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?
Galileo believed that heavier objects fall faster than lighter objects.
Galileo believed that heavier objects fall faster than lighter objects.
False
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].
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Match the following scenarios with the correct kinematic variable:
Match the following scenarios with the correct kinematic variable:
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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?
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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.
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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?
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Study Notes
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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Description
Test your knowledge on fundamental physics concepts including the history of physics, the scientific method, and kinematic variables. Solve problems related to free fall and vector addition to solidify your understanding of these topics.
