# Basic Biomechanics And Levers

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This quiz is designed to test basic knowledge over biomechanics and levers.

• 1.

### The Â­___________ is the point of pivot, which is also known as the axis of rotation.

Explanation
The fulcrum is the point of pivot or the axis of rotation in a system. It is the fixed point around which a lever or any other rotating object moves. In other words, it is the point where the lever or object is supported or balanced.

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• 2.

### The _______________ is the distance from the weight to the fulcrum.

Explanation
The lever arm, also known as the lever-arm, refers to the distance between the weight and the fulcrum in a lever system. It is an essential component in determining the mechanical advantage and effectiveness of the lever. By increasing or decreasing the lever arm, the force required to move the weight can be adjusted. Therefore, understanding and measuring the lever arm is crucial in analyzing and optimizing the efficiency of lever systems.

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• 3.

### A first order lever is like a __________, with the __________ between the in-force and the out-force.

Explanation
A first order lever is like a teeter-totter, with the fulcrum between the in-force and the out-force.

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• 4.

### In a third order lever, the ___________ is closer to the fulcrum.

Explanation
In a third order lever, the in-lever is closer to the fulcrum. This means that the input force is applied closer to the fulcrum than the output force. The in-lever refers to the part of the lever where the input force is applied, while the out-lever refers to the part where the output force is exerted. In this case, the in-lever is closer to the fulcrum, indicating that the input force has a mechanical advantage over the output force.

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• 5.

### In a second order lever, the ___________ is closer to the fulcrum.

Explanation
In a second order lever, the out-lever is closer to the fulcrum. This means that the part of the lever that is farther away from the fulcrum is called the out-lever. It is important to understand the different parts of a lever and their positions in order to properly analyze and utilize second order levers.

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• 6.

### The most common kind of lever in nature is __________.

Explanation
The most common kind of lever in nature is the third order lever. A third order lever has the effort applied between the fulcrum and the load. In this type of lever, the effort arm is shorter than the load arm, meaning that a small effort can move a larger load. Third order levers are commonly found in our body, such as when we lift objects with our arms or legs. They allow us to exert force and move heavy loads with relatively less effort.

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• 7.

### The _________ order lever is the least common in nature.

Explanation
The term "first" or "1st" refers to the initial or earliest position in a sequence or order. In nature, the order lever that is least common would be the one that occurs earliest or is found in the fewest instances. Therefore, the correct answer is "first" or "1st".

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• 8.

### The equation for the balance of a lever deals with the _______ and the ________ of the lever arm.

Explanation
The equation for the balance of a lever deals with the force applied to the lever arm and the length of the lever arm. The force refers to the amount of energy or strength applied to the lever, while the length represents the distance from the pivot point to the point where the force is applied. By understanding the relationship between force and length, and vice versa, one can calculate the balance or equilibrium of a lever system.

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• 9.

### The length of the lever arm is perpendicular to the __________.

Explanation
The length of the lever arm is perpendicular to the in-lever and in lever.

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• 10.

### The location of the fulcrum influences ___________ and __________.

Explanation
The location of the fulcrum influences the speed and power of a lever. When the fulcrum is closer to the load, it increases the speed at which the load can be moved, but decreases the amount of power that can be applied. Conversely, when the fulcrum is closer to the effort, it increases the power that can be applied, but decreases the speed at which the load can be moved. Therefore, the location of the fulcrum has a direct impact on both the speed and power of a lever.

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• 11.

### The _________ is perpendicular to the point of limb rotation.

Explanation
The lever arm, also known as the lever-arm, is a component that is perpendicular to the point of limb rotation. It is the distance between the axis of rotation and the point where the force is applied. This perpendicular distance determines the torque or rotational force exerted on the object. Therefore, the lever arm or lever-arm plays a crucial role in determining the effectiveness of the force applied and the resulting motion or rotation.

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• 12.

### The _____________ is the perpendicular distance from the point of bone rotation to the line of muscle action.

Explanation
The in-lever is the perpendicular distance from the point of bone rotation to the line of muscle action. This distance determines the torque or force exerted by the muscle on the bone. The in lever is important in understanding and analyzing the mechanics of movement and muscle function.

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• 13.

### The out-lever is from the point of rotation to the point at which ___________ is applied.

Explanation
The out-lever is from the point of rotation to the point at which force or torque is applied.

