Podcast
Questions and Answers
What is the primary difference between scalar and vector quantities?
What is the primary difference between scalar and vector quantities?
- Scalars have direction, vectors do not.
- Vectors have magnitude and direction, scalars have only magnitude. (correct)
- Vectors are only used in physics, scalars are used in all sciences.
- Scalars are always positive, vectors can be negative.
An object falling from a height will have a constant velocity until it hits the ground.
An object falling from a height will have a constant velocity until it hits the ground.
False (B)
What is the acceleration of an object moving with a velocity of 14.5 m/s [S] from an initial velocity of 4.25 m/s [S] over 2.1 seconds?
What is the acceleration of an object moving with a velocity of 14.5 m/s [S] from an initial velocity of 4.25 m/s [S] over 2.1 seconds?
4.9 m/s² [S]
The distance an object travels is always __________ than or equal to its displacement.
The distance an object travels is always __________ than or equal to its displacement.
Match the following situations with the correct kinematic variable:
Match the following situations with the correct kinematic variable:
Which of the following statements best describes the relationship between average velocity and instantaneous velocity?
Which of the following statements best describes the relationship between average velocity and instantaneous velocity?
Relative velocity considers the motion of two or more objects with respect to each other.
Relative velocity considers the motion of two or more objects with respect to each other.
To calculate the speed of an object that travels 51 km in 3.75 hours, use the formula: speed = __________.
To calculate the speed of an object that travels 51 km in 3.75 hours, use the formula: speed = __________.
Flashcards
Acceleration
Acceleration
The change in velocity per unit of time.
Velocity
Velocity
The rate at which an object changes position over time.
Vector Quantity
Vector Quantity
A quantity that has both magnitude and direction.
Distance
Distance
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Scalar Quantity
Scalar Quantity
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Displacement
Displacement
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Average Velocity
Average Velocity
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Instantaneous Velocity
Instantaneous Velocity
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Study Notes
Physics Concepts
- History of physics with key advances
- Scientific Method
- Proportional Relationships
- Scalar vs. Vector Quantities
- Vector Addition (1-D and 2-D)
- Relative Velocities
- Aristotle vs. Galileo – Falling Objects
- Kinematic Variables
- Average vs. Constant vs. Instantaneous velocities
- d/t and v/t graphs
Calculations
- Object Dropped from Ladder: An object dropped from a ladder hits the ground in 0.75 seconds. Its height is 2.76 meters.
- Object Dropped from CN Tower: An object dropped from the CN Tower hits the ground in 10.6 seconds. Its height is 551 meters.
- Velocity at Impact (Question 1): The velocity of the object from the ladder, upon hitting the ground is 7.4 m/s.
- Velocity at Impact (Question 2): The velocity of the object from the CN tower, upon hitting the ground is 104 m/s.
- Path Calculation (15 km N, 36 km E): An object traveling 15 km North and 36 km East covers a total distance of 51 km. Its displacement is 39 km Northeast.
- Speed and Velocity (Question 4): If the trip in question 4 takes 3.75 hours, the speed is 13.6 km/hr and velocity is 10.4 km/hr (Northeast).
- Path Calculation (10 m W, 6 m N, 6 m E, 3 m S): An object traveling 10 m West, 6 m North, 6 m East, and 3 m South has a total distance covered of 25 meters. Its displacement is 5 meters NorthWest.
- Speed and Velocity (Question 6): If the trip in question 6 takes 2.5 seconds, the speed is 10 m/s and velocity is 2 m/s (NorthWest).
- Velocity Increase: An object with an initial velocity of 4.25 m/s South increases to 14.5 m/s South over 2.1 seconds. The acceleration is 4.9 m/s² South.
- Velocity to Zero: An object moving at 21.6 m/s East comes to a complete stop in 8.3 seconds. The acceleration is 2.6 m/s² West.
- Circular Motion (Constant Velocity): For an object moving in a circular path at a constant velocity of 6.25 m/s with a radius of 2.8 m its acceleration is 14 m/s².
- Circular Motion (Constant Velocity): For an object moving in a circular path at a constant velocity of 2.5 m/s with a radius of 1.1 m its acceleration is 5.7 m/s².
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