Physics�Dynamics: Forces

Science and Mathematics Education Research Group

Supported by UBC Teaching and Learning Enhancement Fund 2012-2013

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Department of

Curriculum and Pedagogy

FACULTY OF EDUCATION

In all the questions that follow the masses of the blocks are equal and will be denoted as m. However, the angles of the incline are different, thus:

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1. 1
2. 2
3. 3
4. 4

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How many forces are acting on the block labelled A? The coefficient of static friction between the block and the pyramid is μ_s=0.01.

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Based on your intuition, what direction do you expect the blocks to move if they move at all? Think why you expect it.

Recall:

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1. Left
2. Right
3. Cannot be determined without knowing their mass
4. Cannot be determined without knowing μ_k.

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What is component of the gravitational force along the incline acting on block A? Recall:

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What is the correct expression for the force of friction acting on block A? Recall:

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What is component of the gravitational force along the incline acting on block B? Recall:

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Recalling that blocks A and B have the same mass. What is the correct expression for the acceleration of block A?

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1. g(sinθ_B - sinθ_A) - μg(cosθ_B - cosθ_A)
2. g(sinθ_B + sinθ_A) - μg(cosθ_B + cosθ_A)
3. g(sinθ_B - sinθ_A) - μg(cosθ_B + cosθ_A)
4. None of the above

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Recalling that blocks A and B have the same mass. What is the correct expression for the acceleration of block B?

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1. g(sinθ_B - sinθ_A) - μg(cosθ_B - cosθ_A)
2. g(sinθ_B + sinθ_A) - μg(cosθ_B + cosθ_A)
3. g(sinθ_B - sinθ_A) - μg(cosθ_B + cosθ_A)
4. None of the above

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