Physics: 2D Projectile Motion Flashcards

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Questions and Answers

In the absence of air friction, the vertical component of a projectile's velocity doesn't change as the projectile moves.

False

A baseball is hurled into the air at an angle of 30 degrees above the horizontal. The baseball will also land on the target if it is thrown from an angle of:

60 degrees (correct)

20 degrees

40 degrees

50 degrees

After a rock that is thrown straight up reaches the top of its path and is starting to fall back down, its acceleration is:

Greater than when it was at the top of its path

Less than when it was at the top of its path

The same as when it was at the top of its path (correct)

Will a vector at 45 degrees to the horizontal be larger or smaller than its horizontal and vertical components? By how much?

Larger Signup and view all the answers

Why does a bowling ball move without acceleration when it rolls along a bowling alley?

No horizontal component of force; no acceleration in the horizontal direction, velocity is constant Signup and view all the answers

How should a person aim the arrow containing the food when the monkey drops from the tree at the same instant?

Aim it at the monkey Signup and view all the answers

Which of the following statements is true if an athlete throws a ball with a velocity of 40 m/s at an angle of 20 degrees above the horizontal?

Vertical component of the velocity changes sign after the ball attains its maximum height Signup and view all the answers

For general projectile motion, which statement is true when the projectile is at the initial and final points of the parabolic path?

Magnitude of the x/y components of its velocity are the same at both points Signup and view all the answers

When James drops straight down and John jumps with an initial horizontal velocity of 25 m/s into the lake below, which statement is true?

The splashdown speed of John is larger than that of James Signup and view all the answers

When Mary throws her snowball downward at 30 degrees below the horizontal and Debra throws her snowball upward at 30 degrees, which statement is true?

Debra's snowball will stay in the air longer than Mary's Signup and view all the answers

If the initial speed of a projectile is doubled, what happens to its range?

Its range will quadruple Signup and view all the answers

What is the term for change of velocity over time within circular motion, where the direction of acceleration is always towards the center?

Centripetal acceleration Signup and view all the answers

What is the name of the net force directed toward the center of a circle?

Centripetal force Signup and view all the answers

What does the term 'centripetal' refer to?

Center seeking Signup and view all the answers

What is instantaneous linear acceleration directed along the tangent to the object's circular path called?

Tangential acceleration Signup and view all the answers

What is the term for the 'center-fleeing' force that is not a real force?

Centrifugal force Signup and view all the answers

What is the rotational speed on a merry-go-round?

Same Signup and view all the answers

What is the tangential speed on a merry-go-round?

Person furthest out has greatest tangential speed Signup and view all the answers

Study Notes

2D Projectile Motion Key Concepts

The vertical component of a projectile's velocity is always affected by gravity; thus, it does not remain unchanged.
A baseball thrown at angles of 30 degrees and 60 degrees will land on the same target when thrown from the same height.

Acceleration and Velocity

A rock’s acceleration remains constant as it rises and falls, even at the peak of its trajectory.
The magnitude of horizontal and vertical components of velocity in general projectile motion is equal at the initial and final points of the path.

Forces in Motion

A rolling bowling ball maintains a constant velocity due to a lack of horizontal force.
In circular motion, centripetal acceleration always directs towards the center of the circular path, defining the object's movement along that path.

Projectile Launch and Aim

When aiming to feed a monkey dropping from a tree, a person should aim directly at the monkey to ensure success, as both will be affected by gravity simultaneously.

Comparative Motion

When James drops straight down and John jumps off the edge, John will splash down with a higher speed due to his initial horizontal velocity.
Snowballs thrown downward and upward at the same speed will have Mary’s snowball remain in the air longer than Debra’s.

Range and Speed Relationships

Doubling a projectile's initial speed results in quadrupling its range.
The centripetal force is the net force directed towards the center of the motion, such as friction or applied force.

Motion on a Merry-Go-Round

Rotational speed remains consistent for all individuals on a merry-go-round.
Individuals positioned farther from the center experience greater tangential speed, being the linear speed of an object along the circular path.

Additional Concepts

Tangential acceleration represents the instantaneous linear acceleration directed along the tangent to an object's circular path.
Centrifugal force, while not a real force, describes the sensation of being pushed outward due to an object’s inertia while moving in a circular path.

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Description

Test your knowledge of 2D projectile motion with these flashcards. This quiz covers key concepts such as the effects of gravity on projectile velocity and the dynamics of projectiles launched at angles. Perfect for students who want to reinforce their understanding of motion in physics.