Podcast
Questions and Answers
How do you calculate the resultant force when two forces act in the same direction?
How do you calculate the resultant force when two forces act in the same direction?
- Multiply the magnitudes of the two forces
- Divide the magnitude of the larger force by the smaller force
- Subtract the smaller force from the larger force
- Add the magnitudes of the two forces together (correct)
What is the resultant force when a force of 5 N to the right is opposed by a force of 3 N to the left?
What is the resultant force when a force of 5 N to the right is opposed by a force of 3 N to the left?
- 2 N to the left
- 5 N to the right
- 8 N to the left
- 2 N to the right (correct)
In which scenario would a free body diagram be most appropriate?
In which scenario would a free body diagram be most appropriate?
- Representing a single scalar quantity
- Calculating the speed of an object
- Visualizing the path of an object
- Describing multiple forces acting on an object (correct)
What is the resultant force when two forces of 7 N and 4 N act in opposite directions?
What is the resultant force when two forces of 7 N and 4 N act in opposite directions?
How are vector quantities typically represented in calculations?
How are vector quantities typically represented in calculations?
Flashcards
Scalar Quantity
Scalar Quantity
A physical quantity that has only magnitude (size).
Magnitude
Magnitude
The size or amount of a physical quantity.
Adding Scalar Quantities
Adding Scalar Quantities
Adding scalar quantities involves simply adding their magnitudes.
Subtracting Scalar Quantities
Subtracting Scalar Quantities
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Vector Quantity
Vector Quantity
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Vector Direction
Vector Direction
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Calculating Vector Quantities
Calculating Vector Quantities
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Resultant Force
Resultant Force
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Free Body Diagram
Free Body Diagram
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Resolving Forces
Resolving Forces
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Forces in Same Direction
Forces in Same Direction
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Forces in Opposite Directions
Forces in Opposite Directions
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Study Notes
Scalar Quantities
- Scalar quantities only have magnitude.
- Examples include mass and temperature.
- To find the sum of scalar quantities, add their values.
- To find the difference between scalar quantities, subtract their values.
- Scalar quantities do not have a direction.
Vector Quantities
- Vector quantities have both magnitude and direction.
- Examples include force.
- The direction of a vector can be described verbally or shown with an arrow.
- The length of the arrow represents the vector's magnitude.
- Resultant force is the single force that would have the same effect as multiple forces acting together.
- To calculate resultant force of forces acting in a straight line:
- Forces in the same direction: add the magnitudes.
- Forces in opposite directions: subtract the magnitude of the smaller force from the larger force. This gives the magnitude of the resultant force, also indicating the direction.
Example Calculations
- Mass: A 75 kg climber carrying a 15 kg backpack has a total mass of 90 kg. (75 kg + 15 kg = 90 kg)
- Temperature: A room heated from 12°C to 21°C has an increase in temperature of 9°C. (21°C - 12°C = 9°C)
- **Force:**Two forces of 3 N and 2 N acting to the right result in a resultant force of 5 N to the right. (3 N + 2 N = 5 N)
- Force: Two forces of 5 N and 3 N acting in opposite directions result in a resultant force of 2 N to the right. (5 N - 3 N = 2 N)
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