Simple Machines Assessment Mcfadden Pd1 15-16
Questions and Answers
- 1.
A slanted surface used to raise an object is ______________
- A.
An inclined plane
- B.
A screw
- C.
An effort ramp
- D.
An efficiency board
Correct Answer
A. An inclined planeExplanation
An inclined plane is a slanted surface that is used to raise an object. It allows for the object to be moved up or down with less force compared to lifting it straight up. This simple machine is commonly used in various applications, such as ramps, stairs, and even wheelchair access ramps. It reduces the amount of effort required to move an object vertically by increasing the distance over which the force is applied. Therefore, an inclined plane is the correct answer for this question.Rate this question:
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- 2.
A device that does work with only one movement and changes the size and direction of a force is __________________
- A.
A compound machine
- B.
A simple machine
- C.
An effort machine
- D.
A wedge
Correct Answer
B. A simple machineExplanation
A simple machine is a device that can perform work with only one movement and can change the size and direction of a force. It is a basic mechanical device that makes work easier by multiplying, redirecting, or changing the applied force. Examples of simple machines include levers, pulleys, inclined planes, screws, wedges, and wheels and axles. These machines have been used for centuries to accomplish various tasks and are the building blocks of more complex machines.Rate this question:
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- 3.
A bar that is free to pivot about a fixed point is a _____________
- A.
Lever
- B.
Wedge
- C.
Fulcrum
- D.
Ramp
Correct Answer
A. LeverExplanation
A bar that is free to pivot about a fixed point is called a lever. A lever is a simple machine that consists of a rigid object (in this case, the bar) and a fulcrum (the fixed point). By applying a force at one end of the lever, the object on the other end can be moved or lifted. The lever allows for the amplification or redirection of force, making it a useful tool in various applications.Rate this question:
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- 4.
The work output of a machine compared to the work input is the _________ of the machine.
- A.
Efficiency
- B.
Power
- C.
Effort
- D.
Resistance
Correct Answer
A. EfficiencyExplanation
Efficiency is the correct answer because it represents the ratio of the work output of a machine to the work input. It measures how effectively a machine converts input energy into useful output energy. A higher efficiency indicates that the machine is able to minimize energy losses and maximize useful work output. Power refers to the rate at which work is done, effort refers to the force applied to do work, and resistance refers to the opposition to the flow of current in an electrical circuit.Rate this question:
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- 5.
The amount by which a machine multiplies an effort force is called the _________
- A.
Resistance force
- B.
Efficiency
- C.
Fulcrum
- D.
Mechanical advantage
Correct Answer
D. Mechanical advantageExplanation
The correct answer is "mechanical advantage" because it refers to the amount by which a machine amplifies or multiplies the effort force applied to it. It is a measure of how much easier a machine makes it to do work, by reducing the amount of effort force required to overcome a resistance force. The mechanical advantage of a machine can be calculated by dividing the resistance force by the effort force.Rate this question:
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- 6.
Two inclined planes put together form a simple machine called _________________
- A.
A screw
- B.
A wedge
- C.
A lever
- D.
An incline plane
Correct Answer
B. A wedgeExplanation
A wedge is formed by putting two inclined planes together. It is a simple machine that is used to separate or lift objects. The shape of a wedge allows it to apply a concentrated force to a small area, making it easier to split or cut through materials. Examples of wedges include knives, axes, and doorstops.Rate this question:
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- 7.
An inclined plane wrapped around a cylindrical post is a
- A.
Screw
- B.
Wedge
- C.
Lever
- D.
Block and tackle
Correct Answer
A. ScrewExplanation
A screw is a type of inclined plane wrapped around a cylindrical post. When the screw is rotated, it moves along the inclined plane, allowing it to lift or hold objects in place. The threads on the screw create a spiral shape, which provides mechanical advantage and makes it easier to drive the screw into a material or to lift heavy loads. Therefore, the correct answer is screw.Rate this question:
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- 8.
Two or more simple machines working together is called ________________
- A.
A pulley
- B.
A compound machine
- C.
A wheel and axle
- D.
A lever
Correct Answer
B. A compound machineExplanation
A compound machine refers to the combination of two or more simple machines working together. It is a device that utilizes the mechanical advantage of multiple simple machines to perform a specific task. In this case, a compound machine can be formed by combining different simple machines such as pulleys, wheels and axles, and levers.Rate this question:
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- 9.
A lever with a mechanical advantage greater than 1 is used to _____________
- A.
Increase resistance distance
- B.
Change direction
- C.
Decrease effort force
- D.
Increase speed
Correct Answer
C. Decrease effort forceExplanation
A lever with a mechanical advantage greater than 1 is used to decrease effort force. This means that with the lever, less force is required to achieve the same amount of work compared to using just the effort force alone. The lever amplifies the force applied, making it easier to overcome resistance or lift heavy objects.Rate this question:
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- 10.
