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AP Physics 1 Work, Energy, and Energy Resources — practice questions

Explore 75 free Work, Energy, and Energy Resources questions in AP Physics 1 Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Work, Energy, and Energy Resources questions and exercises with answers

Showing questions 1–30 of 75.

A 30.0-kg package on a roller belt conveyor moves at 0.500 m/s. What is its kinetic energy?Read the answer and worked solution →A roller coaster starts from rest at the top of a 20.0 m hill, with friction assumed negligible. What is its final speed at the bottom, taking g = 9.80 m/s^2?Read the answer and worked solution →Power is defined as the rate at which what physical quantity is done or transferred?Read the answer and worked solution →In SI units, the watt is the unit of power. How is one watt related to the joule and the second?Read the answer and worked solution →A 0.200-kW computer runs 6.00 hours per day for 30.0 days, with electricity priced at $0.120 per kilowatt-hour. What is the total cost for the month?Read the answer and worked solution →Power output of devices such as electric motors is sometimes expressed in horsepower instead of watts. How many watts equal one horsepower?Read the answer and worked solution →Among the body's organs, the basal metabolic rate is divided unevenly. Which organ system receives the largest single share of that resting energy budget?Read the answer and worked solution →About what fraction of the calories a person burns in a day go toward sustaining basic body functions included in the basal metabolic rate?Read the answer and worked solution →Among the principal energy resources used worldwide, which single fuel supplies about 40% of the world's energy, with much of it going to transportation?Read the answer and worked solution →Only 10% of United States electricity is generated by renewable resources. Which renewable source supplies most of that 10%?Read the answer and worked solution →Which of Newton's laws is it?Read the answer and worked solution →Mass or weight?Read the answer and worked solution →True or false: forces and motionRead the answer and worked solution →Work the force numbersRead the answer and worked solution →Complete Newton's lawsRead the answer and worked solution →The study of motion without considering its causes is:Read the answer and worked solution →To describe the position of a passenger walking inside an airplane, the most convenient reference frame is:Read the answer and worked solution →Displacement is defined as the change in an object's:Read the answer and worked solution →The SI unit for displacement is the:Read the answer and worked solution →A professor moves from x = 1.5 m to x = 3.5 m. Her displacement is:Read the answer and worked solution →A professor paces 150 m during a lecture but ends 2.0 m right of her start. Her distance traveled is:Read the answer and worked solution →A cyclist rides 3 km west then 2 km east. The magnitude of the displacement is:Read the answer and worked solution →A quantity with both magnitude and direction, such as a velocity of 90 km/h east, is a:Read the answer and worked solution →A 20 degree temperature, a 1.8 m height and a 2.0 m distance are all:Read the answer and worked solution →Which quantity is never represented by an arrow?Read the answer and worked solution →Once you assign a positive direction in a problem, you:Read the answer and worked solution →The SI unit for time is the:Read the answer and worked solution →A lecture runs from 11:00 to 11:50 AM. The elapsed time is:Read the answer and worked solution →Average velocity is displacement divided by:Read the answer and worked solution →An airplane passenger moves -4 m in 5 seconds. His average velocity is:Read the answer and worked solution →

Worked practice questions

A 30.0-kg package on a roller belt conveyor moves at 0.500 m/s. What is its kinetic energy?

  1. 15.0 J
  2. 7.50 J
  3. 3.75 J
  4. 0.500 J
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Correct answer: C. 3.75 J

1. Kinetic energy is KE = one half m v squared. 2. Substituting the given values, KE = (0.5)(30.0 kg)(0.500 m/s)^2. 3. Squaring the speed gives 0.250 m^2/s^2, and multiplying by 0.5 times 30.0 kg gives KE = 3.75 J. 4. 15.0 J and 7.50 J come from forgetting to square the speed or forgetting the factor of one half, and 0.500 J is simply the speed left as if it were the answer. _Source: OpenStax College Physics (CC BY 4.0), Ch 7 "Work, Energy, and Energy Resources", section 7.2 Kinetic Energy and the Work-Energy Theorem_

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A roller coaster starts from rest at the top of a 20.0 m hill, with friction assumed negligible. What is its final speed at the bottom, taking g = 9.80 m/s^2?

  1. 14.0 m/s
  2. 9.80 m/s
  3. 19.8 m/s
  4. 39.2 m/s
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Correct answer: C. 19.8 m/s

1. With friction negligible, the loss in gravitational potential energy equals the gain in kinetic energy, mg times the height h equals one half m v squared. 2. The mass cancels, leaving v equal to the square root of 2 times g times h. 3. Substituting the values, v = the square root of 2 times 9.80 m/s^2 times 20.0 m, which is the square root of 392 m^2/s^2. 4. Taking that square root gives v = 19.8 m/s. 5. 39.2 m/s comes from forgetting to take the square root, and 14.0 m/s and 9.80 m/s come from arithmetic slips inside the square root or from using g directly as if it were the speed. _Source: OpenStax College Physics (CC BY 4.0), Ch 7 "Work, Energy, and Energy Resources", section 7.3 Gravitational Potential Energy_

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Power is defined as the rate at which what physical quantity is done or transferred?

  1. Force applied
  2. Distance moved
  3. Object's mass
  4. Work performed
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Correct answer: D. Work performed

1. Power is defined as the rate at which work is done, P = W/t. 2. Because work is a transfer of energy, power is equally the rate at which energy is expended. 3. Force, distance, and mass are quantities that appear inside the definition of work itself, but none of them alone is what power measures the rate of. 4. Only work, divided by the time it takes, correctly defines power. _Source: OpenStax College Physics (CC BY 4.0), Ch 7 "Work, Energy, and Energy Resources", section 7.7 Power_

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More Physics topics

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