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• 14.

### As the velocity ratio __________, speed decreases.

Explanation
The given answer states that as the velocity ratio increases or gets larger, the speed decreases. This implies that there is an inverse relationship between the velocity ratio and speed. When the velocity ratio increases, it means that the output distance covered in a given time period is greater than the input distance. This indicates that the output speed is slower compared to the input speed, resulting in a decrease in speed.

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• 15.

### As the velocity ratio decreases, force _________.

Explanation
As the velocity ratio decreases, the force required to achieve the same amount of work decreases. This is because a lower velocity ratio means that less distance is covered per unit of time, resulting in a slower speed. With a slower speed, less force is needed to overcome resistance or inertia and achieve the desired result. Therefore, as the velocity ratio decreases, the force required also decreases.

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• 16.

### The velocity ratio is the length of the ___________ divided by the length of the __________.

Explanation
The velocity ratio is the length of the in-lever divided by the length of the out-lever.

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• 17.

### A limb designed for force will have a _______________ velocity ratio than a limb designed for speed.

Explanation
A limb designed for force will have a greater velocity ratio than a limb designed for speed. This means that for the same amount of input force, the limb designed for force will have a greater output force, allowing it to exert more force on an object. In contrast, a limb designed for speed will have a smaller velocity ratio, meaning that it can move at a faster speed with less force. Therefore, the limb designed for force will have a greater velocity ratio than the limb designed for speed.

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• 18.

### Greater __________ causes a slower speed.

Explanation
Greater mass causes a slower speed because according to Newton's second law of motion, the acceleration of an object is inversely proportional to its mass. This means that as the mass of an object increases, the force required to accelerate it also increases. Therefore, a greater mass requires a greater force to move it and results in a slower speed.

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• 19.

### Long lever arms sweep a ____________ distance, whereas short lever arms move a _____________ distance.

Explanation
Long lever arms have a greater distance to cover compared to short lever arms. Therefore, they sweep a greater distance. On the other hand, short lever arms have a shorter distance to cover, so they move a smaller distance. In summary, long lever arms have a greater sweep distance, while short lever arms have a smaller movement distance.

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• 20.

• 21.

### Unguligrades have the most speed because of an increased __________ or decreased ____________.

Explanation
Unguligrades have the most speed because of an increased out-lever or decreased in-lever. This means that their limbs are positioned in a way that creates a longer lever arm for their muscles to exert force, allowing for greater speed and efficiency in movement. The out-lever refers to the distance between the joint and the point of application of force, while the in-lever refers to the distance between the joint and the point of resistance. By increasing the out-lever or decreasing the in-lever, unguligrades can generate more force and achieve higher speeds.

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• 22.

### A distally inserted muscle is better for __________ movements

Explanation
A distally inserted muscle is better for strong, forceful movements because when a muscle is inserted distally (closer to the point of attachment), it allows for a greater mechanical advantage. This means that the muscle can exert more force and generate more strength when contracting. By being closer to the point of movement, the muscle can leverage its force more effectively, resulting in stronger and more forceful movements.

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• 23.

### A ____________ inserted muscle is better for speed.

Explanation
A muscle that is inserted proximally (closer to the origin of the muscle) allows for a greater range of motion and leverage, which is beneficial for generating speed. When a muscle is inserted proximally, it can contract more efficiently and generate more force, resulting in faster movements.

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• 24.

### The ____________ is an example of a low gear muscle.

Explanation
The hamstring is an example of a low gear muscle. This is because the hamstring is responsible for flexing the knee and extending the hip, movements that require a lot of force and power. Low gear muscles are typically larger, stronger muscles that generate a lot of force but have limited range of motion. The hamstring fits this description as it is a powerful muscle group located at the back of the thigh.

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• 25.

### The mechanism of levers means that the output force and the output speed are ___________.

Explanation
The mechanism of levers operates on the principle of balancing forces, where the input force and the output force are inversely proportional to their respective distances from the fulcrum. This means that when the output force is increased, the output speed decreases, and vice versa. Therefore, the output force and the output speed in the mechanism of levers are indeed opposites.

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• Current Version
• Mar 21, 2023
Quiz Edited by
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• Apr 21, 2009
Quiz Created by
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