- Complete the following questions by clicking on the correct answer. Only one answer is correct. (2 pts. each)
Question 1
1.
Question 2
2.
Question 3
3.
Question 4
4.
Question 5
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Question 6
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Question 7
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Question 8
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Question 9
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Question 10
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Question 11
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Question 12
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Question 13
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Question 14
14.
Question 15
15.
Question 16
16.
Question 17
17.
Question 18
18.
Question 19
19.
Question 20
20.
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)
Question 21
21.
After you exert a force on an object, it then moves and has ___________ energy
Question 22
22.
A ____________ lever places the load between the input force and the fulcrum.
Question 23
23.
Second and third class levers do not change the direction of the __________
force
Question 24
24.
A __________ pulley is attached to something so it does not move.
Question 25
25.
The mechanical advantage of a block and tackle pulley depends upon the number of
_______________________.
Question 26
26.
If you could unwind a screw, you would find to os actually a(n)
____________________?
Question 27
27.
A block and tackle is an example of a(n) ___________________?
Question 28
28.
The work you do on a machine such as turning a screwdriver is called
_________________?
Question 29
29.
Because of friction, the _______________ of a machine is always less than 100
percent
Question 30
30.
A bar that pivots on a fulcrum is called a(n)______________?
Question 31
31.
The SI unit equivalent to 1 Newton-meter is called a(n) ____________________?
Question 32
32.
A moving bowling ball has ___________ energy?
Question 33
33.
You need the same amount of __________ to raise a car up a cliff as to push it
up a hill.
Question 34
34.
Friction is why __________________ machines aren't 100% efficient.
Question 35
35.
A machine that had 100% mechanical efficiency would be a(n) ________________?
Question 36
36.
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)
Question 37
37.
comparing a machine's work output with work input
Question 38
38.
product of the output force and the distance through which it is exerted
Question 39
39.
unit used to express power
Question 40
40.
device that makes work easier by changing the size or direction of a force
Question 41
41.
unit used to express work
Question 42
42.
machine with two circular devices of different sizes
Question 43
43.
machine made of two or more simple machines
Question 44
44.
transfer of energy that causes an object to mover in the direction of the force
Question 45
45.
the rate at which energy is transferred
Question 46
46.
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)
Question 47
47.
Explain why a pair of scissors is a compound machine.
Question 48
48.
If a person holds a rock over his or her head, how much work is being performed
on the rock? Explain.
Question 49
49.
Pat is removing nails from a piece of wood with the claw end of hammer. What
type of simple machine is he using? Explain.
Question 50
50.
How do you find the mechanical advantage of a wedge
Do NOT forget to turn in this assignment on Google Classroom after you have submitted it here! No credit will be awarded for unsubmitted assignments.
What is the work that you do on a machine?
A power
B work input
C work output
D lever
Which of the following in the comparison of a machines's work output with the
work input?
A mechanical efficiency
B force
C mechanical advantage
D power
Which equation would you use to find mechanical advantage?
A MA=work output/work input X 100
B MA=output force/input force
C MA=work input/output force
D MA= inout force/output force
In which situation is a person doing work on an object?
A A school crossing guard raises a stop sign that weighs 10 N.
B A student walks while wearing a backpack that weighs 10 N.
C A man exerts 350 N force on a rope attached to a house.
D A worker holds a box 1 m off the floor.
If a barbell weighs 160 N, what other information do you need to calculate how
much work it takes to lift it?
A the shape of the weights
B how high the barbell is being lifted
C the strength of the person doing the lifting
D the amount of output force
How does a ramp make lifting a heavy object easier?
A the object is moved over a shorter distance.
B the ramp increases the amount of work you do.
C less force is needed to move the object over a longer distance
D more force is needed to move the object over a linger distance
If the work output of a machine is always less that the work input, where does
the missing work go?
A it is used to get the machine started
B it is used to overcome the friction created by the machine
C it is used to keep the machine running
D there isn't enough power present
Which of the following is NOT a wedge/
A knife
B plow
C chisel
D ramp
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?
A 50 J
B 5 J
C 50 W
D 5 W
Which of the following machines always has a mechanical advantage of less than
1?
A wheel and axle
B third-class lever
C a long, thin wedge
D a poorly lubricated, movable pulley
What is the rate at which power is transferred?
A power
B energy
C work
D joule
What do you call the number of times a machine multiplies force?
A mechanical efficiency
B work
C mechanical advantages
D power
What is a machine that is made of two simple machines?
A simple machine
B lever
C pulley
D compound machine
What is a machine with a grooved wheel that holds a cable?
A lever
B pulley
C wheel and axle
D wedge
A moving object has what kind of energy?
A forced
B work
C moving
D kinetic
Which of the following would increase the mechanical advantage of a first-class
lever?
A apply a greater input force
B increasing the rate at which force is applied
C decreasing the load
D moving the fulcrum closer to the load
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?
A the inout force
B the output force
C the work
D the power
When a screwdriver is used as a lever to open a paint can, what is changed as
the work is done?
A size of the input force
B direction of the input force
C size and direction of the input force
D power
The mechanical advantage of a ________________ can be found by dividing the
radius of the wheel with the radius of the axle.
A wheel and axle
B pulley
C lever
D inclined plane
The greater the ration of the inclined plane's length to its height, the greater
the