AP Physics 1 Unit 3A: Work and Kinetic Energy Theorem — practice questions — page 4

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Unit 3A: Work and Kinetic Energy Theorem questions and exercises with answers

Showing questions 91–92 of 92.

Elapsed time is calculated as:Read the answer and worked solution →A car's speedometer shows which quantity?Read the answer and worked solution →

Worked practice questions

Elapsed time is calculated as:

Ending time minus beginning
Beginning time minus ending
Ending time plus beginning
Ending time times beginning

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Correct answer: A. Ending time minus beginning

1. Time intervals, like displacements, are differences between two readings. 2. Elapsed time is the difference between the ending time and the beginning time. 3. If the starting time is taken to be zero, the elapsed time is simply the final clock reading. 4. Subtracting in the other order would give a negative interval for forward motion. _Source: OpenStax College Physics for AP(R) Courses 2e (CC BY 4.0), Ch 2 'Kinematics', sections 2.1-2.8_

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A car's speedometer shows which quantity?

The total displacement so far
Magnitude of instantaneous velocity
Direction of the velocity
The average velocity so far

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Correct answer: B. Magnitude of instantaneous velocity

1. Instantaneous velocity is the velocity at one particular moment. 2. A speedometer needle responds to how fast the wheels turn right now. 3. A car's speedometer shows the magnitude, but not the direction, of the instantaneous velocity of the car. 4. Magnitude without direction is exactly what speed means. _Source: OpenStax College Physics for AP(R) Courses 2e (CC BY 4.0), Ch 2 'Kinematics', sections 2.1-2.8_

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