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Questions and Answers
Which of the following characteristics of a graph indicates that a spring obeys Hooke's Law?
Which of the following characteristics of a graph indicates that a spring obeys Hooke's Law?
A spring can obey Hooke's Law for any amount of extension without limits.
A spring can obey Hooke's Law for any amount of extension without limits.
False
What is the limit of proportionality of the spring described in the content?
What is the limit of proportionality of the spring described in the content?
50 mm
The force per unit extension of the spring is denoted as k, where k = __________.
The force per unit extension of the spring is denoted as k, where k = __________.
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Match the following springs with their characteristics:
Match the following springs with their characteristics:
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What is the force exerted by support P on the floorboard?
What is the force exerted by support P on the floorboard?
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What can be inferred if the floorboard tips up when the workman stands on it?
What can be inferred if the floorboard tips up when the workman stands on it?
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The force exerted by support R can be equal to the force exerted by support Q.
The force exerted by support R can be equal to the force exerted by support Q.
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The total weight of the floorboard is ____ N.
The total weight of the floorboard is ____ N.
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Given the thickness of the supports, how thick is each support?
Given the thickness of the supports, how thick is each support?
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Match the supports with the correct forces they exert on the floorboard:
Match the supports with the correct forces they exert on the floorboard:
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What did the student notice about one of the results recorded for the spring?
What did the student notice about one of the results recorded for the spring?
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According to Hooke's Law, the extension of a spring is proportional to the _____ applied.
According to Hooke's Law, the extension of a spring is proportional to the _____ applied.
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Which statement correctly describes the relationship between force, mass, and acceleration?
Which statement correctly describes the relationship between force, mass, and acceleration?
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If no resultant force is acting on a moving object, it will continue to move with the same speed and in the same direction.
If no resultant force is acting on a moving object, it will continue to move with the same speed and in the same direction.
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What happens to the motion of an object if a resultant force acts in the opposite direction to its motion?
What happens to the motion of an object if a resultant force acts in the opposite direction to its motion?
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The equation that links acceleration (a), resultant force (F), and mass (m) is F = _____ × a.
The equation that links acceleration (a), resultant force (F), and mass (m) is F = _____ × a.
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How is the moment of a force calculated?
How is the moment of a force calculated?
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Given a 3.0 N load positioned at the 90 cm mark from the pivot at the center, what is the moment about the pivot?
Given a 3.0 N load positioned at the 90 cm mark from the pivot at the center, what is the moment about the pivot?
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What is the direction of the acceleration when a force is acting on an object?
What is the direction of the acceleration when a force is acting on an object?
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The position of the 2.0 N load is adjusted until the metre rule is again in equilibrium. The 2.0 N load is at the _____ cm mark.
The position of the 2.0 N load is adjusted until the metre rule is again in equilibrium. The 2.0 N load is at the _____ cm mark.
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Match the following terms with their definitions:
Match the following terms with their definitions:
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The weight of an object is equal to the mass times the acceleration due to gravity.
The weight of an object is equal to the mass times the acceleration due to gravity.
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What is the weight of a woman who has a mass of 60 kg on Earth? (Assume gravity = 9.81 m/s²)
What is the weight of a woman who has a mass of 60 kg on Earth? (Assume gravity = 9.81 m/s²)
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The force required to accelerate a 60 kg woman at 2.5 m/s² is ____________.
The force required to accelerate a 60 kg woman at 2.5 m/s² is ____________.
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Match the terms with their definitions:
Match the terms with their definitions:
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What is the name of point B on the extension-load graph where the spring no longer obeys Hooke's law?
What is the name of point B on the extension-load graph where the spring no longer obeys Hooke's law?
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If a spring has an unstretched length of 4.0 cm and stretches to 6.0 cm, what is the change in length?
If a spring has an unstretched length of 4.0 cm and stretches to 6.0 cm, what is the change in length?
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The law that describes the behavior of a spring from the origin to the limit of proportionality is known as ____________.
The law that describes the behavior of a spring from the origin to the limit of proportionality is known as ____________.
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Study Notes
Forces and Acceleration
- Two students made statements about acceleration. Student A stated that acceleration is proportional to the resultant force for a given mass. Student B stated that acceleration is proportional to the mass for a given force.
- Only one statement is correct. The incorrect statement needs to be rewritten. For a given force, the acceleration of an object is proportional to the inverse of its mass.
- The equation linking acceleration (a), resultant force (F), and mass (m) is: F = ma
Motion with No Resultant Force
- When there's no resultant force acting on a moving object, it will continue moving at a constant velocity. This means its speed and direction remain unchanged.
Moments
- A uniform metre rule is pivoted at its center of mass. Loads with weights are placed at specific marks on the rule.
- To calculate the moment of a force, multiply the force by the perpendicular distance from the pivot to the line of action of the force.
- The sum of clockwise moments about a pivot equals the sum of anticlockwise moments about the same pivot when a system is in equilibrium.
Equilibrium and Force
- For a system to be in equilibrium, the net force and net moment on the system must both be zero.
- When the net force acting on an object is zero, it's in equilibrium.
- When the net force is not zero, the object experiences acceleration.
Springs and Hooke's Law
- A student investigated how much a spring stretches when different weights are hung from it.
- The results were plotted on a graph of weight (force) versus extension. This graph should be linear to obey Hooke’s Law
- The graph shows the relationship (linear) between the force applied and the extension of the spring which means the spring obeys Hooke’s Law.
- A spring's limit of proportionality is the point where Hooke's Law (a constant force per unit extension) no longer applies, meaning the spring becomes nonlinear.
Acceleration and Force
- Force and acceleration are directly related. If there's a force, then there's an acceleration.
- The direction of the acceleration is in the same direction as the force that caused it.
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Description
Test your understanding of forces, acceleration, and moments in physics. This quiz explores the relationship between force, mass, and acceleration, as well as the behavior of objects in motion without resultant force. Can you identify correct statements regarding these concepts?