Three of the listed simple machines are basically the same. Choose the one that DOES NOT belong with the group.
- A.
Wedge
- B.
Lever
- C.
Pulley
- D.
Wheel and axle
Correct Answer
A. WedgeExplanation
The wedge is the only simple machine in the list that does not involve rotational motion. It is used for splitting or cutting objects by applying force in a linear direction, whereas the lever, pulley, and wheel and axle all involve rotational motion to transmit or amplify force.Rate this question:
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- 11.
A system of pulleys designed to reduce the effort force is called _________________
- A.
A simple pulley
- B.
A fixed pulley
- C.
A movable pulley
- D.
A block and tackle
Correct Answer
D. A block and tackleExplanation
A block and tackle is a system of pulleys designed to reduce the effort force. It consists of multiple pulleys, both fixed and movable, arranged in a way that allows for increased mechanical advantage. By distributing the load across multiple pulleys, the force required to lift or move heavy objects is reduced. This makes it easier for individuals to exert less effort while accomplishing tasks that require significant force.Rate this question:
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- 12.
Two simple machines that are part of a bicycle are _____________
- A.
An inclined plane and a wedge
- B.
An inclined plane and a lever
- C.
A gear and a wheel and axle
- D.
A wheel and axle and an inclined plane
Correct Answer
C. A gear and a wheel and axleExplanation
The correct answer is a gear and a wheel and axle. A gear is a simple machine that consists of toothed wheels that interlock to transmit force and motion. In a bicycle, gears are used to change the speed and torque of the wheels. A wheel and axle is another simple machine where a wheel is attached to a shaft or axle, allowing for the rotation of the wheel. In a bicycle, the wheels and axles allow for smooth movement and efficient transfer of power from the rider to the bike.Rate this question:
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- 13.
Which of the following groups of simple machines represent variations of the lever?
- A.
Pulley, inclined plane, and wedge
- B.
Pulley, wheel and axle
- C.
Pulley, wedge, and screw
- D.
Wedge, screw, and wheel and axle
Correct Answer
B. Pulley, wheel and axleExplanation
The pulley and the wheel and axle are variations of the lever because they both involve a rotating motion around a fixed point. In a pulley, a rope or chain is wrapped around a wheel, which allows for lifting or moving heavy objects with less force. In a wheel and axle, a wheel is attached to a rod or axle, and when force is applied to the wheel, it rotates around the axle, allowing for the movement of objects. Both of these simple machines use the principle of leverage to make tasks easier.Rate this question:
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- 14.
The MA of a single fixed pulley is always one because
- A.
The pulley changes only the direction of the effort force
- B.
The pulley changes only the size of the effort force
- C.
The pulley changes the size and direction of the effort force
- D.
The pulley changes only the speed at which the effort force is applied
Correct Answer
A. The pulley changes only the direction of the effort forceExplanation
The correct answer is "the pulley changes only the direction of the effort force." A single fixed pulley does not change the size, speed, or direction of the effort force. It only changes the direction of the force applied. The effort force required to lift an object with a single fixed pulley is the same as the weight of the object being lifted.Rate this question:
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- 15.
Which of the following CANNOT be done by a simple machine?
- A.
Change the direction of a force
- B.
Increase the amount of work being done
- C.
Decrease the time it takes to do the work
- D.
Transfer energy from one location to another
Correct Answer
B. Increase the amount of work being doneExplanation
A simple machine is a mechanical device that can change the direction of a force, decrease the time it takes to do work, and transfer energy from one location to another. However, it cannot increase the amount of work being done. This is because a machine can only transform or transfer energy, but it cannot create or add energy to a system. Therefore, increasing the amount of work being done would require additional energy input, which a simple machine cannot provide.Rate this question:
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- 16.
A machine that changes only the direction of a force has an MA of ______________
- A.
10
- B.
5
- C.
3
- D.
1
Correct Answer
D. 1Explanation
A machine that changes only the direction of a force has an MA of 1 because it does not change the magnitude of the force. The mechanical advantage (MA) is calculated by dividing the output force by the input force. In this case, since the machine only changes the direction of the force, the output force is the same as the input force. Therefore, the MA is 1, indicating that there is no mechanical advantage gained in terms of force amplification.Rate this question:
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- 17.
What is the IMA of the inclined plane below?IMA = Effort Distance/Resistance DistanceActual MA = Resistance Force/ Effort ForceW = FxDWin = Fe x DeWout = Fr x DrWin = WoutEfficiency = Wout/Win x 100
- A.
1
- B.
3
- C.
.33
- D.
