Physics Midterm Exam Review Quiz

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  • 1/18 Questions

    When we measure how close to perfect a machine is, we are measuring its _____.

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Physics Midterm Exam Review Quiz - Quiz
About This Quiz

This Physics Midterm Exam Review assesses fundamental concepts such as work, power, and mechanical advantage. It tests practical applications, including calculations against gravity, and understanding of historical figures like James Watts. Essential for students reinforcing physics principles.

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  • 2. 

    Power is measure in _______, because the man who invented the steam engine was named ______ _____.  Power (P) is equal to ______ ______ by ______.

    • Joules; James Joule; mass; multiplied; distance

    • Newtons; Isaac Newton; time; multiplied; distance

    • Newtons; Isaac Newton; mass; divided; distance

    • Kilograms; Ken Kilo; work; divided; time

    • Watts; James Watts; work; divided; time

    Correct Answer
    A. Watts; James Watts; work; divided; time
    Explanation
    Answer E is the only choice that correctly fills in all of the blanks.
    Choice D is wrong because of the measurement of power and because of the name of the inventor.

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  • 3. 
    In the image above, what hand does more work. - ProProfs

    In the image above, what hand does more work.

    • A

    • B

    • C

    • A & B are equal and are greater than C

    • No work is done using these three forces.

    Correct Answer
    A. C
    Explanation
    Force C will do the most work because it is entirely in the direction of the motion.

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  • 4. 

    What is a device with moving parts that work together to accomplish a task?

    • Gear

    • Pulley

    • Machine

    • Wheel and axel

    • Lever

    Correct Answer
    A. Machine
    Explanation
    Answer C is the only option that applies here. Answers A, B, D, and E are all example of C.

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  • 5. 

    In a machine, the ______ ______ in newtons, or the force that the machine applies to what you are trying to move, divided by the _____ _____ in newtons, or the force you apply to the machine, is known as the ______ ______ of the machine.

    • Input force; output force; work done

    • Input force; output force; power used

    • Output force; input force; work done

    • Output force; input force; power used

    • Output force; input force; mechanical advantage

    Correct Answer
    A. Output force; input force; mechanical advantage
    Explanation
    Answers A & B are incorrect because of the order of forces (both list input then output, but the question calls for output then input). All choices that list work done or power used are incorrect because of these words. This leaves choice C as the only correct answer.

    NOTE THAT THIS DOES NOT APPLY TO LEVERS OR GEARS OR RAMPS

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  • 6. 

    Which of the following is a calculation of work?

    • Work (j) = Forece (N) x distance (m)

    • Work (j) = Forece (N) / distance (m)

    • Work (N) = Forece (j) x distance (m)

    • Work (N) = Mass (kg) x Gravity x Height (m)

    • Both 'A' and 'D' are correct.

    Correct Answer
    A. Both 'A' and 'D' are correct.
    Explanation
    Answer A will provide work while not going against gravity, say sliding a book on a table.
    Answer B will provide work while going against gravity, like sliding a book up a ramp.

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  • 7. 

    Alexander has a mass of 70 kilograms. HIs apartment is on the second floor, 5 meters up from ground level. How much work does he do against gravity each time e clims the stairs to his apartment?

    • 70N

    • 9.8N

    • 5m

    • 686N

    • None of the above

    Correct Answer
    A. 686N
    Explanation
    W=FD
    W=70kg x 9.8m/s/s
    W=686N

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  • 8. 

    How do you find the mechanical advantage of a lever? Remember to include units in your answer.

  • 9. 

    Describe the three classes of levers. Include the location of the fulcrum and the amount of force that is input and output for each class.

  • 10. 

    How do you fid the gear ratio?

  • 11. 

    How do you find the mechanical advantage of a ramp?

  • 12. 

    How do you find the mechanical advantage of a screw?

  • 13. 

    Efficiency is measured in percentages. Why is no machine 100% efficient? Copy the text below (including the dashes), paste it into your answer and then use one word.Some energy is lost to ________ in all machines.--

  • 14. 

    The efficiency is less than 100% for virtually all process that do what?

  • 15. 

    A simple machine has a mechanical advantage of 5. If the output force is 10N, what is the input force?

  • 16. 

    The _____ _____ of a machine can never be _____ than the ______ ______. When you design a machine that multiplies force, you pay by having to apply the force over a ______ distance.

    Correct Answer
    distance, greater, input, output, work, work, force, force, initial, final, greater
    Explanation
    The output work of a machine can never be greater than the input work. When you design a machine that multiplies force, you pay by having to apply the force over a greater distance.

    Nature does not give something for nothing. You cannot get more than what you have.

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  • 17. 

    The force in a rope is called the ____.

    Correct Answer
    mechanical advantage, output work, force, tension, height, teeth
    Explanation
    The answer is tension.

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  • 18. 

    Any process that is not 100% efficient is ___________

    Correct Answer
    impossible, irreversible, reversible
    Explanation
    Because some energy cannot get back into potential or kinetic energy, any process with less than 100% efficiency is irreversible.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 04, 2009
    Quiz Created by
    Alexnahon
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