Podcast
Questions and Answers
Explain why the horizontal and vertical motions of a projectile are considered independent of each other.
Explain why the horizontal and vertical motions of a projectile are considered independent of each other.
The horizontal motion is constant due to inertia, while the vertical motion is affected by gravity. These forces act independently.
Describe the relationship between the launch angle and the range of a projectile, assuming all other factors remain constant.
Describe the relationship between the launch angle and the range of a projectile, assuming all other factors remain constant.
For a given initial speed, the maximum range is achieved at a launch angle of 45 degrees.
Explain why a projectile launched horizontally will hit the ground at the same time as an object dropped vertically from the same height.
Explain why a projectile launched horizontally will hit the ground at the same time as an object dropped vertically from the same height.
Both objects experience the same vertical acceleration due to gravity. The horizontal motion of the projectile does not affect its vertical motion.
A projectile is launched upwards at an angle. Describe how its vertical velocity changes from the moment it is launched until it reaches its maximum height?
A projectile is launched upwards at an angle. Describe how its vertical velocity changes from the moment it is launched until it reaches its maximum height?
Neglecting air resistance, explain why the horizontal velocity of a projectile remains constant throughout its flight.
Neglecting air resistance, explain why the horizontal velocity of a projectile remains constant throughout its flight.
If air resistance is considered, how does it affect the range and maximum height of a projectile compared to the ideal scenario without air resistance?
If air resistance is considered, how does it affect the range and maximum height of a projectile compared to the ideal scenario without air resistance?
Describe the shape of the trajectory of a projectile launched at an angle, and explain why it follows this shape.
Describe the shape of the trajectory of a projectile launched at an angle, and explain why it follows this shape.
How does increasing the initial velocity of a projectile affect its time of flight, assuming the launch angle remains the same?
How does increasing the initial velocity of a projectile affect its time of flight, assuming the launch angle remains the same?
What is the primary difference between speed and velocity? Provide an example.
What is the primary difference between speed and velocity? Provide an example.
Explain the difference between average speed and instantaneous speed. Give a real-world example of when they might differ considerably.
Explain the difference between average speed and instantaneous speed. Give a real-world example of when they might differ considerably.
Describe the relationship between displacement and distance traveled. When are they equal, and when are they different?
Describe the relationship between displacement and distance traveled. When are they equal, and when are they different?
Explain the difference between uniform motion and uniformly accelerated motion.
Explain the difference between uniform motion and uniformly accelerated motion.
Describe what is meant by free fall and what assumptions are made when considering an object to be in free fall.
Describe what is meant by free fall and what assumptions are made when considering an object to be in free fall.
Explain why a feather falls slower than a stone in the presence of air, but they would fall at the same rate in a vacuum.
Explain why a feather falls slower than a stone in the presence of air, but they would fall at the same rate in a vacuum.
Two cars are travelling at the same speed. Car A is heading North, and Car B is heading South. Do they have the same velocity? Explain.
Two cars are travelling at the same speed. Car A is heading North, and Car B is heading South. Do they have the same velocity? Explain.
Explain the difference between a scalar and a vector quantity. Give an example of each.
Explain the difference between a scalar and a vector quantity. Give an example of each.
Describe what a speedometer measures in the car and what the other device is that measures distance.
Describe what a speedometer measures in the car and what the other device is that measures distance.
Suppose an object is thrown upwards and then falls back to the ground. Describe, and explain, what is happening to the objects's acceleration during the entire flight.
Suppose an object is thrown upwards and then falls back to the ground. Describe, and explain, what is happening to the objects's acceleration during the entire flight.
A car accelerates from rest to 20 m/s in 5 seconds. Calculate the car's acceleration, assuming it is constant.
A car accelerates from rest to 20 m/s in 5 seconds. Calculate the car's acceleration, assuming it is constant.
An object has constant, uniform acceleration. Describe what is happening to its velocity.
An object has constant, uniform acceleration. Describe what is happening to its velocity.
Flashcards
Projectile Motion
Projectile Motion
A motion composed of horizontal and vertical linear motions.
Projectile
Projectile
An object acted upon only by the force of gravity.
Trajectory
Trajectory
The curved path of an object in projectile motion.
Gravitational Force
Gravitational Force
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Acceleration
Acceleration
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Speedometer
Speedometer
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Uniformly Accelerated Motion (UAM)
Uniformly Accelerated Motion (UAM)
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Free-fall exhibits UAM
Free-fall exhibits UAM
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Study Notes
Projectile Motion
- Projectile motion is composed of horizontal and vertical linear motions.
- A projectile is an object solely acted upon by gravitational force.
- Trajectory is the path followed by an object under projectile motion.
- The trajectory of a projectile is described as a parabola.
Forces Affecting Motion
- Gravitational force keeps an object from reaching the ground.
- When you throw a baseball straight up, its vertical velocity at the highest point is 0 m/s.
- The acceleration of a baseball as it returns to the ground is -9.8 m/s².
- The vertical velocity of an object changes continuously as it travels through the air.
- The horizontal velocity of an object remains the same as it travels through the air.
Vertical Velocity
- If a stone is horizontally launched at a certain height, its vertical velocity as it reaches the ground gradually decreases.
Benefits of Sports
- Gaining weight and tiredness is not a benefit of sports; sports typically lower blood pressure, improve heart health, protect against chronic diseases, and improve memory and brain function.
Motor Vehicle Speed
- A speedometer measures the speed of a moving vehicle.
Uniformly Accelerated Motion (UAM)
- In a body exhibiting uniformly accelerated motion, acceleration is constant.
- Acceleration is constant in bodies experiencing uniformly accelerated motion (FACT).
- UAM is not exclusively observed along the horizontal line of action (BLUFF).
- Objects in free-fall exhibit uniformly accelerated motion (FACT).
- Velocity changes at a constant rate in UAM (FACT).
- An object in UAM does not have zero acceleration (BLUFF).
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