5
Correct Answer
B. 3Explanation
The given equation for IMA (Ideal Mechanical Advantage) is IMA = Effort Distance/Resistance Distance. In this case, the equation is not provided, but based on the given information, it can be inferred that the IMA is equal to 3. This is because the equation for IMA is not given, but the equation for efficiency is given, which is Efficiency = Wout/Win x 100. Since the efficiency is not mentioned, it can be assumed that the system is ideal and the efficiency is 100%. Therefore, since the Win (input work) is equal to Wout (output work), the IMA is equal to 3.Rate this question:
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- 18.
What is the IMA for this pulley system?
- A.
0
- B.
2
- C.
4
- D.
6
Correct Answer
B. 2Explanation
The IMA (Ideal Mechanical Advantage) for a pulley system is the ratio of the output force to the input force. In this case, the IMA is 2, which means that the system can multiply the input force by a factor of 2. This is because the pulley system consists of two pulleys, which allows for a mechanical advantage of 2.Rate this question:
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- 19.
Which pulley system will require the greatest effort distance to raise the resistance force 1 meter?
- A.
System A
- B.
System B
- C.
The effort distance will be the same for both A and B
- D.
More information is needed
Correct Answer
B. System BExplanation
System B will require the greatest effort distance to raise the resistance force 1 meter. The effort distance is the distance over which the effort force is applied. In System B, the effort force is applied to a smaller radius pulley compared to System A. According to the principle of mechanical advantage, a smaller radius pulley requires a greater effort distance to raise the resistance force the same distance. Therefore, System B will require the greatest effort distance.Rate this question:
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- 20.
Which lever below is a first class lever?
- A.
Lever A
- B.
Lever B
- C.
Lever C
Correct Answer
A. Lever AExplanation
A first-class lever is a type of lever where the fulcrum is located between the effort and the load. In Lever A, the fulcrum is positioned between the effort and the load, making it a first-class lever. Lever B and Lever C do not have the fulcrum in the middle, so they are not first-class levers.Rate this question:
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- 21.
Which lever below is a second class lever?
- A.
Lever A
- B.
Lever B
- C.
Lever C
Correct Answer
B. Lever BExplanation
A second class lever is a lever where the load is located between the fulcrum and the effort. In the given options, Lever B is the only lever where the load is placed between the fulcrum and the effort. Therefore, Lever B is the second class lever.Rate this question:
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- 22.
Which lever below is a third class lever?
- A.
Lever A
- B.
Lever B
- C.
Lever C
Correct Answer
C. Lever CExplanation
Lever C is a third class lever because in a third class lever, the effort force is applied between the fulcrum and the load. In this case, Lever C has the fulcrum at one end, the load in the middle, and the effort force applied at the other end. Therefore, Lever C fits the definition of a third class lever.Rate this question:
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- 23.
Which lever below has the largest mechanical advantage? Lever A Lever B Lever C
- A.
Lever A
- B.
Lever B
- C.
Lever C
Correct Answer
A. Lever AExplanation
Lever A has the largest mechanical advantage because mechanical advantage is determined by the ratio of the output force to the input force. In this case, Lever A is the correct answer because it has the longest distance between the fulcrum and the point where the input force is applied, which results in a larger output force compared to the input force.Rate this question:
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- 24.
The ___________________ is an example of a second class lever.
- A.
Fishing pole
- B.
Wheel barrow
- C.
See saw
- D.
Hockey stick
Correct Answer
B. Wheel barrowExplanation
A second class lever is a type of lever where the load is situated between the fulcrum and the effort. In the case of a wheelbarrow, the fulcrum is the wheel, the effort is applied by the person pushing the handles, and the load is placed in the bin. When the person pushes down on the handles, the wheelbarrow pivots on the wheel, allowing the load to be lifted and moved. Therefore, the wheelbarrow is an example of a second class lever.Rate this question:
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- 25.
The _________________ is an example of a third class lever.
- A.
Fishing pole
- B.
Wheel barrow
- C.
Nut cracker
- D.
Block and tackle
Correct Answer
A. Fishing poleExplanation
A fishing pole is an example of a third class lever because the effort force (applied by the angler's hand) is located between the fulcrum (the point where the pole pivots) and the load (the fish or resistance being lifted). In a third class lever, the effort force is closer to the fulcrum than the load, resulting in increased speed and range of motion but decreased force. In the case of a fishing pole, the angler exerts a force on the pole closer to their hand, allowing them to cast the line further and with more precision.Rate this question:
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- 26.
Which lever below has the largest mechanical advantage?
- A.
Lever A
- B.
Lever B
- C.
Lever C
Correct Answer
B. Lever BExplanation
Lever B has the largest mechanical advantage because it has a longer distance between the fulcrum and the point where the input force is applied. A longer distance results in a greater mechanical advantage, meaning that less input force is required to overcome a larger output force.Rate this question:
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- 27.
What letter represents the resistance force?
- A.
A
- B.
B
- C.
