Podcast
Questions and Answers
If an object starts from rest and undergoes uniform acceleration, what can be said about its velocity over time?
If an object starts from rest and undergoes uniform acceleration, what can be said about its velocity over time?
- It remains the same.
- It stays at zero.
- It decreases exponentially.
- It increases linearly. (correct)
What does 'uniformly accelerated motion' mean?
What does 'uniformly accelerated motion' mean?
- An object's velocity changes by equal amounts in equal time intervals. (correct)
- An object is moving with a decreasing acceleration.
- An object's acceleration changes at a constant rate.
- An object moves with a constant velocity.
At what axis in the cartesian coordinate system is horizontal motion usually compared?
At what axis in the cartesian coordinate system is horizontal motion usually compared?
- x-axis (correct)
- y-axis
- w-axis
- z-axis
What happens to the displacement of an object when the time of travel is doubled under uniform acceleration?
What happens to the displacement of an object when the time of travel is doubled under uniform acceleration?
Speed limits vary with the type of road and area. Which of the following statements is NOT TRUE about speed limit?
Speed limits vary with the type of road and area. Which of the following statements is NOT TRUE about speed limit?
If a freely falling object experiences uniform acceleration due to gravity, what is its velocity after 3 seconds? (Take g=9.8 m/s² and assume it starts from rest.)
If a freely falling object experiences uniform acceleration due to gravity, what is its velocity after 3 seconds? (Take g=9.8 m/s² and assume it starts from rest.)
Which of the following quantities remains constant in uniformly accelerated motion?
Which of the following quantities remains constant in uniformly accelerated motion?
Which of the following is NOT a characteristic of uniformly accelerated motion?
Which of the following is NOT a characteristic of uniformly accelerated motion?
What happens to the velocity of a ball as it is dropped off a cliff?
What happens to the velocity of a ball as it is dropped off a cliff?
Which of the following composed the two linear motions of a projectile?
Which of the following composed the two linear motions of a projectile?
What happens to the velocity of a vertically launched projectile as it ascends?
What happens to the velocity of a vertically launched projectile as it ascends?
If two identical balls are launched vertically with different initial velocities, which one will stay in the air longer?
If two identical balls are launched vertically with different initial velocities, which one will stay in the air longer?
At the peak of its motion, what is true about a projectile's velocity?
At the peak of its motion, what is true about a projectile's velocity?
Which of the following statements is correct about the time taken to ascend and descend for a projectile launched vertically?
Which of the following statements is correct about the time taken to ascend and descend for a projectile launched vertically?
Two projectiles are launched at the same speed but at different angles: one at 30° and the other at 60°. Assuming no air resistance, which of the following is true about their motion?
Two projectiles are launched at the same speed but at different angles: one at 30° and the other at 60°. Assuming no air resistance, which of the following is true about their motion?
If air resistance is considered, how will the projectile's motion be affected?
If air resistance is considered, how will the projectile's motion be affected?
What is the acceleration of a projectile in the horizontal direction (assuming no air resistance)?
What is the acceleration of a projectile in the horizontal direction (assuming no air resistance)?
In projectile motion, the horizontal and vertical motions are:
In projectile motion, the horizontal and vertical motions are:
A ball is dropped from rest at the same time another ball is launched horizontally. Which ball will hit the ground first (neglecting air resistance)?
A ball is dropped from rest at the same time another ball is launched horizontally. Which ball will hit the ground first (neglecting air resistance)?
At what point in its trajectory does a projectile have the smallest speed?
At what point in its trajectory does a projectile have the smallest speed?
How does the angle of release affect the maximum height of a projectile (assuming the same initial velocity)?
How does the angle of release affect the maximum height of a projectile (assuming the same initial velocity)?
What is the definition of momentum?
What is the definition of momentum?
How can an object's momentum be changed?
How can an object's momentum be changed?
What is impulse in physics?
What is impulse in physics?
Why does a person experience less force when landing with bent knees rather than stiff legs?
