Chapter 8 Test - Craig Fisher | Library

MULTIPLE CHOICE
- Complete the following questions by clicking on the correct answer. Only one answer is correct. (2 pts. each)  

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What is the work that you do on a machine?

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Which of the following in the comparison of a machines's work output with the work input?

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Which equation would you use to find mechanical advantage?

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In which situation is a person doing work on an object?

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If a barbell weighs 160 N, what other information do you need to calculate how much work it takes to lift it?

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How does a ramp make lifting a heavy object easier?

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If the work output of a machine is always less that the work input, where does the missing work go?

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Which of the following is NOT a wedge/

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A construction worker is lifting a load of bricks onto a truck. He does 200 J of Work in 40 seconds. What is his power output?

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Which of the following machines always has a mechanical advantage of less than 1?

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What is the rate at which power is transferred?

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What do you call the number of times a machine multiplies force?

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What is a machine that is made of two simple machines?

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What is a machine with a grooved wheel that holds a cable?

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A moving object has what kind of energy?

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Which of the following would increase the mechanical advantage of a first-class lever?

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Chris and Jane are lifting boxes to put them on shelves. Chris does 200 J of work in 5 minutes and Jane does 200 J of work in 4 minutes. What is the difference between the two jobs?

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When a screwdriver is used as a lever to open a paint can, what is changed as the work is done?

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The mechanical advantage of a ________________ can be found by dividing the radius of the wheel with the radius of the axle.

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The greater the ration of the inclined plane's length to its height, the greater the

COMPLETION
 -Complete the following questions by selecting the correct answer from the word bank. Misspelled words will be marked as incorrect. Some answers may be used more than once, others may not be used at all. (2 pts. each) 

inclined plane	kinetic
input	2nd Class
fixed	rope segments

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After you exert a force on an object, it then moves and has ___________ energy

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A ____________ lever places the load between the input force and the fulcrum.

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Second and third class levers do not change the direction of the __________ force

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A __________ pulley is attached to something so it does not move.

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The mechanical advantage of a block and tackle pulley depends upon the number of _______________________.

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If you could unwind a screw, you would find to os actually a(n) ____________________?

work input	joule
mechanical advantage	lever
mechanical efficiency	compound machine

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A block and tackle is an example of a(n) ___________________?

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The work you do on a machine such as turning a screwdriver is called _________________?

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Because of friction, the _______________ of a machine is always less than 100 percent

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A bar that pivots on a fulcrum is called a(n)______________?

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The SI unit equivalent to 1 Newton-meter is called a(n) ____________________?

kinetic	machines
work	ideal machines
distance

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A moving bowling ball has ___________ energy?

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You need the same amount of __________ to raise a car up a cliff as to push it up a hill.

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Friction is why __________________ machines aren't 100% efficient.

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A machine that had 100% mechanical efficiency would be a(n) ________________?

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What is the main difference between the three classes of lever?

MATCHING
 -Complete the following matching questions by clicking on the correct answer. Only one answer is correct. (2 pts. each)  

a. watt	h. wheel and axle
b. machine	i. work output
c. work	j. mechanical advantage
d. mechanical efficiency	k. joule
e. pulley	l. compound machine
f. power	m. lever
g. work input

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comparing a machine's work output with work input

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product of the output force and the distance through which it is exerted

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unit used to express power

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device that makes work easier by changing the size or direction of a force

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unit used to express work

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machine with two circular devices of different sizes

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machine made of two or more simple machines

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transfer of energy that causes an object to mover in the direction of the force

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the rate at which energy is transferred

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number of times a machine multiples force

 
SHORT ANSWER
-Write in complete sentences to answer the following questions. One or two word responses will earn NO credit. Logically connect your thoughts and answer the question that is asked, not the question you think has been asked! (2 pts. each)

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Explain why a pair of scissors is a compound machine.

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If a person holds a rock over his or her head, how much work is being performed on the rock? Explain.

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Pat is removing nails from a piece of wood with the claw end of hammer. What type of simple machine is he using? Explain.

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How do you find the mechanical advantage of a wedge

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