C
- D.
D
- E.
E
Correct Answer
A. AExplanation
The letter A represents the resistance force.Rate this question:
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- 28.
What letter represents the effort distance?
- A.
A
- B.
B
- C.
C
- D.
D
- E.
E
Correct Answer
D. DExplanation
The letter D represents the effort distance.Rate this question:
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- 29.
If the effort distance of a first class lever is 0.10 meters and the effort force is 2.5 N, what is the work input of the simple machine? IMA = Effort Distance/Resistance DistanceActual MA = Resistance Force/ Effort ForceW = FxDWin = Fe x DeWout = Fr x DrEfficiency = Wout/Win x 100
- A.
25
- B.
2.5
- C.
0.25
- D.
0.025
Correct Answer
C. 0.25Explanation
The work input of the simple machine can be calculated using the formula W = F x D, where W is the work input, F is the effort force, and D is the effort distance. In this case, the effort force is given as 2.5 N and the effort distance is given as 0.10 meters. Plugging these values into the formula, we get W = 2.5 N x 0.10 m = 0.25 Nm. Therefore, the work input of the simple machine is 0.25 Nm.Rate this question:
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- 30.
The ideal mechanical advantage and the actual mechanical advantage will always be the same.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because the ideal mechanical advantage (IMA) and the actual mechanical advantage (AMA) are not always the same. The IMA is the theoretical advantage gained by using a machine, while the AMA is the actual advantage taking into account factors like friction and inefficiencies. In reality, machines are never 100% efficient, so the AMA is always less than the IMA. Therefore, the ideal mechanical advantage and the actual mechanical advantage will not always be the same.Rate this question:
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- 31.
The work input will always be larger than the work output of a simple machine with an actual mechanical advantage greater than 1.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because the work input of a simple machine with an actual mechanical advantage greater than 1 can be equal to or smaller than the work output. The actual mechanical advantage is calculated by dividing the output force by the input force, and it represents the ratio of the forces involved. If the output force is larger than the input force, the actual mechanical advantage will be greater than 1. However, this does not necessarily mean that the work input will always be larger than the work output. The work input depends on both the force and the distance over which the force is applied, while the work output depends on the force exerted by the machine and the distance it moves the load.Rate this question:
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- 32.
If the resistance force is 3.15 Newtons and the resistance distance is 0.85 meters, the work output will equal ______.IMA = Effort Distance/Resistance DistanceActual MA = Resistance Force/ Effort ForceW = FxDWin = Fe x DeWout = Fr x DrEfficiency = Wout/Win x 100
- A.
0.268
- B.
2.68
- C.
26.87
- D.
0.0268
Correct Answer
B. 2.68Explanation
The work output can be calculated using the formula Wout = Fr x Dr, where Fr is the resistance force and Dr is the resistance distance. In this case, the resistance force is given as 3.15 Newtons and the resistance distance is given as 0.85 meters. Plugging these values into the formula, we get Wout = 3.15 x 0.85 = 2.6775. Rounding this to two decimal places, the work output will be approximately 2.68.Rate this question:
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- 33.
The comparison between work output and work input is the ideal mechanical advantage.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because the comparison between work output and work input is the actual mechanical advantage, not the ideal mechanical advantage. The ideal mechanical advantage is calculated based on the physical dimensions of a machine, while the actual mechanical advantage takes into account factors such as friction and inefficiencies in the machine.Rate this question:
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- 34.
To increase the Mechanical Avantage of an inclined plane, you can
- A.
Increase the length and height by the same amount
- B.
Increase the length or decrease the height
- C.
Decrease the length or increase the height
- D.
Decrease the length and the height by the same amount
Correct Answer
B. Increase the length or decrease the heightExplanation
To increase the Mechanical Advantage of an inclined plane, you can either increase the length or decrease the height. This is because Mechanical Advantage is calculated by dividing the length of the inclined plane by its height. By increasing the length, the inclined plane becomes longer, allowing for a longer distance over which the force is applied, resulting in a greater Mechanical Advantage. On the other hand, by decreasing the height, the inclined plane becomes less steep, reducing the effort required to move an object along it, again resulting in a greater Mechanical Advantage.Rate this question:
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.JPG "What is the IMA for this pulley system?")
.JPG "Which pulley system will require the greatest effort distance to raise the resistance force 1 meter?")
.JPG "Which lever below is a first class lever?")
.JPG "Which lever below is a second class lever?")
.JPG "Which lever below is a third class lever?")
.JPG "Which lever below has the largest mechanical advantage? Lever A Lever B Lever C")
.JPG "Which lever below has the largest mechanical advantage?")
.JPG "What letter represents the resistance force?")
.JPG "What letter represents the effort distance?")
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Mar 21, 2023Quiz Edited by
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Nov 05, 2015Quiz Created by
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