Projectile Motion Concepts and Applications

Professor Dave explains projectile motion, highlighting the independence of horizontal and vertical motions. He uses examples like a cannonball and a rock thrown off a cliff to illustrate these concepts. The video covers how to split velocity into x and y components using trigonometry and solve for airtime and distance using kinematic equations. The tutorial concludes with a summary of the key points and a call to action for viewers.

What is projectile motion?

• Motion of an object moving only horizontally.

• Motion of an object moving only vertically.

• Motion of an object moving in both horizontal and vertical directions.

• Motion of an object at rest.

What shape represents the path of a projectile?

• Parabola

• Ellipse

• Straight line

• Circle

How are the horizontal and vertical motions of a projectile related?

• They are independent of each other.

• They are dependent on each other.

• They are directly proportional.

• They are inversely proportional.

If two marbles are dropped from the same height, one vertically and one with horizontal velocity, when will they hit the ground?

• They will never hit the ground.

• They will hit the ground at the same time.

• The one dropped vertically will hit first.

• The one with horizontal velocity will hit first.

In the example of the rock thrown from a cliff, what is the initial velocity of the rock?

• 7.36 meters per second

• 10 meters per second

• 4.25 meters per second

• 8.5 meters per second

At what angle is the rock thrown from the cliff?

• 60 degrees

• 45 degrees

• 30 degrees

• 90 degrees

What happens to the vertical velocity of the rock as it reaches the zenith?

• It decreases to zero.

• It becomes negative.

• It remains constant.

• It increases.

How do you find the horizontal and vertical components of the velocity vector?

• By using algebraic equations.

• By using trigonometric functions.

• By using the Pythagorean theorem.

• By using calculus.

How long is the rock in the air before it hits the ground?

• 4.97 seconds

• 3.5 seconds

• 5.5 seconds

• 6.2 seconds

How far from the edge of the cliff does the rock land?

• 25.4 meters

• 30.2 meters

• 36.6 meters

• 40.1 meters