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Questions and Answers
What type of object is not included in the items to bring in front of the camera?
What type of object is not included in the items to bring in front of the camera?
Which textbook is mentioned as part of the items to show to the camera?
Which textbook is mentioned as part of the items to show to the camera?
What physical concept is primarily addressed in the activity regarding the items brought to the camera?
What physical concept is primarily addressed in the activity regarding the items brought to the camera?
In the context of the activity, how should the students describe the steps they took to bring the items forward?
In the context of the activity, how should the students describe the steps they took to bring the items forward?
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What aspect of the movement of objects is questioned regarding the force exerted?
What aspect of the movement of objects is questioned regarding the force exerted?
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What is the mathematical representation of work done when a force is applied at an angle to the displacement?
What is the mathematical representation of work done when a force is applied at an angle to the displacement?
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Which of the following statements best describes when work is considered to be done?
Which of the following statements best describes when work is considered to be done?
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How many joules of work are done when a net force of 10 Newtons moves an object 2 meters?
How many joules of work are done when a net force of 10 Newtons moves an object 2 meters?
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Which factor does NOT affect the amount of work done on an object?
Which factor does NOT affect the amount of work done on an object?
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If a force of 15 Newtons is exerted at an angle of 60 degrees to move an object 5 meters, what is the work done?
If a force of 15 Newtons is exerted at an angle of 60 degrees to move an object 5 meters, what is the work done?
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In which of the following scenarios would no work be done?
In which of the following scenarios would no work be done?
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What is the unit used to measure work done in the International System of Units (SI)?
What is the unit used to measure work done in the International System of Units (SI)?
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The work-energy theorem states that work done on an object is equal to what?
The work-energy theorem states that work done on an object is equal to what?
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What is the relationship between force and displacement when performing positive work?
What is the relationship between force and displacement when performing positive work?
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If an object is being pushed while the angle between the applied force and the direction of motion is 100 degrees, what type of work is done?
If an object is being pushed while the angle between the applied force and the direction of motion is 100 degrees, what type of work is done?
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In the scenario where a 500 Newton force is applied to push a chair across a 7-meter aisle, what calculation would determine the work done?
In the scenario where a 500 Newton force is applied to push a chair across a 7-meter aisle, what calculation would determine the work done?
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During a pushing scenario of a 32-kg package with a 60-N force, how is the work done quantified?
During a pushing scenario of a 32-kg package with a 60-N force, how is the work done quantified?
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When carrying grocery bags while walking, what is the nature of the work done on the bags?
When carrying grocery bags while walking, what is the nature of the work done on the bags?
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If a 5-kilogram object is accelerating at 4 m/s² on a 30-degree inclined plane, how can the work done on the object be calculated?
If a 5-kilogram object is accelerating at 4 m/s² on a 30-degree inclined plane, how can the work done on the object be calculated?
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What role does friction play when pushing a heavy sled, given that it is negligible?
What role does friction play when pushing a heavy sled, given that it is negligible?
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To determine the work done when exerting a force of 3N at a 45-degree angle over 1 meter, which factor is crucial?
To determine the work done when exerting a force of 3N at a 45-degree angle over 1 meter, which factor is crucial?
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What condition results in zero work being done on a system?
What condition results in zero work being done on a system?
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In the scenario of an apple falling, what type of work is done by gravity?
In the scenario of an apple falling, what type of work is done by gravity?
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What does negative work indicate in relation to displacement?
What does negative work indicate in relation to displacement?
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What effect does air resistance have on the falling apple's kinetic energy?
What effect does air resistance have on the falling apple's kinetic energy?
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Which of the following forces is classified as a non-conservative force in the context of the falling apple?
Which of the following forces is classified as a non-conservative force in the context of the falling apple?
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If a force acts at 90 degrees to the direction of motion, what is the work done by that force?
If a force acts at 90 degrees to the direction of motion, what is the work done by that force?
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What happens to the apple's motion as air resistance increases?
What happens to the apple's motion as air resistance increases?
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Why is the gravitational force considered while analyzing the work done on the apple?
Why is the gravitational force considered while analyzing the work done on the apple?
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Study Notes
Work & Energy
- This presentation is for Grade 10 Physics students at Saint Jude Catholic School.
- The teachers are Mr. Jerome Morales and Mr. Carl Fermil Aguinaldo.
Activity
- Students are asked to bring random objects from home.
- The first student to show their object is awarded a recitation chip.
Bring Me Items
- Item #1: One Peso Coin
- Item #2: Pair of Socks
- Item #3: Physics Notebook
- Item #4: Chemistry Textbook (Glencoe)
- Item #5: Biology Textbook (Glencoe Biology) with Chemistry Textbook (Glencoe)
Processing Questions
- What have you noticed with the order of the items asked to bring to the camera?
- What are the steps you did to bring the books in front of the camera? (Be as detailed as possible.)
- Can you say that the force you exerted caused the items to be displaced from where they were to where they are now?
Learning Objectives
- Identify situations where work is done and where no work is done.
- Differentiate potential and kinetic energy and their practical applications.
- Identify and explain factors affecting potential and kinetic energy.
- Solve problems involving work and energy.
- State and explain the work-energy theorem and give examples for each.
The Work Concept
Work
- Work is a quantity resulting from a force causing movement over a distance.
- Mathematically, Work (W) = Force (F) × Displacement (d)
The Joule Unit
- One Joule (J) of work equals one Newton (N) of force applied to move an object one meter (m).
- 1 Joule = 1 Newton × 1 meter
The Parallel Condition
- Work is only done when the force applied is parallel to the direction of movement.
- If the object moves at an angle, only the component of displacement parallel to the force produces work.
- Work = Force × Displacement × cosine of the angle ( θ )
Work or No Work?
- Work is done when a force causes movement in the direction of the force.
Pushing a Table
- Pushing a table involves doing work.
Sitting Down
- Sitting down does not involve doing work.
Carrying Grocery Bags While Walking
- Carrying grocery bags while walking does not involve doing work (as long as there isn't a change in the height of the load).
Practice Problems (Examples)
- Suppose you push a chair with a 500 N force along a 7 m aisle. How much work is done?
- Suppose you apply a 60 N horizontal force to a 32 kg package, which pushes it 4 meters across a floor. How much work do you do on the package?
- Five football players push a 300 kg sled across the field. The sled is accelerating at 0.25 m/s² with negligible friction. What is the work done on the sled by the football player over 15.0 m of pushing?
- Determine the work done when you exert a force of 3 N at an angle of 45 degrees from the direction of motion for 1 m.
- A 5 kg object traveled 12 meters on an inclined plane at an angle of 30 degrees from the floor. If the object's acceleration is 4 m/s², what amount of work is done on the object?
Positive, Negative, and Zero Work
- Positive Work: The force and displacement are in the same direction (angle between them is less than 90°).
- Negative Work: The force and displacement are in opposite direction (angle between them is more than 90°).
- Zero Work: The force is perpendicular to the displacement (angle between them is 90°).
What Does a Negative Work Mean?
- Negative work indicates that the force is opposing the motion, potentially slowing it down, and reducing the kinetic energy of the object.
Example of Positive and Negative Work
- An apple falling from a tree experiences positive work from gravity.
- Air resistance acting on a falling apple causes negative work because the force of air resistance is opposite to the direction of the apple's displacement.
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Description
This quiz is designed for Grade 10 Physics students to explore the concepts of work and energy. Through engaging activities, students will bring items to illustrate these principles and discuss their observations. The goal is to identify situations where work is done and differentiate between potential and kinetic energy.