Why does a person experience less force when landing with bent knees rather than stiff legs?
What does the impulse-momentum theorem state?
What does the impulse-momentum theorem state?
Which of the following situations demonstrates the law of conservation of momentum?
Which of the following situations demonstrates the law of conservation of momentum?
If the time of impact during a collision is doubled, what happens to the force exerted?
If the time of impact during a collision is doubled, what happens to the force exerted?
A baseball player follows through with a swing when hitting the ball. How does this affect impulse?
A baseball player follows through with a swing when hitting the ball. How does this affect impulse?
According to the law of conservation of momentum, what happens when two objects collide in an isolated system?
According to the law of conservation of momentum, what happens when two objects collide in an isolated system?
Flashcards
Uniform Acceleration
Uniform Acceleration
Velocity increases linearly with time.
Uniformly Accelerated Motion
Uniformly Accelerated Motion
The acceleration remains constant.
X-axis
X-axis
The horizontal axis in a cartesian coordinate system.
Doubled Time, Uniform Acceleration
Doubled Time, Uniform Acceleration
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Horizontal Acceleration
Horizontal Acceleration
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Vertical Motion Independence
Vertical Motion Independence
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Velocity at Highest Point
Velocity at Highest Point
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Impulse-Momentum Theorem
Impulse-Momentum Theorem
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Study Notes
- When an object starts from rest and undergoes uniform acceleration, its velocity increases linearly over time.
- "Uniformly accelerated motion" means an object's velocity changes by equal amounts in equal time intervals.
- Horizontal motion is usually compared along the x-axis in the Cartesian coordinate system.
- When the time of travel is doubled under uniform acceleration, the displacement of an object quadruples.
- This is NOT TRUE about speed limits: It permits vehicles to move in uniformly accelerated motion.
- A freely falling object experiences uniform acceleration due to gravity, its velocity after 3 seconds is 29.4 m/s (assuming it starts from rest and using g = 9.8 m/s²).
- Acceleration remains constant in uniformly accelerated motion.
- This is NOT a characteristic of uniformly accelerated motion: The displacement-time graph is a straight line.
- As a ball is dropped off a cliff, its velocity increases at a uniform rate.
- Projectile motion is composed of horizontal and vertical motions.
- The velocity of a vertically launched projectile decreases until it reaches zero as it ascends.
- If two identical balls are launched vertically with different initial velocities, the one with the greater initial velocity will stay in the air longer.
- At the peak of its motion, a projectile has zero velocity.
- The time to ascend is equal to the time to descend for a projectile launched vertically.
- Two projectiles are launched at the same speed but at different angles (30° and 60°), assuming no air resistance, both projectiles will have the same range.
- If air resistance is considered, the projectile's motion will be affected such that it will have a lower final velocity than its initial velocity when returning.
- The acceleration of a projectile in the horizontal direction (assuming no air resistance) is 0 m/s².
- In projectile motion, the horizontal and vertical motions are independent of each other.
- A ball dropped from rest and another ball launched horizontally at the same time will both hit the ground at the same time (neglecting air resistance).
- A projectile has the smallest speed at the highest point in its trajectory.
- The greater the vertical component of velocity, the higher the projectile reaches.
- Momentum is defined as the product of mass and velocity.
- An object's momentum can be changed by applying a force over time.
- Impulse in physics is the product of force and time.
- A person experiences less force when landing with bent knees rather than stiff legs because bending the knees increases the time of impact, reducing the force.
- The impulse-momentum theorem states that the change in momentum of an object is equal to the impulse applied to it.
- A cannon recoiling backward when it fires a cannonball demonstrates the law of conservation of momentum.
- If the time of impact during a collision is doubled, the force exerted is reduced by half.
- A baseball player following through with a swing when hitting the ball increases impulse by increasing the time of contact.
- According to the law of conservation of momentum, the total momentum before and after the collision remains the same when two objects collide in an isolated system.
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