Podcast
Questions and Answers
What is the approximate height of an object that is dropped from the top of a ladder and takes 0.75 seconds to hit the ground?
What is the approximate height of an object that is dropped from the top of a ladder and takes 0.75 seconds to hit the ground?
- 4.0 m
- 2.76 m (correct)
- 1.5 m
- 3.6 m
Galileo believed that heavier objects fall faster than lighter objects.
Galileo believed that heavier objects fall faster than lighter objects.
False (B)
What is the term for velocities measured in a particular direction?
What is the term for velocities measured in a particular direction?
Vector quantities
The displacement of an object moving 10 m [W], 6 m [N], 6 m [E], and 3 m [S] is _____ m [NW].
The displacement of an object moving 10 m [W], 6 m [N], 6 m [E], and 3 m [S] is _____ m [NW].
Match the following scenarios with the correct kinematic variable:
Match the following scenarios with the correct kinematic variable:
An object moving in a circular path with a constant velocity of 6.25 m/s and a radius of 2.8 m has what acceleration?
An object moving in a circular path with a constant velocity of 6.25 m/s and a radius of 2.8 m has what acceleration?
When an object comes to a complete stop, its acceleration is always positive.
When an object comes to a complete stop, its acceleration is always positive.
If an object increases its velocity from 4.25 m/s to 14.5 m/s in 2.1 seconds, what is the acceleration?
If an object increases its velocity from 4.25 m/s to 14.5 m/s in 2.1 seconds, what is the acceleration?
Flashcards
What is Mechanics?
What is Mechanics?
The study of how objects move and their interactions with forces.
What is a scalar quantity?
What is a scalar quantity?
A quantity that only has magnitude.
What is a vector quantity?
What is a vector quantity?
A quantity that has both magnitude and direction.
What is displacement?
What is displacement?
The change in position of an object.
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What is velocity?
What is velocity?
The rate of change of displacement.
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What is acceleration?
What is acceleration?
The rate of change of velocity.
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What is average acceleration?
What is average acceleration?
The change in velocity over a period of time.
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What is instantaneous velocity?
What is instantaneous velocity?
The instantaneous velocity of an object at a specific moment.
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Concepts
- History of physics and 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, constant, and instantaneous velocities
- d/t and v/t graphs
Calculations
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Problem 1: An object falls from a ladder, hitting the ground in 0.75 seconds. Find the ladder's height.
- Solution: h = 2.76 meters
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Problem 2: An object falls from the CN Tower, hitting the ground in 10.6 seconds. Find the tower's height.
- Solution: h = 551 meters
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Problem 3a: Find the velocity of an object dropped from a ladder when it hits the ground.
- Solution: v = 7.4 m/s
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Problem 3b: Find the velocity of an object dropped from the CN Tower when it hits the ground.
- Solution: v = 104 m/s
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Problem 4: An object travels 15 km North and 36 km East. Calculate the distance and displacement.
- Solution: Distance = 51 km, Displacement = 39 km NE
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Problem 5: The trip in problem 4 takes 3.75 hours. Calculate the speed and velocity.
- Solution: Speed = 13.6 km/h, Velocity = 10.4 km/h NE
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Problem 6: An object travels 10 m West, 6 m North, 6 m East, and 3 m South. Calculate the distance and displacement.
- Solution: Distance = 25 m, Displacement = 5 m NW
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Problem 7: The trip in problem 6 takes 2.5 seconds. Calculate the speed and velocity.
- Solution: Speed = 10 m/s, Velocity = 2 m/s NW
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Problem 8: An object with a velocity of 4.25 m/s South increases its velocity to 14.5 m/s South over 2.1 seconds. Find the acceleration.
- Solution: a = 4.9 m/s² South
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Problem 9: An object with a velocity of 21.6 m/s East comes to a complete stop over 8.3 seconds. Find the acceleration.
- Solution: a = 2.6 m/s² West
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Problem 10: An object moves in a circular path with a constant velocity of 6.25 m/s and a radius of 2.8 meters. Find the acceleration.
- Solution: ac = 14 m/s²
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Problem 11: An object moves in a circular path with a constant velocity of 2.5 m/s and a radius of 1.1 meters. Find the acceleration.
- Solution: ac = 5.7 m/s²
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