
Half of total mass
Total moment of inertia
Zero

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Correct answer: D. Zero

Your syllabus / eqn 6.4d: by definition of CM, Σ m_i (r_i − R) = 0 ⇒ Σ m_i r_i = 0 if origin at CM.

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