Chapter 8 Test
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Last updated about 5 years ago
50 questions
2
What is the work that you do on a machine?
What is the work that you do on a machine?
2
Which of the following in the comparison of a machines's work output with the
work input?
Which of the following in the comparison of a machines's work output with the
work input?
2
Which equation would you use to find mechanical advantage?
Which equation would you use to find mechanical advantage?
2
In which situation is a person doing work on an object?
In which situation is a person doing work on an object?
2
If a barbell weighs 160 N, what other information do you need to calculate how
much work it takes to lift it?
If a barbell weighs 160 N, what other information do you need to calculate how
much work it takes to lift it?
2
How does a ramp make lifting a heavy object easier?
How does a ramp make lifting a heavy object easier?
2
If the work output of a machine is always less that the work input, where does
the missing work go?
If the work output of a machine is always less that the work input, where does
the missing work go?
2
Which of the following is NOT a wedge/
Which of the following is NOT a wedge/
2
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 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?
2
Which of the following machines always has a mechanical advantage of less than
1?
Which of the following machines always has a mechanical advantage of less than
1?
2
What is the rate at which power is transferred?
What is the rate at which power is transferred?
2
What do you call the number of times a machine multiplies force?
What do you call the number of times a machine multiplies force?
2
What is a machine that is made of two simple machines?
What is a machine that is made of two simple machines?
2
What is a machine with a grooved wheel that holds a cable?
What is a machine with a grooved wheel that holds a cable?
2
A moving object has what kind of energy?
A moving object has what kind of energy?
2
Which of the following would increase the mechanical advantage of a first-class
lever?
Which of the following would increase the mechanical advantage of a first-class
lever?
2
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?
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?
2
When a screwdriver is used as a lever to open a paint can, what is changed as
the work is done?
When a screwdriver is used as a lever to open a paint can, what is changed as
the work is done?
2
The mechanical advantage of a ________________ can be found by dividing the
radius of the wheel with the radius of the axle.
The mechanical advantage of a ________________ can be found by dividing the
radius of the wheel with the radius of the axle.
2
The greater the ration of the inclined plane's length to its height, the greater
the
The greater the ration of the inclined plane's length to its height, the greater
the
2
After you exert a force on an object, it then moves and has ___________ energy
After you exert a force on an object, it then moves and has ___________ energy
2
A ____________ lever places the load between the input force and the fulcrum.
A ____________ lever places the load between the input force and the fulcrum.
2
Second and third class levers do not change the direction of the __________
force
Second and third class levers do not change the direction of the __________
force
2
A __________ pulley is attached to something so it does not move.
A __________ pulley is attached to something so it does not move.
2
The mechanical advantage of a block and tackle pulley depends upon the number of
_______________________.
The mechanical advantage of a block and tackle pulley depends upon the number of
_______________________.
2
If you could unwind a screw, you would find to os actually a(n)
____________________?
If you could unwind a screw, you would find to os actually a(n)
____________________?
2
A block and tackle is an example of a(n) ___________________?
A block and tackle is an example of a(n) ___________________?
2
The work you do on a machine such as turning a screwdriver is called
_________________?
The work you do on a machine such as turning a screwdriver is called
_________________?
2
Because of friction, the _______________ of a machine is always less than 100
percent
Because of friction, the _______________ of a machine is always less than 100
percent
2
A bar that pivots on a fulcrum is called a(n)______________?
A bar that pivots on a fulcrum is called a(n)______________?
2
The SI unit equivalent to 1 Newton-meter is called a(n) ____________________?
The SI unit equivalent to 1 Newton-meter is called a(n) ____________________?
2
A moving bowling ball has ___________ energy?
A moving bowling ball has ___________ energy?
2
You need the same amount of __________ to raise a car up a cliff as to push it
up a hill.
You need the same amount of __________ to raise a car up a cliff as to push it
up a hill.
2
Friction is why __________________ machines aren't 100% efficient.
Friction is why __________________ machines aren't 100% efficient.
2
A machine that had 100% mechanical efficiency would be a(n) ________________?
A machine that had 100% mechanical efficiency would be a(n) ________________?
2
What is the main difference between the three classes of lever?
What is the main difference between the three classes of lever?
2
comparing a machine's work output with work input
comparing a machine's work output with work input
2
product of the output force and the distance through which it is exerted
product of the output force and the distance through which it is exerted
2
unit used to express power
unit used to express power
2
device that makes work easier by changing the size or direction of a force
device that makes work easier by changing the size or direction of a force
2
unit used to express work
unit used to express work
2
machine with two circular devices of different sizes
machine with two circular devices of different sizes
2
machine made of two or more simple machines
machine made of two or more simple machines
2
transfer of energy that causes an object to mover in the direction of the force
transfer of energy that causes an object to mover in the direction of the force
2
the rate at which energy is transferred
the rate at which energy is transferred
2
number of times a machine multiples force
number of times a machine multiples force
2
Explain why a pair of scissors is a compound machine.
Explain why a pair of scissors is a compound machine.
2
If a person holds a rock over his or her head, how much work is being performed
on the rock? Explain.
If a person holds a rock over his or her head, how much work is being performed
on the rock? Explain.
2
Pat is removing nails from a piece of wood with the claw end of hammer. What
type of simple machine is he using? Explain.
Pat is removing nails from a piece of wood with the claw end of hammer. What
type of simple machine is he using? Explain.
2
How do you find the mechanical advantage of a wedge
How do you find the mechanical advantage of a wedge