AP Physics 1 Unit 3B: Potential Energy & Conservation of Energy — practice questions — page 4

Explore 92 free Unit 3B: Potential Energy & Conservation of Energy 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 3B: Potential Energy & Conservation of Energy questions and exercises with answers

Showing questions 91–92 of 92.

A ball striking a wall at an angle keeps one momentum component unchanged and reverses:Read the answer and worked solution →The ballistocardiograph worked by detecting the body's recoil when the heart:Read the answer and worked solution →

Worked practice questions

A ball striking a wall at an angle keeps one momentum component unchanged and reverses:

Only its total magnitude
The perpendicular component
Both of the components
Neither of the components

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Correct answer: B. The perpendicular component

1. Choosing axes along and across the wall separates the problem into two independent parts. 2. The wall can only push perpendicular to itself, so only that component changes. 3. The second ball continues with the same momentum component in the direction along the wall. 4. It reverses its component perpendicular to the wall. 5. Keeping in mind the proportionality between velocity and momentum makes the sketch straightforward. _Source: OpenStax College Physics for AP(R) Courses 2e (CC BY 4.0), Ch 8 'Linear Momentum and Collisions', sections 8.1-8.7_

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The ballistocardiograph worked by detecting the body's recoil when the heart:

Cools the surrounding tissue
Emits an electrical signal
Forces blood into the aorta
Absorbs oxygen from the lungs

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Correct answer: C. Forces blood into the aorta

1. The device was a diagnostic tool used in the second half of the twentieth century to study the strength of the heart. 2. About once a second, your heart beats, forcing blood into the aorta. 3. A force in the opposite direction is exerted on the rest of your body, by Newton's third law. 4. That tiny whole-body recoil is what the instrument measured. 5. The electrocardiogram and the echocardiogram are more widely used in cardiology today. _Source: OpenStax College Physics for AP(R) Courses 2e (CC BY 4.0), Ch 8 'Linear Momentum and Collisions', sections 8.1-8.7_

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